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DOE OSTI2020

Materials Data on Mn3Zn(FeO2)8 by Materials Project

Mn3Zn(FeO2)8 is Spinel-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are three inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to four O2- atoms to form MnO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedral tilt angles are 59°. All Mn–O bond lengths are 2.04 Å. In the second Mn2+ site, Mn2+ is bonded to four O2- atoms to form MnO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedra tilt angles range from 58–59°. There are one shorter (2.03 Å) and three longer (2.04 Å) Mn–O bond lengths. In the third Mn2+ site, Mn2+ is bonded to four O2- atoms to form MnO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedra tilt angles range from 58–59°. There are one shorter (2.02 Å) and three longer (2.06 Å) Mn–O bond lengths. There are four inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six MnO4 tetrahedra and edges with six FeO6 octahedra. All Fe–O bond lengths are 2.05 Å. In the second Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three equivalent MnO4 tetrahedra, corners with three equivalent ZnO4 tetrahedra, and edges with six FeO6 octahedra. There are three shorter (2.02 Å) and three longer (2.03 Å) Fe–O bond lengths. In the third Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent ZnO4 tetrahedra, corners with four MnO4 tetrahedra, and edges with six FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.04–2.06 Å. In the fourth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share a cornercorner with one ZnO4 tetrahedra, corners with five MnO4 tetrahedra, and edges with six FeO6 octahedra. There are two shorter (2.04 Å) and four longer (2.06 Å) Fe–O bond lengths. Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedra tilt angles range from 57–59°. There are one shorter (1.99 Å) and three longer (2.03 Å) Zn–O bond lengths. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form distorted OMnFe3 trigonal pyramids that share corners with twelve OMnFe3 trigonal pyramids and edges with three equivalent OZnFe3 trigonal pyramids. In the second O2- site, O2- is bonded to three equivalent Fe3+ and one Zn2+ atom to form a mixture of distorted edge and corner-sharing OZnFe3 trigonal pyramids. In the third O2- site, O2- is bonded to three Fe3+ and one Zn2+ atom to form distorted OZnFe3 trigonal pyramids that share corners with twelve OZnFe3 trigonal pyramids and edges with three OMnFe3 trigonal pyramids. In the fourth O2- site, O2- is bonded to one Mn2+ and three Fe3+ atoms to form distorted OMnFe3 trigonal pyramids that share corners with twelve OMnFe3 trigonal pyramids and edges with three OZnFe3 trigonal pyramids. In the fifth O2- site, O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form a mixture of distorted edge and corner-sharing OMnFe3 trigonal pyramids. In the sixth O2- site, O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form distorted OMnFe3 trigonal pyramids that share corners with twelve OZnFe3 trigonal pyramids and edges with three equivalent OMnFe3 trigonal pyramids. In the seventh O2- site, O2- is bonded to one Mn2+ and three Fe3+ atoms to form a mixture of distorted edge and corner-sharing OMnFe3 trigonal pyramids. In the eighth O2- site, O2- is bonded to one Mn2+ and three Fe3+ atoms to form distorted OMnFe3 trigonal pyramids that share corners with twelve OZnFe3 trigonal pyramids and edges with three OMnFe3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeO2 by Materials Project

