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DOE OSTI2020

Materials Data on Ca2Al2O5 by Materials Project

Ca2Al2O5 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 2.33–2.81 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with four equivalent AlO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 9°. There are a spread of Al–O bond distances ranging from 1.90–2.08 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent AlO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 36°. There are a spread of Al–O bond distances ranging from 1.76–1.81 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Ca2+ and two equivalent Al3+ atoms to form distorted OCa4Al2 octahedra that share corners with two equivalent OCa4Al2 octahedra, corners with four equivalent OCa2Al2 tetrahedra, edges with two equivalent OCa4Al2 octahedra, and faces with four equivalent OCa4Al2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Al3+ atoms to form distorted OCa2Al2 tetrahedra that share corners with eight equivalent OCa4Al2 octahedra and corners with two equivalent OCa2Al2 tetrahedra. The corner-sharing octahedra tilt angles range from 19–83°. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ca2+ and two Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaAl2O4 by Materials Project

CaAl2O4 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 2.33–2.50 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedra tilt angles range from 49–56°. There are a spread of Al–O bond distances ranging from 1.93–2.01 Å. In the second Al3+ site, Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedra tilt angles range from 49–56°. There are a spread of Al–O bond distances ranging from 1.91–1.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ca2+ and three equivalent Al3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Al3 trigonal bipyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three Al3+ atoms. In the third O2- site, O2- is bonded to two equivalent Ca2+ and three equivalent Al3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Al3 square pyramids. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca11Al14O32 by Materials Project

Ca11Al14O32 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. there are seven 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 2.35–2.53 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 2.28–2.55 Å. In the third 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 2.27–2.63 Å. In the fourth Ca2+ site, Ca2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.39–2.48 Å. In the fifth Ca2+ site, Ca2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.41–2.51 Å. In the sixth 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 2.40–2.48 Å. In the seventh 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 2.37–2.49 Å. There are eight inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.76 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.74–1.80 Å. In the third Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is one shorter (1.72 Å) and three longer (1.77 Å) Al–O bond length. In the fourth Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is two shorter (1.74 Å) and two longer (1.78 Å) Al–O bond length. In the fifth Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.79 Å. In the sixth Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is one shorter (1.74 Å) and three longer (1.76 Å) Al–O bond length. In the seventh Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.81 Å. In the eighth Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is one shorter (1.72 Å) and three longer (1.80 Å) Al–O bond length. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two equivalent OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the second O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the fourth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with three OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the fifth O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+ and two Al3+ atoms. In the sixth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the seventh O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share a cornercorner with one OCa3Al tetrahedra, corners with three OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Al3+ atom. In the ninth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the tenth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share a cornercorner with one OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with three OCa2Al2 trigonal pyramids. In the eleventh O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the twelfth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the thirteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, and an edgeedge with one OCa2Al2 trigonal pyramid. In the fourteenth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with three OCa3Al tetrahedra, corners with nine OCa2Al2 trigonal pyramids, and edges with three OCa2Al2 trigonal pyramids. In the fifteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the sixteenth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with three OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with three OCa2Al2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaAl4O7 by Materials Project

CaAl4O7 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.36–2.45 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.74–1.82 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.81 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three Al3+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Al3+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca12Al14O33 by Materials Project

