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DOE OSTI2020

Materials Data on Ca3SiO5 by Materials Project

Ca3SiO5 crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first 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 2.41–2.47 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with two equivalent CaO6 octahedra, a cornercorner with one CaO6 pentagonal pyramid, corners with four SiO4 tetrahedra, edges with two equivalent CaO6 pentagonal pyramids, and faces with two equivalent CaO6 octahedra. The corner-sharing octahedral tilt angles are 75°. There are a spread of Ca–O bond distances ranging from 2.33–2.49 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 pentagonal pyramids that share a cornercorner with one CaO6 octahedra, corners with two equivalent CaO6 pentagonal pyramids, corners with four SiO4 tetrahedra, edges with two equivalent CaO6 octahedra, and faces with two equivalent CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 1°. There are a spread of Ca–O bond distances ranging from 2.37–2.51 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent CaO6 octahedra and corners with six equivalent CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 54°. There is one shorter (1.64 Å) and three longer (1.65 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent CaO6 octahedra and corners with three equivalent CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 66°. There is three shorter (1.66 Å) and one longer (1.67 Å) Si–O bond length. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with six equivalent CaO6 octahedra and corners with three equivalent CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 53°. There is three shorter (1.65 Å) and one longer (1.67 Å) Si–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Ca2+ and one Si4+ atom to form corner-sharing OCa3Si tetrahedra. The corner-sharing octahedra tilt angles range from 13–63°. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded to three equivalent Ca2+ and one Si4+ atom to form corner-sharing OCa3Si tetrahedra. The corner-sharing octahedra tilt angles range from 15–61°. In the seventh O2- site, O2- is bonded to six Ca2+ atoms to form OCa6 octahedra that share corners with six OCa3Si tetrahedra and faces with two OCa6 octahedra. In the eighth O2- site, O2- is bonded to six Ca2+ atoms to form OCa6 octahedra that share corners with three equivalent OCa6 octahedra, corners with three equivalent OCa3Si tetrahedra, and a faceface with one OCa6 octahedra. The corner-sharing octahedral tilt angles are 1°. In the ninth O2- site, O2- is bonded to six Ca2+ atoms to form OCa6 octahedra that share corners with three equivalent OCa6 octahedra, corners with three equivalent OCa3Si tetrahedra, and a faceface with one OCa6 octahedra. The corner-sharing octahedral tilt angles are 1°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are six 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 2.24–2.81 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 2.21–2.51 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 2.25–2.90 Å. In the fourth 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 2.35–2.87 Å. In the fifth 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 2.34–2.67 Å. In the sixth 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 2.37–2.68 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.67 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the third Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to four Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a distorted tetrahedral geometry to three Ca2+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to three Ca2+ and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaSiO3 by Materials Project

CaSiO3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded to twelve O2- atoms to form distorted CaO12 cuboctahedra that share corners with twelve equivalent CaO12 cuboctahedra, faces with six equivalent CaO12 cuboctahedra, and faces with eight equivalent SiO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.38–2.73 Å. Si4+ is bonded to six O2- atoms to form SiO6 octahedra that share corners with six equivalent SiO6 octahedra and faces with eight equivalent CaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 10–11°. All Si–O bond lengths are 1.81 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Ca2+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Ca2+ and two equivalent Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaSiO3 by Materials Project

CaSiO3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are five inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to eight O2- atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent CaO8 hexagonal bipyramids, corners with two equivalent SiO4 tetrahedra, edges with six equivalent CaO8 hexagonal bipyramids, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.33–2.70 Å. In the second Ca2+ site, Ca2+ is bonded to eight O2- atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent CaO8 hexagonal bipyramids, corners with two equivalent SiO4 tetrahedra, edges with six CaO8 hexagonal bipyramids, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.29–2.68 Å. In the third Ca2+ site, Ca2+ is bonded to eight O2- atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent CaO8 hexagonal bipyramids, corners with two equivalent SiO4 tetrahedra, edges with six CaO8 hexagonal bipyramids, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.32–2.66 Å. In the fourth Ca2+ site, Ca2+ is bonded to eight O2- atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent CaO8 hexagonal bipyramids, corners with two equivalent SiO4 tetrahedra, edges with six CaO8 hexagonal bipyramids, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.29–2.69 Å. In the fifth Ca2+ site, Ca2+ is bonded to eight O2- atoms to form distorted CaO8 hexagonal bipyramids that share corners with two CaO8 hexagonal bipyramids, corners with two SiO4 tetrahedra, edges with six CaO8 hexagonal bipyramids, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.29–2.68 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two CaO8 hexagonal bipyramids, corners with two SiO4 tetrahedra, and edges with four CaO8 hexagonal bipyramids. There are a spread of Si–O bond distances ranging from 1.60–1.68 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two CaO8 hexagonal bipyramids, corners with two SiO4 tetrahedra, and edges with four CaO8 hexagonal bipyramids. There is two shorter (1.60 Å) and two longer (1.68 Å) Si–O bond length. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two CaO8 hexagonal bipyramids, corners with two SiO4 tetrahedra, and edges with four CaO8 hexagonal bipyramids. There are a spread of Si–O bond distances ranging from 1.60–1.69 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+ and two Si4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+ and two Si4+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+ and two Si4+ atoms. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaSiO3 by Materials Project