FeO2 is Rutile-like structured and crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are eight inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Fe–O bond distances ranging from 1.94–2.05 Å. In the second Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Fe–O bond distances ranging from 1.93–2.00 Å. In the third Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Fe–O bond distances ranging from 1.94–1.97 Å. In the fourth Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedra tilt angles range from 49–50°. There are a spread of Fe–O bond distances ranging from 1.95–2.07 Å. In the fifth Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedra tilt angles range from 49–51°. There are a spread of Fe–O bond distances ranging from 1.90–1.95 Å. In the sixth Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Fe–O bond distances ranging from 1.95–1.99 Å. In the seventh Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Fe–O bond distances ranging from 1.94–2.05 Å. In the eighth Fe site, Fe is bonded to six O atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedra tilt angles range from 50–51°. There are a spread of Fe–O bond distances ranging from 1.94–2.15 Å. There are sixteen inequivalent O sites. In the first O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the second O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the third O site, O is bonded in a trigonal non-coplanar geometry to three Fe atoms. In the fourth O site, O is bonded in a trigonal planar geometry to three Fe atoms. In the fifth O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the sixth O site, O is bonded in a trigonal planar geometry to three Fe atoms. In the seventh O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the eighth O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the ninth O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the tenth O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the eleventh O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the twelfth O site, O is bonded in a distorted trigonal planar geometry to three Fe atoms. In the thirteenth O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the fourteenth O site, O is bonded in a trigonal planar geometry to three Fe atoms. In the fifteenth O site, O is bonded in a distorted trigonal non-coplanar geometry to three Fe atoms. In the sixteenth O site, O is bonded in a trigonal planar geometry to three Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb5(FeO2)3 by Materials Project

Rb5(FeO2)3 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. there are three inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded to four equivalent O2- atoms to form corner-sharing RbO4 tetrahedra. All Rb–O bond lengths are 2.92 Å. In the second Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Rb–O bond distances ranging from 2.85–3.27 Å. In the third Rb1+ site, Rb1+ is bonded in a 3-coordinate geometry to five O2- atoms. There are a spread of Rb–O bond distances ranging from 2.76–3.36 Å. There are two inequivalent Fe+2.33+ sites. In the first Fe+2.33+ site, Fe+2.33+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.88 Å) and two longer (1.94 Å) Fe–O bond length. In the second Fe+2.33+ site, Fe+2.33+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All Fe–O bond lengths are 1.91 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to four Rb1+ and two Fe+2.33+ atoms. In the second O2- site, O2- is bonded to five Rb1+ and one Fe+2.33+ atom to form a mixture of distorted edge and corner-sharing ORb5Fe octahedra. The corner-sharing octahedral tilt angles are 65°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ti(FeO2)3 by Materials Project

Ti(FeO2)3 is Ilmenite-like structured and crystallizes in the trigonal R3 space group. The structure is three-dimensional. Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with nine FeO6 octahedra, edges with three equivalent FeO6 octahedra, and a faceface with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 49–57°. There are three shorter (1.92 Å) and three longer (2.09 Å) Ti–O bond lengths. There are three inequivalent Fe+2.67+ sites. In the first Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form distorted FeO6 octahedra that share corners with three equivalent FeO6 octahedra, corners with six equivalent TiO6 octahedra, edges with three equivalent FeO6 octahedra, and a faceface with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 49–64°. There are three shorter (2.08 Å) and three longer (2.25 Å) Fe–O bond lengths. In the second Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three equivalent TiO6 octahedra, corners with six equivalent FeO6 octahedra, edges with three equivalent FeO6 octahedra, and a faceface with one TiO6 octahedra. The corner-sharing octahedra tilt angles range from 44–57°. There are three shorter (2.02 Å) and three longer (2.09 Å) Fe–O bond lengths. In the third Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with nine FeO6 octahedra, edges with three equivalent TiO6 octahedra, and a faceface with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 44–64°. There are three shorter (1.98 Å) and three longer (2.15 Å) Fe–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ti4+ and three Fe+2.67+ atoms to form a mixture of distorted edge and corner-sharing OTiFe3 trigonal pyramids. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to one Ti4+ and three Fe+2.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(FeO2)2 by Materials Project