Ca12Al14O33 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to five O2- atoms to form distorted CaO5 trigonal bipyramids that share corners with six AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Ca–O bond distances ranging from 2.15–2.52 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 2.33–2.64 Å. In the third 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 2.32–2.57 Å. In the fourth 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 2.36–2.53 Å. In the fifth 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 2.32–2.55 Å. In the sixth Ca2+ site, Ca2+ is bonded to five O2- atoms to form distorted CaO5 trigonal bipyramids that share corners with six AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Ca–O bond distances ranging from 2.15–2.51 Å. In the seventh 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 2.33–2.53 Å. In the eighth 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 2.34–2.51 Å. In the ninth 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 2.37–2.50 Å. In the tenth 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 2.38–2.52 Å. In the eleventh 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 2.35–2.54 Å. In the twelfth 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 2.37–2.53 Å. There are fourteen inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is two shorter (1.75 Å) and two longer (1.76 Å) Al–O bond length. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.76 Å. In the third Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. All Al–O bond lengths are 1.76 Å. In the fourth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There is one shorter (1.74 Å) and three longer (1.79 Å) Al–O bond length. In the fifth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.74–1.80 Å. In the sixth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.75–1.80 Å. In the seventh Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.75–1.80 Å. In the eighth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There is three shorter (1.76 Å) and one longer (1.77 Å) Al–O bond length. In the ninth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.75–1.80 Å. In the tenth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. All Al–O bond lengths are 1.76 Å. In the eleventh Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.74–1.81 Å. In the twelfth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.75–1.81 Å. In the thirteenth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. All Al–O bond lengths are 1.76 Å. In the fourteenth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with three AlO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.74–1.80 Å. There are thirty-three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two Al3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Al3+ atom. In the third O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, and edges with two OCa2Al2 trigonal pyramids. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Al3+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the seventh O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with three OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the ninth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the tenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the eleventh O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with two OCa3Al tetrahedra, corners with eight OCa2Al2 trigonal pyramids, and edges with two OCa2Al2 trigonal pyramids. In the twelfth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the thirteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the fourteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and an edgeedge with one OCa2Al2 trigonal pyramid. In the fifteenth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with two OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with three OCa2Al2 trigonal pyramids. In the sixteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the seventeenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the eighteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with three OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the nineteenth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the twentieth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with two OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with two OCa2Al2 trigonal pyramids. In the twenty-first O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with two OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with two OCa2Al2 trigonal pyramids. In the twenty-second O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the twenty-third O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with two OCa2Al2 trigonal pyramids. In the twenty-fourth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the twenty-fifth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with three OCa3Al tetrahedra, corners with four OCa2Al2 trigonal pyramids, an edgeedge with one OCa3Al tetrahedra, and edges with three OCa2Al2 trigonal pyramids. In the twenty-sixth O2- site, O2- is bonded to two Ca2+ and two Al3+ atoms to form distorted OCa2Al2 trigonal pyramids that share corners with two OCa3Al tetrahedra, corners with five OCa2Al2 trigonal pyramids, and edges with two OCa2Al2 trigonal pyramids. In the twenty-seventh O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners with two OCa3Al tetrahedra, corners with seven OCa2Al2 trigonal pyramids, and edges with three OCa2Al2 trigonal pyramids. In the twenty-eighth O2- site, O2- is bonded to three Ca2+ and one Al3+ atom to form distorted OCa3Al tetrahedra that share corners

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaAl2O4 by Materials Project

CaAl2O4 crystallizes in the monoclinic P2_1/m 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 2.35–2.51 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are a spread of Al–O bond distances ranging from 1.90–2.01 Å. In the second Al3+ site, Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are a spread of Al–O bond distances ranging from 1.89–1.92 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Ca2+ and two Al3+ atoms to form distorted OCa3Al2 trigonal bipyramids that share corners with eleven OCa3Al2 trigonal bipyramids, corners with two equivalent OAl4 trigonal pyramids, edges with five OCa3Al2 trigonal bipyramids, an edgeedge with one OAl4 trigonal pyramid, and a faceface with one OCa3Al2 trigonal bipyramid. In the second O2- site, O2- is bonded to four Al3+ atoms to form OAl4 trigonal pyramids that share corners with eight OCa3Al2 trigonal bipyramids, corners with two equivalent OAl4 trigonal pyramids, edges with three OCaAl4 trigonal bipyramids, and edges with two equivalent OAl4 trigonal pyramids. In the third O2- site, O2- is bonded to three equivalent Ca2+ and two Al3+ atoms to form distorted OCa3Al2 trigonal bipyramids that share corners with nine OCa3Al2 trigonal bipyramids, corners with four equivalent OAl4 trigonal pyramids, edges with six OCa3Al2 trigonal bipyramids, and a faceface with one OCa3Al2 trigonal bipyramid. In the fourth O2- site, O2- is bonded to one Ca2+ and four Al3+ atoms to form distorted OCaAl4 trigonal bipyramids that share corners with six OCa3Al2 trigonal bipyramids, corners with two equivalent OAl4 trigonal pyramids, edges with seven OCa3Al2 trigonal bipyramids, and edges with two equivalent OAl4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaAl2O4 by Materials Project

CaAl2O4 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 3-coordinate geometry to three equivalent O2- atoms. All Ca–O bond lengths are 2.33 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with twelve AlO4 tetrahedra. There are three shorter (2.38 Å) and three longer (2.54 Å) Ca–O bond lengths. In the third Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.30 Å) and three longer (2.52 Å) Ca–O bond lengths. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent CaO6 octahedra and corners with four equivalent AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–72°. There is one shorter (1.77 Å) and three longer (1.78 Å) Al–O bond length. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent CaO6 octahedra and corners with four equivalent AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 61–65°. There are a spread of Al–O bond distances ranging from 1.77–1.79 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Ca2+ and two Al3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two Al3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Al3+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Al6O13 by Materials Project

