Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ca-Mn-O”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.68 Å. Mn3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 13–47°. There are a spread of Mn–O bond distances ranging from 1.94–2.52 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three equivalent Mn3+ atoms. In the second O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ca2+ and four equivalent Mn3+ atoms. In the third O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Mn3+ atoms to form distorted corner-sharing OCa2Mn2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Mn2O7 by Materials Project

Ca4Mn2O7 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Ca2+ is bonded in a 6-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.95 Å. Mn3+ is bonded to five O2- atoms to form corner-sharing MnO5 square pyramids. There are a spread of Mn–O bond distances ranging from 1.88–2.08 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Ca2+ and two equivalent Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCa4Mn2 octahedra. In the second O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Mn3+ atoms to form distorted OCa2Mn2 tetrahedra that share corners with two equivalent OCa4Mn2 octahedra, corners with two equivalent OCa2Mn2 tetrahedra, and an edgeedge with one OCa4Mn2 octahedra. The corner-sharing octahedra tilt angles range from 18–79°. In the third O2- site, O2- is bonded in a 6-coordinate geometry to five equivalent Ca2+ and one Mn3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2MnO4 by Materials Project

Ca2MnO4 crystallizes in the tetragonal I4_1/acd space group. The structure is three-dimensional. Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.63 Å. Mn4+ is bonded to six O2- atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 25°. There is four shorter (1.90 Å) and two longer (1.97 Å) Mn–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to five equivalent Ca2+ and one Mn4+ atom to form a mixture of distorted edge and corner-sharing OCa5Mn octahedra. The corner-sharing octahedra tilt angles range from 0–6°. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with ten equivalent MnO5 square pyramids, edges with two equivalent CaO6 octahedra, and edges with two equivalent MnO5 square pyramids. There are a spread of Ca–O bond distances ranging from 2.38–2.43 Å. Mn3+ is bonded to five O2- atoms to form distorted MnO5 square pyramids that share corners with five equivalent CaO6 octahedra, corners with two equivalent MnO5 square pyramids, an edgeedge with one CaO6 octahedra, and edges with three equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 43–62°. There are a spread of Mn–O bond distances ranging from 1.94–2.23 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ca2+ and three equivalent Mn3+ atoms to form a mixture of edge and corner-sharing OCaMn3 trigonal pyramids. In the second O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Mn2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMnO2 by Materials Project

CaMnO2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent O2- atoms to form CaO6 octahedra that share corners with six equivalent MnO6 octahedra, edges with six equivalent CaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 3°. All Ca–O bond lengths are 2.37 Å. Mn2+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with six equivalent CaO6 octahedra, edges with six equivalent CaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 3°. All Mn–O bond lengths are 2.30 Å. O2- is bonded to three equivalent Ca2+ and three equivalent Mn2+ atoms to form a mixture of edge and corner-sharing OCa3Mn3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn4O8 by Materials Project

CaMn4O8 is beta indium sulfide-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.37–2.42 Å. There are two inequivalent Mn+3.50+ sites. In the first Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form edge-sharing MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.92–2.25 Å. In the second Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form edge-sharing MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.93–2.00 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Ca2+ and three Mn+3.50+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Mn+3.50+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mn+3.50+ atoms. In the fourth O2- site, O2- is bonded to one Ca2+ and three Mn+3.50+ atoms to form a mixture of distorted corner and edge-sharing OCaMn3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMnO2 by Materials Project

CaMnO2 is Caswellsilverite-like structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent O2- atoms to form CaO6 octahedra that share corners with six equivalent MnO6 octahedra, edges with six equivalent CaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 3°. All Ca–O bond lengths are 2.37 Å. Mn2+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with six equivalent CaO6 octahedra, edges with six equivalent CaO6 octahedra, and edges with six equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 3°. All Mn–O bond lengths are 2.30 Å. O2- is bonded to three equivalent Ca2+ and three equivalent Mn2+ atoms to form a mixture of corner and edge-sharing OCa3Mn3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Mn4O11 by Materials Project