Li(FeO2)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Li sites. In the first Li site, Li is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Li–O bond distances ranging from 2.01–2.48 Å. In the second Li site, Li is bonded to six O atoms to form distorted LiO6 octahedra that share corners with twelve FeO6 octahedra and faces with two FeO6 octahedra. The corner-sharing octahedra tilt angles range from 38–63°. There are a spread of Li–O bond distances ranging from 2.05–2.44 Å. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with four equivalent LiO6 octahedra and edges with six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 42–63°. There are a spread of Fe–O bond distances ranging from 1.93–2.14 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with four equivalent LiO6 octahedra and edges with six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 38–54°. There are a spread of Fe–O bond distances ranging from 1.91–1.96 Å. In the third Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent LiO6 octahedra, edges with six FeO6 octahedra, and a faceface with one LiO6 octahedra. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Fe–O bond distances ranging from 1.91–1.96 Å. In the fourth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent LiO6 octahedra, edges with six FeO6 octahedra, and a faceface with one LiO6 octahedra. The corner-sharing octahedra tilt angles range from 53–54°. There are a spread of Fe–O bond distances ranging from 1.94–2.14 Å. There are eight inequivalent O sites. In the first O site, O is bonded to two Li and three Fe atoms to form distorted OLi2Fe3 trigonal bipyramids that share corners with five OLiFe3 trigonal pyramids, edges with two equivalent OLi2Fe3 trigonal bipyramids, and edges with four OLiFe3 trigonal pyramids. In the second O site, O is bonded to one Li and three Fe atoms to form OLiFe3 trigonal pyramids that share corners with two OLi2Fe3 trigonal bipyramids, corners with five OLiFe3 trigonal pyramids, edges with two OLi2Fe3 trigonal bipyramids, and an edgeedge with one OLiFe3 trigonal pyramid. In the third O site, O is bonded to two Li and three Fe atoms to form distorted OLi2Fe3 trigonal bipyramids that share corners with five OLiFe3 trigonal pyramids, edges with two equivalent OLi2Fe3 trigonal bipyramids, and edges with four OLiFe3 trigonal pyramids. In the fourth O site, O is bonded to one Li and three Fe atoms to form OLiFe3 trigonal pyramids that share corners with two OLi2Fe3 trigonal bipyramids, corners with five OLiFe3 trigonal pyramids, edges with two OLi2Fe3 trigonal bipyramids, and an edgeedge with one OLiFe3 trigonal pyramid. In the fifth O site, O is bonded in a 5-coordinate geometry to two Li and three Fe atoms. In the sixth O site, O is bonded to one Li and three Fe atoms to form OLiFe3 trigonal pyramids that share corners with three OLi2Fe3 trigonal bipyramids, corners with five OLiFe3 trigonal pyramids, edges with two OLi2Fe3 trigonal bipyramids, and an edgeedge with one OLiFe3 trigonal pyramid. In the seventh O site, O is bonded to one Li and three Fe atoms to form OLiFe3 trigonal pyramids that share corners with three OLi2Fe3 trigonal bipyramids, corners with five OLiFe3 trigonal pyramids, edges with two OLi2Fe3 trigonal bipyramids, and an edgeedge with one OLiFe3 trigonal pyramid. In the eighth O site, O is bonded in a 5-coordinate geometry to two Li and three Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YbEu(FeO2)4 by Materials Project