CaSiO3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three 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 2.36–2.61 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with five SiO4 tetrahedra, edges with two equivalent CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.33–2.52 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with five SiO4 tetrahedra, edges with two equivalent CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.29–2.60 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two CaO6 octahedra, corners with two SiO4 tetrahedra, and edges with two CaO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Si–O bond distances ranging from 1.62–1.69 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four CaO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–61°. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four CaO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–62°. There are a spread of Si–O bond distances ranging from 1.60–1.67 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ca2+ and two Si4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Si4+ atoms. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3Si2O7 by Materials Project

Ca3Si2O7 is Esseneite-derived structured and crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. there are four inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with four CaO6 octahedra, corners with five SiO4 tetrahedra, an edgeedge with one CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 55–72°. There are a spread of Ca–O bond distances ranging from 2.24–2.52 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 2.37–2.68 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with four CaO6 octahedra, corners with two SiO4 tetrahedra, edges with three CaO6 octahedra, and edges with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 62–72°. There are a spread of Ca–O bond distances ranging from 2.34–2.47 Å. In the fourth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with eight CaO6 octahedra, corners with four SiO4 tetrahedra, edges with two equivalent CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 55–65°. There are a spread of Ca–O bond distances ranging from 2.33–2.53 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with six CaO6 octahedra and edges with three CaO6 octahedra. The corner-sharing octahedra tilt angles range from 52–59°. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four CaO6 octahedra, a cornercorner with one SiO4 tetrahedra, and edges with two CaO6 octahedra. The corner-sharing octahedra tilt angles range from 52–62°. There are a spread of Si–O bond distances ranging from 1.63–1.73 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent CaO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–69°. There is two shorter (1.61 Å) and two longer (1.69 Å) Si–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaSiO3 by Materials Project

CaSiO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ca2+ is bonded to twelve equivalent O2- atoms to form CaO12 cuboctahedra that share corners with twelve equivalent CaO12 cuboctahedra, faces with six equivalent CaO12 cuboctahedra, and faces with eight equivalent SiO6 octahedra. All Ca–O bond lengths are 2.55 Å. Si4+ is bonded to six equivalent O2- atoms to form SiO6 octahedra that share corners with six equivalent SiO6 octahedra and faces with eight equivalent CaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Si–O bond lengths are 1.80 Å. O2- is bonded in a distorted linear geometry to four equivalent Ca2+ and two equivalent Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaSiO3 by Materials Project

CaSiO3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first 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 2.27–2.69 Å. In the second Ca2+ site, Ca2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Ca–O bond distances ranging from 2.16–2.40 Å. In the third Ca2+ site, Ca2+ is bonded in a 2-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.17–2.70 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.63–1.72 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and two Si4+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Si4+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and two Si4+ atoms. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.27–3.09 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 2.32–2.72 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.65 Å) and one longer (1.66 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to three Ca2+ and one Si4+ atom to form distorted edge-sharing OCa3Si tetrahedra. In the second O2- site, O2- is bonded in a 1-coordinate geometry to five Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to four Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first 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 2.18–2.52 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 2.39–2.74 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with six equivalent SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.27–2.34 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent CaO6 octahedra. The corner-sharing octahedra tilt angles range from 11–39°. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the monoclinic Cc 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 2.24–2.76 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 2.23–2.53 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.64 Å) and one longer (1.70 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first 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 2.25–2.67 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with six equivalent SiO4 tetrahedra and edges with two equivalent CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.41–2.49 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with six equivalent SiO4 tetrahedra and edges with two equivalent CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.25–2.46 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with six CaO6 octahedra. The corner-sharing octahedra tilt angles range from 30–62°. There are a spread of Si–O bond distances ranging from 1.63–1.67 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded to three Ca2+ and one Si4+ atom to form distorted corner-sharing OCa3Si tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.56 Å. Si4+ is bonded to six O2- atoms to form corner-sharing SiO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There is four shorter (1.81 Å) and two longer (1.82 Å) Si–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to five equivalent Ca2+ and one Si4+ atom to form distorted OCa5Si octahedra that share corners with seventeen OCa5Si octahedra, edges with eight equivalent OCa5Si octahedra, and faces with four equivalent OCa4Si2 octahedra. The corner-sharing octahedra tilt angles range from 0–57°. In the second O2- site, O2- is bonded to four equivalent Ca2+ and two equivalent Si4+ atoms to form distorted OCa4Si2 octahedra that share corners with fourteen OCa5Si octahedra, edges with two equivalent OCa4Si2 octahedra, and faces with eight OCa5Si octahedra. The corner-sharing octahedra tilt angles range from 0–57°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca8Si5O18 by Materials Project