Ca4Al6O13 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Ca2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are one shorter (2.37 Å) and three longer (2.47 Å) Ca–O bond lengths. Al3+ is bonded to four equivalent O2- atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.76 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a tetrahedral geometry to four equivalent Ca2+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ca2+ and two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3Al2O6 by Materials Project

Ca3Al2O6 crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one calcium molecule and one Ca4Al3O9 framework. In the Ca4Al3O9 framework, Ca2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are three shorter (2.30 Å) and six longer (2.78 Å) Ca–O bond lengths. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in an octahedral geometry to six O2- atoms. There is two shorter (1.79 Å) and four longer (2.01 Å) Al–O bond length. In the second Al3+ site, Al3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Al–O bond lengths are 1.82 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Ca2+ and one Al3+ atom to form a mixture of distorted corner and edge-sharing OCa4Al square pyramids. In the second O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ca2+ and two Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Al3O10 by Materials Project

Ca4Al3O10 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Ca sites. In the first Ca site, Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.27–2.72 Å. In the second Ca site, Ca is bonded in a 4-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.23–2.81 Å. In the third Ca site, Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.28–2.94 Å. In the fourth Ca site, Ca is bonded in a 1-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.25–2.89 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded to five O atoms to form AlO5 trigonal bipyramids that share corners with two equivalent AlO4 tetrahedra and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.79–1.94 Å. In the second Al site, Al is bonded to four O atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.80 Å. In the third Al site, Al is bonded to five O atoms to form AlO5 trigonal bipyramids that share a cornercorner with one AlO4 tetrahedra and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.80–1.98 Å. There are ten inequivalent O sites. In the first O site, O is bonded to four Ca and one Al atom to form distorted edge-sharing OCa4Al square pyramids. In the second O site, O is bonded in a 2-coordinate geometry to four Ca and two Al atoms. In the third O site, O is bonded in a distorted rectangular see-saw-like geometry to three Ca and one Al atom. In the fourth O site, O is bonded in a 4-coordinate geometry to three Ca and one Al atom. In the fifth O site, O is bonded in a 2-coordinate geometry to three Ca and two Al atoms. In the sixth O site, O is bonded in a distorted rectangular see-saw-like geometry to two Ca and two Al atoms. In the seventh O site, O is bonded in a 3-coordinate geometry to two equivalent Ca and one O atom. The O–O bond length is 1.36 Å. In the eighth O site, O is bonded to two Ca and two Al atoms to form distorted edge-sharing OCa2Al2 trigonal pyramids. In the ninth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Al atom. In the tenth O site, O is bonded in a distorted rectangular see-saw-like geometry to two Ca and two Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Al6O13 by Materials Project

Ca4Al6O13 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Ca2+ is bonded to four O2- atoms to form distorted CaO4 trigonal pyramids that share corners with six equivalent AlO4 tetrahedra and corners with three equivalent CaO4 trigonal pyramids. There are three shorter (2.28 Å) and one longer (2.37 Å) Ca–O bond lengths. Al3+ is bonded to four equivalent O2- atoms to form AlO4 tetrahedra that share corners with four equivalent AlO4 tetrahedra and corners with four equivalent CaO4 trigonal pyramids. All Al–O bond lengths are 1.77 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a tetrahedral geometry to four equivalent Ca2+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to one Ca2+ and two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2Al3O8 by Materials Project

Ca2Al3O8 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.23–2.46 Å. In the second Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.73 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.76–1.80 Å. In the second Al site, Al is bonded to four O atoms to form corner-sharing AlO4 tetrahedra. There is two shorter (1.77 Å) and two longer (1.78 Å) Al–O bond length. There are five inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to one Ca and two equivalent Al atoms. In the second O site, O is bonded in a 4-coordinate geometry to three Ca and one O atom. The O–O bond length is 1.33 Å. In the third O site, O is bonded in a trigonal planar geometry to one Ca and two Al atoms. In the fourth O site, O is bonded in a distorted trigonal planar geometry to one Ca and two Al atoms. In the fifth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ca and one Al atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2Al3O8 by Materials Project

Ca2Al3O8 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Ca is bonded in a 6-coordinate geometry to six O atoms. There are three shorter (2.29 Å) and three longer (2.57 Å) Ca–O bond lengths. Al is bonded to four equivalent O atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.77 Å. There are two inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to three equivalent Ca atoms. In the second O site, O is bonded in a trigonal planar geometry to one Ca and two equivalent Al atoms.

36 MATERIALS SCIENCE↗