YbEu(FeO2)4 is Aluminum carbonitride-derived structured and crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Yb2+ is bonded to six O2- atoms to form YbO6 octahedra that share corners with six FeO5 trigonal bipyramids, edges with two equivalent YbO6 octahedra, and edges with four equivalent EuO6 octahedra. There are two shorter (2.32 Å) and four longer (2.33 Å) Yb–O bond lengths. Eu2+ is bonded to six O2- atoms to form EuO6 octahedra that share corners with six FeO5 trigonal bipyramids, edges with two equivalent EuO6 octahedra, and edges with four equivalent YbO6 octahedra. There are four shorter (2.37 Å) and two longer (2.38 Å) Eu–O bond lengths. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to five O2- atoms to form FeO5 trigonal bipyramids that share a cornercorner with one YbO6 octahedra, corners with two equivalent EuO6 octahedra, corners with six FeO5 trigonal bipyramids, and edges with three FeO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 58–60°. There are a spread of Fe–O bond distances ranging from 1.86–2.13 Å. In the second Fe3+ site, Fe3+ is bonded to five O2- atoms to form FeO5 trigonal bipyramids that share a cornercorner with one EuO6 octahedra, corners with two equivalent YbO6 octahedra, corners with six FeO5 trigonal bipyramids, and edges with three FeO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 59–61°. There are a spread of Fe–O bond distances ranging from 1.85–2.17 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to one Yb2+, two equivalent Eu2+, and one Fe3+ atom to form distorted OYbEu2Fe tetrahedra that share corners with nine OYbEu2Fe tetrahedra, corners with four OFe4 trigonal pyramids, and edges with three OYbEu2Fe tetrahedra. In the second O2- site, O2- is bonded to two equivalent Yb2+, one Eu2+, and one Fe3+ atom to form distorted OYb2EuFe tetrahedra that share corners with nine OYbEu2Fe tetrahedra, corners with four OFe4 trigonal pyramids, and edges with three OYbEu2Fe tetrahedra. In the third O2- site, O2- is bonded to four Fe3+ atoms to form OFe4 trigonal pyramids that share corners with four OYbEu2Fe tetrahedra, corners with six OFe4 trigonal pyramids, and edges with three OFe4 trigonal pyramids. In the fourth O2- site, O2- is bonded to four Fe3+ atoms to form OFe4 trigonal pyramids that share corners with four OYbEu2Fe tetrahedra, corners with six OFe4 trigonal pyramids, and edges with three OFe4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(FeO2)2 by Materials Project

Li(FeO2)2 is Spinel-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Li sites. In the first Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, and edges with six FeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.09–2.17 Å. In the second Li site, Li is bonded to four O atoms to form LiO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–63°. There is one shorter (1.98 Å) and three longer (1.99 Å) Li–O bond length. In the third Li site, Li is bonded to four O atoms to form LiO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–63°. There are a spread of Li–O bond distances ranging from 1.97–2.00 Å. In the fourth Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, and edges with six FeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.10–2.19 Å. In the fifth Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, and edges with six FeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.09–2.16 Å. In the sixth Li site, Li is bonded to four O atoms to form LiO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 54–62°. There are a spread of Li–O bond distances ranging from 1.96–2.01 Å. In the seventh Li site, Li is bonded to four O atoms to form LiO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 54–64°. There is two shorter (1.96 Å) and two longer (1.97 Å) Li–O bond length. In the eighth Li site, Li is bonded to six O atoms to form LiO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, and edges with six FeO6 octahedra. There are a spread of Li–O bond distances ranging from 2.08–2.18 Å. There are sixteen inequivalent Fe sites. In the first Fe site, Fe is bonded to four O atoms to form FeO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–61°. There are a spread of Fe–O bond distances ranging from 1.91–1.97 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.95–2.10 Å. In the third Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.88–2.09 Å. In the fourth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.90–2.08 Å. In the fifth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.95–2.09 Å. In the sixth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.95–2.11 Å. In the seventh Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.87–2.08 Å. In the eighth Fe site, Fe is bonded to four O atoms to form FeO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–63°. There are a spread of Fe–O bond distances ranging from 1.91–1.95 Å. In the ninth Fe site, Fe is bonded to four O atoms to form FeO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–63°. There are a spread of Fe–O bond distances ranging from 1.92–1.97 Å. In the tenth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.87–2.06 Å. In the eleventh Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.89–2.10 Å. In the twelfth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.90–2.11 Å. In the thirteenth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.88–2.08 Å. In the fourteenth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.94–2.12 Å. In the fifteenth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with three LiO4 tetrahedra, corners with three FeO4 tetrahedra, edges with two LiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.89–2.07 Å. In the sixteenth Fe site, Fe is bonded to four O atoms to form FeO4 tetrahedra that share corners with three LiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 54–62°. There are a spread of Fe–O bond distances ranging from 1.92–1.97 Å. There are thirty-two inequivalent O sites. In the first O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the second O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the third O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the fourth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the fifth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the sixth O site, O is bonded to four Fe atoms to form a mixture of distorted edge and corner-sharing OFe4 trigonal pyramids. In the seventh O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the eighth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the ninth O site, O is bonded to one Li and three Fe atoms to form a mixture of distorted edge and corner-sharing OLiFe3 trigonal pyramids. In the tenth O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the eleventh O site, O is bonded in a distorted trigonal pyramidal geometry to four Fe atoms. In the twelfth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the thirteenth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the fourteenth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the fifteenth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the sixteenth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the seventeenth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the eighteenth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the nineteenth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the twentieth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the twenty-first O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the twenty-second O site, O is bonded to four Fe atoms to form a mixture of distorted edge and corner-sharing OFe4 trigonal pyramids. In the twenty-third O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the twenty-fourth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the twenty-fifth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the twenty-sixth O site, O is bonded to one Li and three Fe atoms to form a mixture of distorted edge and corner-sharing OLiFe3 trigonal pyramids. In the twenty-seventh O site, O is bonded to four Fe atoms to form a mixture of distorted edge and corner-sharing OFe4 trigonal pyramids. In the twenty-eighth O site, O is bonded to one Li and three Fe atoms to form a mixture of edge and corner-sharing OLiFe3 trigonal pyramids. In the twenty-ninth O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the thirtieth O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the thirty-first O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms. In the thirty-second O site, O is bonded in a rectangular see-saw-like geometry to two Li and two Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga(FeO2)2 by Materials Project