Ca4Mn4O11 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are four inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.71 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.80 Å. In the third Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.74 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.57 Å. There are four inequivalent Mn+3.50+ sites. In the first Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent MnO6 octahedra and corners with four equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 22–29°. There are a spread of Mn–O bond distances ranging from 1.90–1.98 Å. In the second Mn+3.50+ site, Mn+3.50+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four equivalent MnO6 octahedra and a cornercorner with one MnO5 square pyramid. The corner-sharing octahedra tilt angles range from 16–34°. There are a spread of Mn–O bond distances ranging from 1.91–2.00 Å. In the third Mn+3.50+ site, Mn+3.50+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four equivalent MnO6 octahedra and a cornercorner with one MnO5 square pyramid. The corner-sharing octahedra tilt angles range from 24–31°. There are a spread of Mn–O bond distances ranging from 1.92–1.99 Å. In the fourth Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent MnO6 octahedra and corners with four equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 22–29°. There are a spread of Mn–O bond distances ranging from 1.90–2.02 Å. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two Mn+3.50+ atoms. In the second O2- site, O2- is bonded to three Ca2+ and two Mn+3.50+ atoms to form distorted OCa3Mn2 square pyramids that share corners with two equivalent OCa3Mn2 square pyramids and corners with two equivalent OCa2Mn2 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two Mn+3.50+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two Mn+3.50+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to three Ca2+ and two Mn+3.50+ atoms. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to three Ca2+ and two Mn+3.50+ atoms. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to three Ca2+ and two Mn+3.50+ atoms. In the eighth O2- site, O2- is bonded to two Ca2+ and two Mn+3.50+ atoms to form distorted corner-sharing OCa2Mn2 tetrahedra. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two Mn+3.50+ atoms. In the tenth O2- site, O2- is bonded in a 5-coordinate geometry to three Ca2+ and two Mn+3.50+ atoms. In the eleventh O2- site, O2- is bonded in a 5-coordinate geometry to three Ca2+ and two Mn+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMnO2 by Materials Project

CaMnO2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with four equivalent CaO6 octahedra, corners with eight equivalent MnO6 octahedra, edges with two equivalent MnO6 octahedra, edges with four equivalent CaO6 octahedra, and faces with two equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 42–52°. There are a spread of Ca–O bond distances ranging from 2.32–2.60 Å. Mn2+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four equivalent MnO6 octahedra, corners with eight equivalent CaO6 octahedra, edges with two equivalent CaO6 octahedra, edges with four equivalent MnO6 octahedra, and faces with two equivalent CaO6 octahedra. The corner-sharing octahedra tilt angles range from 42–51°. There are a spread of Mn–O bond distances ranging from 2.24–2.74 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to three equivalent Ca2+ and three equivalent Mn2+ atoms. In the second O2- site, O2- is bonded in a 6-coordinate geometry to three equivalent Ca2+ and three equivalent Mn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 is Spinel structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ca2+ is bonded to four O2- atoms to form CaO4 tetrahedra that share corners with twelve MnO6 octahedra. The corner-sharing octahedra tilt angles range from 54–74°. There are two shorter (2.23 Å) and two longer (2.24 Å) Ca–O bond lengths. There are two inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with six equivalent CaO4 tetrahedra and edges with six MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.94–2.42 Å. In the second Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with six equivalent CaO4 tetrahedra and edges with six MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.95–2.42 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCaMn3 trigonal pyramids. In the second O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCaMn3 trigonal pyramids. In the third O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCaMn3 trigonal pyramids. In the fourth O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form a mixture of distorted edge and corner-sharing OCaMn3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.27–2.65 Å. In the second Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.27–2.68 Å. There are four inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four MnO6 octahedra and edges with two equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 51–59°. There are a spread of Mn–O bond distances ranging from 1.95–2.13 Å. In the second Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO5 square pyramids and edges with four MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.97–2.26 Å. In the third Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO5 square pyramids and edges with four MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.97–2.26 Å. In the fourth Mn3+ site, Mn3+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four MnO6 octahedra and edges with two equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 51–59°. There are a spread of Mn–O bond distances ranging from 1.95–2.12 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Mn3+ atoms. In the second O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form distorted OCaMn3 tetrahedra that share corners with two equivalent OCa2Mn3 square pyramids, corners with two equivalent OCaMn3 tetrahedra, and edges with three OCa2Mn3 square pyramids. In the third O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form distorted OCaMn3 tetrahedra that share corners with two equivalent OCa2Mn3 square pyramids, corners with two equivalent OCaMn3 tetrahedra, and edges with three OCa2Mn3 square pyramids. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Mn3+ atoms. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Mn3+ atoms. In the sixth O2- site, O2- is bonded to two equivalent Ca2+ and three Mn3+ atoms to form distorted OCa2Mn3 square pyramids that share corners with two equivalent OCaMn3 tetrahedra, edges with four OCa2Mn3 square pyramids, and edges with three OCaMn3 tetrahedra. In the seventh O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Mn3+ atoms. In the eighth O2- site, O2- is bonded to two equivalent Ca2+ and three Mn3+ atoms to form distorted OCa2Mn3 square pyramids that share corners with two equivalent OCaMn3 tetrahedra, edges with four OCa2Mn3 square pyramids, and edges with three OCaMn3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O5 by Materials Project