Ca8Si5O18 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. there are five inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with eight CaO6 octahedra, corners with four SiO4 tetrahedra, edges with two CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–68°. There are a spread of Ca–O bond distances ranging from 2.33–2.52 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with four equivalent CaO6 octahedra, corners with two equivalent SiO4 tetrahedra, edges with four CaO6 octahedra, and edges with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 64–68°. There are two shorter (2.34 Å) and four longer (2.41 Å) Ca–O bond lengths. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with four CaO6 octahedra, corners with two SiO4 tetrahedra, edges with three CaO6 octahedra, and edges with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 60–75°. There are a spread of Ca–O bond distances ranging from 2.33–2.50 Å. In the fourth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with four CaO6 octahedra, corners with five SiO4 tetrahedra, an edgeedge with one CaO6 octahedra, and an edgeedge with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–75°. There are a spread of Ca–O bond distances ranging from 2.24–2.52 Å. In the fifth 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 2.37–2.65 Å. There are three inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with six CaO6 octahedra and edges with three CaO6 octahedra. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four CaO6 octahedra, a cornercorner with one SiO4 tetrahedra, and edges with two CaO6 octahedra. The corner-sharing octahedra tilt angles range from 52–63°. There are a spread of Si–O bond distances ranging from 1.63–1.73 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent CaO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–69°. There is two shorter (1.61 Å) and two longer (1.68 Å) Si–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+ and two Si4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO4 by Materials Project

Ca2SiO4 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a distorted single-bond geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.02–2.79 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 2.30–2.70 Å. Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.62 Å) and three longer (1.64 Å) Si–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to one Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO5 by Materials Project

Ca2SiO5 crystallizes in the orthorhombic Pbca 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 2.37–2.61 Å. In the second Ca site, Ca is bonded in a 2-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.24–3.04 Å. Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.60–1.70 Å. There are five inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to three Ca and one Si atom. In the second O site, O is bonded to three Ca and one Si atom to form distorted corner-sharing OCa3Si trigonal pyramids. In the third O site, O is bonded in a distorted single-bond geometry to two equivalent Ca, one Si, and one O atom. The O–O bond length is 1.52 Å. In the fourth O site, O is bonded in a 3-coordinate geometry to three Ca and one O atom. In the fifth O site, O is bonded in a 5-coordinate geometry to four Ca and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2SiO5 by Materials Project

Ca2SiO5 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are four 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 2.30–2.54 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 2.30–2.52 Å. In the third Ca site, Ca is bonded to six O atoms to form CaO6 octahedra that share corners with five SiO4 tetrahedra and an edgeedge with one CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.55 Å. In the fourth Ca site, Ca is bonded to six O atoms to form CaO6 octahedra that share corners with five SiO4 tetrahedra and an edgeedge with one CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.54 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with five CaO6 octahedra. The corner-sharing octahedra tilt angles range from 8–69°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with five CaO6 octahedra. The corner-sharing octahedra tilt angles range from 8–69°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two Ca and one Si atom. In the second O site, O is bonded in a 3-coordinate geometry to two Ca and one Si atom. In the third O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the fourth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the fifth O site, O is bonded in a trigonal planar geometry to three Ca atoms. In the sixth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the seventh O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the eighth O site, O is bonded to three Ca and one Si atom to form distorted edge-sharing OCa3Si trigonal pyramids. In the ninth O site, O is bonded in a trigonal planar geometry to three Ca atoms. In the tenth O site, O is bonded to three Ca and one Si atom to form distorted edge-sharing OCa3Si trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3(Si3O11)2 by Materials Project

Ca3(Si3O11)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are three inequivalent Ca sites. In the first Ca site, Ca is bonded in a 5-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.24–3.05 Å. In the second Ca site, Ca is bonded to five O atoms to form distorted CaO5 trigonal bipyramids that share corners with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.22–2.85 Å. In the third Ca site, Ca is bonded in a 4-coordinate geometry to five O atoms. There are a spread of Ca–O bond distances ranging from 2.23–3.08 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three SiO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three SiO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There is two shorter (1.63 Å) and two longer (1.64 Å) Si–O bond length. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three SiO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the fifth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three SiO4 tetrahedra and a cornercorner with one CaO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. There are twenty-two inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the second O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the third O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourth O site, O is bonded in a trigonal planar geometry to two Ca and one Si atom. In the fifth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the seventh O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the eighth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the tenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the eleventh O site, O is bonded in a distorted tetrahedral geometry to three Ca and one Si atom. In the twelfth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the thirteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourteenth O site, O is bonded in a bent 120 degrees geometry to one Ca and one Si atom. In the fifteenth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the sixteenth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.29 Å. In the seventeenth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.23 Å. In the eighteenth O site, O is bonded in a bent 120 degrees geometry to one Ca and one O atom. The O–O bond length is 1.31 Å. In the nineteenth O site, O is bonded in a bent 120 degrees geometry to one Ca and one O atom. In the twentieth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.23 Å. In the twenty-first O site, O is bonded in a bent 120 degrees geometry to two O atoms. In the twenty-second O site, O is bonded in a 3-coordinate geometry to two Ca and one O atom.

36 MATERIALS SCIENCE↗