Ga(FeO2)2 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. there are two inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six equivalent FeO4 tetrahedra, edges with two equivalent FeO6 octahedra, and edges with four equivalent GaO6 octahedra. There are four shorter (2.07 Å) and two longer (2.16 Å) Fe–O bond lengths. In the second Fe+2.50+ site, Fe+2.50+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with six equivalent FeO6 octahedra and corners with six equivalent GaO6 octahedra. The corner-sharing octahedra tilt angles range from 56–58°. There is two shorter (1.92 Å) and two longer (1.96 Å) Fe–O bond length. Ga3+ is bonded to six O2- atoms to form GaO6 octahedra that share corners with six equivalent FeO4 tetrahedra, edges with two equivalent GaO6 octahedra, and edges with four equivalent FeO6 octahedra. All Ga–O bond lengths are 2.03 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to three Fe+2.50+ and one Ga3+ atom. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Fe+2.50+ and two equivalent Ga3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ti(FeO2)3 by Materials Project

Ti(FeO2)3 is beta indium sulfide-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one TiO6 octahedra, and edges with four FeO6 octahedra. There are a spread of Ti–O bond distances ranging from 1.80–2.29 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one TiO6 octahedra, and edges with three FeO6 octahedra. There are a spread of Ti–O bond distances ranging from 1.79–2.21 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six FeO4 tetrahedra, edges with two equivalent TiO6 octahedra, and edges with two FeO6 octahedra. There are a spread of Ti–O bond distances ranging from 1.86–2.10 Å. In the fourth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six FeO4 tetrahedra, edges with two equivalent TiO6 octahedra, and edges with two FeO6 octahedra. There are a spread of Ti–O bond distances ranging from 1.88–2.08 Å. There are twelve inequivalent Fe+2.67+ sites. In the first Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two TiO6 octahedra and corners with nine FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–60°. There are a spread of Fe–O bond distances ranging from 1.89–1.99 Å. In the second Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with five TiO6 octahedra and corners with five FeO6 octahedra. The corner-sharing octahedra tilt angles range from 48–66°. There are a spread of Fe–O bond distances ranging from 1.96–2.10 Å. In the third Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four FeO6 octahedra and corners with five TiO6 octahedra. The corner-sharing octahedra tilt angles range from 48–63°. There are a spread of Fe–O bond distances ranging from 1.86–2.01 Å. In the fourth Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four TiO6 octahedra and corners with seven FeO6 octahedra. The corner-sharing octahedra tilt angles range from 47–63°. There are a spread of Fe–O bond distances ranging from 1.86–1.99 Å. In the fifth Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four TiO6 octahedra and corners with five FeO6 octahedra. The corner-sharing octahedra tilt angles range from 50–62°. There are a spread of Fe–O bond distances ranging from 1.93–2.13 Å. In the sixth Fe+2.67+ site, Fe+2.67+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four TiO6 octahedra and corners with six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 53–60°. There are a spread of Fe–O bond distances ranging from 1.89–2.01 Å. In the seventh Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one FeO6 octahedra, and edges with three TiO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.99–2.24 Å. In the eighth Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, edges with two TiO6 octahedra, and edges with three FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.96–2.16 Å. In the ninth Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one TiO6 octahedra, and edges with five FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.01–2.12 Å. In the tenth Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one TiO6 octahedra, and edges with five FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.11–2.18 Å. In the eleventh Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one FeO6 octahedra, and edges with three TiO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.91–2.10 Å. In the twelfth Fe+2.67+ site, Fe+2.67+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six FeO4 tetrahedra, an edgeedge with one TiO6 octahedra, and edges with five FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.99–2.11 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to four Fe+2.67+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Fe+2.67+ atom. In the fourth O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Fe+2.67+ atoms. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Ti4+ and two Fe+2.67+ atoms. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Ti4+ and two Fe+2.67+ atoms. In the seventh O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Fe+2.67+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the tenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Fe+2.67+ atoms. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Fe+2.67+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+ and two Fe+2.67+ atoms. In the thirteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Fe+2.67+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Ti4+ and one Fe+2.67+ atom. In the sixteenth O2- site, O2- is bonded in a distorted trigonal pyramidal geometry to one Ti4+ and three Fe+2.67+ atoms. In the seventeenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ti4+ and three Fe+2.67+ atoms. In the eighteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Ti4+ and two Fe+2.67+ atoms. In the nineteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ti4+ and three Fe+2.67+ atoms. In the twentieth O2- site, O2- is bonded in a trigonal planar geometry to three Fe+2.67+ atoms. In the twenty-first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ti4+ and three Fe+2.67+ atoms. In the twenty-third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms. In the twenty-fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two Fe+2.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrCa2(FeO2)3 by Materials Project

SrCa2(FeO2)3 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Sr2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Sr–O bond lengths are 2.67 Å. Ca2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.57 Å) and four longer (2.58 Å) Ca–O bond lengths. There are two inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded in a rectangular see-saw-like geometry to four equivalent O2- atoms. All Fe–O bond lengths are 2.01 Å. In the second Fe2+ site, Fe2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Fe–O bond lengths are 2.01 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Sr2+, two equivalent Ca2+, and two equivalent Fe2+ atoms to form a mixture of distorted edge, face, and corner-sharing OSr2Ca2Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–67°. In the second O2- site, O2- is bonded to four equivalent Ca2+ and two equivalent Fe2+ atoms to form OCa4Fe2 octahedra that share corners with fourteen OSr2Ca2Fe2 octahedra, edges with four OSr2Ca2Fe2 octahedra, and faces with four equivalent OCa4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–67°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(FeO2)2 by Materials Project