CaMn2O5 crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.45–2.68 Å. Mn4+ is bonded to five O2- atoms to form a mixture of distorted edge and corner-sharing MnO5 trigonal bipyramids. There are a spread of Mn–O bond distances ranging from 1.74–1.99 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two equivalent Mn4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and three equivalent Mn4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca2+ and one Mn4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.28–2.67 Å. In the second Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.27–2.38 Å. There are four inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four MnO6 octahedra and edges with two equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 52–58°. There are a spread of Mn–O bond distances ranging from 1.95–2.14 Å. In the second Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO5 square pyramids and edges with four MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.98–2.31 Å. In the third Mn3+ site, Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO5 square pyramids and edges with four MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.98–2.26 Å. In the fourth Mn3+ site, Mn3+ is bonded to five O2- atoms to form MnO5 square pyramids that share corners with four MnO6 octahedra and edges with two equivalent MnO5 square pyramids. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Mn–O bond distances ranging from 1.94–2.14 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Mn3+ atoms. In the third O2- site, O2- is bonded to one Ca2+ and three Mn3+ atoms to form distorted OCaMn3 tetrahedra that share corners with two equivalent OCa2Mn3 square pyramids, corners with two equivalent OCaMn3 tetrahedra, and edges with three OCa2Mn3 square pyramids. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Mn3+ atoms. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Mn3+ atoms. In the sixth O2- site, O2- is bonded to two equivalent Ca2+ and three Mn3+ atoms to form distorted OCa2Mn3 square pyramids that share corners with two equivalent OCaMn3 tetrahedra, edges with four OCa2Mn3 square pyramids, and an edgeedge with one OCaMn3 tetrahedra. In the seventh O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Mn3+ atoms. In the eighth O2- site, O2- is bonded to two equivalent Ca2+ and three Mn3+ atoms to form distorted OCa2Mn3 square pyramids that share edges with four OCa2Mn3 square pyramids and edges with two equivalent OCaMn3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O4 by Materials Project

CaMn2O4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.40–2.55 Å. There are two inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 49–58°. There are a spread of Mn–O bond distances ranging from 1.96–2.15 Å. In the second Mn3+ site, Mn3+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 49–58°. There are a spread of Mn–O bond distances ranging from 1.95–2.19 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three equivalent Mn3+ atoms. In the second O2- site, O2- is bonded to two equivalent Ca2+ and three Mn3+ atoms to form a mixture of distorted corner and edge-sharing OCa2Mn3 trigonal bipyramids. In the third O2- site, O2- is bonded to two equivalent Ca2+ and three equivalent Mn3+ atoms to form a mixture of distorted corner and edge-sharing OCa2Mn3 square pyramids. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three Mn3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3Mn2O7 by Materials Project

Ca3Mn2O7 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.21–2.59 Å. In the second Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.85 Å. In the third Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.64 Å. There are two inequivalent Mn4+ sites. In the first Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 trigonal bipyramids. There are a spread of Mn–O bond distances ranging from 1.83–1.91 Å. In the second Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 square pyramids. There are a spread of Mn–O bond distances ranging from 1.84–1.93 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two Mn4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Mn4+ atoms. In the third O2- site, O2- is bonded to two Ca2+ and two Mn4+ atoms to form a mixture of distorted corner and edge-sharing OCa2Mn2 tetrahedra. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Mn4+ atom. In the fifth O2- site, O2- is bonded to four Ca2+ and one Mn4+ atom to form distorted OCa4Mn square pyramids that share corners with three OCa4Mn square pyramids, corners with two equivalent OCa2Mn2 tetrahedra, corners with two equivalent OCa4Mn trigonal bipyramids, edges with two equivalent OCa4Mn square pyramids, an edgeedge with one OCa2Mn2 tetrahedra, and edges with two equivalent OCa4Mn trigonal bipyramids. In the sixth O2- site, O2- is bonded to four Ca2+ and one Mn4+ atom to form distorted OCa4Mn trigonal bipyramids that share corners with three OCa4Mn square pyramids, corners with two equivalent OCa2Mn2 tetrahedra, corners with two equivalent OCa4Mn trigonal bipyramids, edges with four OCa4Mn square pyramids, and an edgeedge with one OCa2Mn2 tetrahedra. In the seventh O2- site, O2- is bonded to four Ca2+ and one Mn4+ atom to form distorted OCa4Mn square pyramids that share corners with three OCa4Mn square pyramids, a cornercorner with one OCa2Mn2 tetrahedra, a cornercorner with one OCa4Mn trigonal bipyramid, edges with two equivalent OCa4Mn square pyramids, an edgeedge with one OCa2Mn2 tetrahedra, and edges with two equivalent OCa4Mn trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMn2O5 by Materials Project