Li(FeO2)2 is Spinel-like structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent Li sites. In the first Li site, Li is bonded to four O atoms to form LiO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedra tilt angles range from 55–65°. There are a spread of Li–O bond distances ranging from 1.95–1.97 Å. In the second Li site, Li is bonded to four O atoms to form distorted LiO4 tetrahedra that share corners with six FeO6 octahedra and edges with three FeO6 octahedra. The corner-sharing octahedra tilt angles range from 60–65°. There are a spread of Li–O bond distances ranging from 1.77–1.96 Å. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four LiO4 tetrahedra, edges with five FeO6 octahedra, and an edgeedge with one LiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 49–50°. There are a spread of Fe–O bond distances ranging from 1.91–1.98 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with six FeO6 octahedra, corners with six LiO4 tetrahedra, and edges with three FeO6 octahedra. The corner-sharing octahedra tilt angles range from 49–52°. There are a spread of Fe–O bond distances ranging from 1.99–2.05 Å. In the third Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four LiO4 tetrahedra, edges with five FeO6 octahedra, and an edgeedge with one LiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Fe–O bond distances ranging from 1.94–2.06 Å. In the fourth Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four LiO4 tetrahedra, edges with five FeO6 octahedra, and an edgeedge with one LiO4 tetrahedra. The corner-sharing octahedral tilt angles are 52°. There are a spread of Fe–O bond distances ranging from 1.96–2.06 Å. There are eight inequivalent O sites. In the first O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the second O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the third O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the fourth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the fifth O site, O is bonded to one Li and three Fe atoms to form distorted corner-sharing OLiFe3 tetrahedra. In the sixth O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms. In the seventh O site, O is bonded in a distorted rectangular see-saw-like geometry to one Li and three Fe atoms. In the eighth O site, O is bonded to one Li and three Fe atoms to form distorted corner-sharing OLiFe3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiCr(FeO2)4 by Materials Project

LiCr(FeO2)4 is Spinel-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six equivalent FeO4 tetrahedra, edges with two equivalent CrO6 octahedra, and edges with four equivalent FeO6 octahedra. All Li–O bond lengths are 2.11 Å. Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six equivalent FeO4 tetrahedra, edges with two equivalent LiO6 octahedra, and edges with four equivalent FeO6 octahedra. There are four shorter (2.03 Å) and two longer (2.05 Å) Cr–O bond lengths. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent LiO6 octahedra, corners with three equivalent CrO6 octahedra, and corners with six equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There is three shorter (1.91 Å) and one longer (1.98 Å) Fe–O bond length. In the second Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six equivalent FeO4 tetrahedra, edges with two equivalent LiO6 octahedra, edges with two equivalent CrO6 octahedra, and edges with two equivalent FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.03–2.08 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Cr3+ and three Fe3+ atoms. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Li1+ and three Fe3+ atoms. In the third O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Li1+, one Cr3+, and two Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(FeO2)2 by Materials Project

Li(FeO2)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Li is bonded to six O atoms to form LiO6 octahedra that share corners with six equivalent FeO6 octahedra, edges with two equivalent LiO6 octahedra, and edges with six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 9–12°. There are a spread of Li–O bond distances ranging from 2.13–2.31 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share edges with four equivalent LiO6 octahedra and edges with six FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.89–2.11 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with six equivalent LiO6 octahedra, edges with two equivalent LiO6 octahedra, and edges with six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 9–12°. There are a spread of Fe–O bond distances ranging from 2.04–2.08 Å. There are two inequivalent O sites. In the first O site, O is bonded to two equivalent Li and three Fe atoms to form a mixture of corner and edge-sharing OLi2Fe3 square pyramids. In the second O site, O is bonded in a rectangular see-saw-like geometry to one Li and three Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgZn(FeO2)4 by Materials Project

MgZn(FeO2)4 is Spinel-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with three equivalent FeO4 tetrahedra, corners with three equivalent ZnO4 tetrahedra, and edges with six equivalent FeO6 octahedra. There are three shorter (2.06 Å) and three longer (2.12 Å) Mg–O bond lengths. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three equivalent FeO4 tetrahedra, corners with three equivalent ZnO4 tetrahedra, edges with two equivalent MgO6 octahedra, and edges with four equivalent FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.01–2.09 Å. In the second Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent MgO6 octahedra and corners with nine equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 57–58°. There is three shorter (1.90 Å) and one longer (2.02 Å) Fe–O bond length. Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with three equivalent MgO6 octahedra and corners with nine equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 57–59°. There are three shorter (1.98 Å) and one longer (2.02 Å) Zn–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Fe3+ and one Zn2+ atom. In the second O2- site, O2- is bonded to one Mg2+, two equivalent Fe3+, and one Zn2+ atom to form a mixture of distorted edge and corner-sharing OMgZnFe2 trigonal pyramids. In the third O2- site, O2- is bonded to four Fe3+ atoms to form distorted corner-sharing OFe4 trigonal pyramids. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Mg2+ and three Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnZn(FeO2)4 by Materials Project