CaMn2O5 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ca–O bond distances ranging from 2.35–2.79 Å. In the second Ca2+ site, Ca2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ca–O bond distances ranging from 2.35–2.79 Å. There are four inequivalent Mn4+ sites. In the first Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 trigonal bipyramids. There are a spread of Mn–O bond distances ranging from 1.84–1.96 Å. In the second Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 square pyramids. There are a spread of Mn–O bond distances ranging from 1.86–1.97 Å. In the third Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 trigonal bipyramids. There are a spread of Mn–O bond distances ranging from 1.84–1.96 Å. In the fourth Mn4+ site, Mn4+ is bonded to five O2- atoms to form corner-sharing MnO5 square pyramids. There are a spread of Mn–O bond distances ranging from 1.85–1.96 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted see-saw-like geometry to two equivalent Ca2+ and two Mn4+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ca2+ and two Mn4+ atoms. In the third O2- site, O2- is bonded to two equivalent Ca2+ and two Mn4+ atoms to form distorted corner-sharing OCa2Mn2 tetrahedra. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ca2+ and two Mn4+ atoms. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ca2+ and two equivalent Mn4+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two equivalent Mn4+ atoms. In the seventh O2- site, O2- is bonded to two equivalent Ca2+ and two Mn4+ atoms to form distorted corner-sharing OCa2Mn2 tetrahedra. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ca2+ and two equivalent Mn4+ atoms. In the ninth O2- site, O2- is bonded in a distorted see-saw-like geometry to two equivalent Ca2+ and two Mn4+ atoms. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaMnO2 by Materials Project

CaMnO2 is Caswellsilverite-like structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with two equivalent CaO6 octahedra, corners with four MnO6 octahedra, edges with five MnO6 octahedra, and edges with seven CaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–3°. There are a spread of Ca–O bond distances ranging from 2.32–2.45 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with two equivalent CaO6 octahedra, corners with four MnO6 octahedra, edges with five MnO6 octahedra, and edges with seven CaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–4°. There are a spread of Ca–O bond distances ranging from 2.36–2.39 Å. There are two inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent MnO6 octahedra, corners with four CaO6 octahedra, edges with five CaO6 octahedra, and edges with seven MnO6 octahedra. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Mn–O bond distances ranging from 2.27–2.34 Å. In the second Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent MnO6 octahedra, corners with four CaO6 octahedra, edges with five CaO6 octahedra, and edges with seven MnO6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are a spread of Mn–O bond distances ranging from 2.21–2.35 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ca2+ and five Mn2+ atoms to form OCaMn5 octahedra that share corners with six OCa3Mn3 octahedra and edges with twelve OCaMn5 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the second O2- site, O2- is bonded to three equivalent Ca2+ and three Mn2+ atoms to form a mixture of edge and corner-sharing OCa3Mn3 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the third O2- site, O2- is bonded to three Ca2+ and three equivalent Mn2+ atoms to form a mixture of edge and corner-sharing OCa3Mn3 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. In the fourth O2- site, O2- is bonded to five Ca2+ and one Mn2+ atom to form a mixture of edge and corner-sharing OCa5Mn octahedra. The corner-sharing octahedra tilt angles range from 1–2°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2Mn2O5 by Materials Project

Ca2Mn2O5 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.87 Å. There are two inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four equivalent MnO6 octahedra and corners with two equivalent MnO4 tetrahedra. The corner-sharing octahedral tilt angles are 12°. There is four shorter (1.96 Å) and two longer (2.02 Å) Mn–O bond length. In the second Mn3+ site, Mn3+ is bonded to four O2- atoms to form MnO4 tetrahedra that share corners with two equivalent MnO6 octahedra and corners with two equivalent MnO4 tetrahedra. The corner-sharing octahedral tilt angles are 31°. There are a spread of Mn–O bond distances ranging from 1.94–2.05 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to four equivalent Ca2+ and two equivalent Mn3+ atoms. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ca2+ and two Mn3+ atoms. In the third O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Mn3+ atoms to form corner-sharing OCa2Mn2 tetrahedra.

36 MATERIALS SCIENCE↗