MnZn(FeO2)4 is Spinel-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Mn2+ is bonded to four equivalent O2- atoms to form MnO4 tetrahedra that share corners with twelve equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 59°. All Mn–O bond lengths are 2.04 Å. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three equivalent MnO4 tetrahedra, corners with three equivalent ZnO4 tetrahedra, and edges with six equivalent FeO6 octahedra. There are three shorter (2.04 Å) and three longer (2.06 Å) Fe–O bond lengths. Zn2+ is bonded to four equivalent O2- atoms to form ZnO4 tetrahedra that share corners with twelve equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Zn–O bond lengths are 2.01 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form a mixture of distorted edge and corner-sharing OMnFe3 trigonal pyramids. In the second O2- site, O2- is bonded to three equivalent Fe3+ and one Zn2+ atom to form distorted OZnFe3 trigonal pyramids that share corners with twelve OMnFe3 trigonal pyramids and edges with three equivalent OZnFe3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr4Ca(FeO2)5 by Materials Project

Sr4Ca(FeO2)5 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.66 Å) and four longer (2.68 Å) Sr–O bond lengths. In the second Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight O2- atoms. All Sr–O bond lengths are 2.66 Å. Ca2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ca–O bond lengths are 2.62 Å. There are three inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are two shorter (2.02 Å) and two longer (2.04 Å) Fe–O bond lengths. In the second Fe2+ site, Fe2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. All Fe–O bond lengths are 2.03 Å. In the third Fe2+ site, Fe2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Fe–O bond lengths are 2.03 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four Sr2+ and two Fe2+ atoms to form a mixture of edge, corner, and face-sharing OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°. In the second O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Fe2+ atoms to form a mixture of edge, corner, and face-sharing OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°. In the third O2- site, O2- is bonded to two equivalent Sr2+, two equivalent Ca2+, and two Fe2+ atoms to form a mixture of distorted edge, corner, and face-sharing OSr2Ca2Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn(FeO2)2 by Materials Project

MnFe2O4 is Spinel structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mn2+ is bonded to four equivalent O2- atoms to form MnO4 tetrahedra that share corners with twelve equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 59°. All Mn–O bond lengths are 2.09 Å. Fe3+ is bonded to six equivalent O2- atoms to form FeO6 octahedra that share corners with six equivalent MnO4 tetrahedra and edges with six equivalent FeO6 octahedra. All Fe–O bond lengths are 2.06 Å. O2- is bonded to one Mn2+ and three equivalent Fe3+ atoms to form a mixture of distorted edge and corner-sharing OMnFe3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaCa(FeO2)4 by Materials Project

BaCaFe4O8 crystallizes in the trigonal P-31m space group. The structure is three-dimensional. Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share edges with six equivalent BaO12 cuboctahedra, edges with twelve equivalent FeO4 tetrahedra, and faces with two equivalent CaO6 octahedra. There are six shorter (3.00 Å) and six longer (3.19 Å) Ba–O bond lengths. Ca2+ is bonded to six equivalent O2- atoms to form CaO6 octahedra that share corners with twelve equivalent FeO4 tetrahedra and faces with two equivalent BaO12 cuboctahedra. All Ca–O bond lengths are 2.38 Å. Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with three equivalent CaO6 octahedra, corners with four equivalent FeO4 tetrahedra, and edges with three equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 57°. There is one shorter (1.88 Å) and three longer (1.91 Å) Fe–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, one Ca2+, and two equivalent Fe3+ atoms. In the second O2- site, O2- is bonded in a linear geometry to three equivalent Ba2+ and two equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