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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Ca2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ca–O bond distances ranging from 2.47–3.03 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.29 Å) and one longer (1.31 Å) C–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite structured and crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent O2- atoms to form corner-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 62°. All Ca–O bond lengths are 2.39 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.30 Å. O2- is bonded in a trigonal planar geometry to two equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 crystallizes in the orthorhombic Pnma 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 2.43–2.69 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ca2+ is bonded to six O2- atoms to form corner-sharing CaO6 octahedra. The corner-sharing octahedra tilt angles range from 61–63°. There are a spread of Ca–O bond distances ranging from 2.38–2.40 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.36–2.50 Å. In the second Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.35–2.49 Å. There are four inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the third C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. In the fourth C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite-like structured and crystallizes in the hexagonal P6_522 space group. The structure is three-dimensional. there are three inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing CaO6 octahedra. The corner-sharing octahedra tilt angles range from 48–68°. There are a spread of Ca–O bond distances ranging from 2.33–2.46 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 64°. There are four shorter (2.38 Å) and two longer (2.41 Å) Ca–O bond lengths. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 octahedra. The corner-sharing octahedra tilt angles range from 48–68°. There are a spread of Ca–O bond distances ranging from 2.36–2.45 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite-like structured and crystallizes in the monoclinic C2 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 corner-sharing CaO6 octahedra. The corner-sharing octahedra tilt angles range from 60–62°. There are three shorter (2.38 Å) and three longer (2.39 Å) Ca–O bond lengths. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 59–63°. There are a spread of Ca–O bond distances ranging from 2.39–2.41 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional and consists of four formaldehyde molecules and one CaO2 framework. In the CaO2 framework, Ca2+ is bonded in a distorted square co-planar geometry to four equivalent O2- atoms. There are two shorter (2.43 Å) and two longer (2.44 Å) Ca–O bond lengths. O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one O2- atom. The O–O bond length is 1.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 crystallizes in the triclinic P-1 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 2.37–2.61 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.29 Å) and one longer (1.31 Å) C–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Ca2+ is bonded to seven O2- atoms to form distorted edge-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.32–2.70 Å. There are two inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.25 Å. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.26 Å) C–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaC2O5 by Materials Project

CaC2O5 crystallizes in the monoclinic C2/m 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 2.38–2.60 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the second C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.26 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite-like structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are ten 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 2.33–2.47 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing CaO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 65°. There are a spread of Ca–O bond distances ranging from 2.38–2.44 Å. In the third Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing CaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 46–69°. There are a spread of Ca–O bond distances ranging from 2.32–2.44 Å. In the fourth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.36–2.47 Å. In the fifth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.34–2.46 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 2.34–2.46 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 2.34–2.47 Å. In the eighth Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing CaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 44–68°. There are a spread of Ca–O bond distances ranging from 2.32–2.47 Å. In the ninth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted corner-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.35–2.46 Å. In the tenth Ca2+ site, Ca2+ is bonded to six O2- atoms to form corner-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.32–2.47 Å. There are nine inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the third C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the fourth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.30 Å) and one longer (1.31 Å) C–O bond length. In the fifth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the sixth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the seventh C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the eighth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the ninth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are twenty-seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C4+ atom. In the tenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the twelfth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the thirteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the fourteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the fifteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the seventeenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the eighteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the nineteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twentieth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the twenty-seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 is Calcite-like structured and crystallizes in the monoclinic C2/c 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 corner-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.34–2.46 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form a mixture of distorted corner and edge-sharing CaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 48–67°. There are a spread of Ca–O bond distances ranging from 2.34–2.43 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO4 by Materials Project

CaCO4 crystallizes in the trigonal P3_1 space group. The structure is three-dimensional. there are three inequivalent Ca sites. In the first Ca site, Ca is bonded to seven O atoms to form corner-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.34–2.50 Å. In the second Ca site, Ca is bonded to seven O atoms to form corner-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.35–2.51 Å. In the third Ca site, Ca is bonded to seven O atoms to form distorted corner-sharing CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.34–2.47 Å. There are three inequivalent C sites. In the first C site, C is bonded in a trigonal planar geometry to three O atoms. There is two shorter (1.29 Å) and one longer (1.31 Å) C–O bond length. In the second C site, C is bonded in a trigonal planar geometry to three O atoms. There is two shorter (1.29 Å) and one longer (1.31 Å) C–O bond length. In the third C site, C is bonded in a trigonal planar geometry to three O atoms. There is two shorter (1.29 Å) and one longer (1.30 Å) C–O bond length. There are twelve inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two Ca and one C atom. In the second O site, O is bonded in a 3-coordinate geometry to two Ca and one C atom. In the third O site, O is bonded in a bent 150 degrees geometry to two equivalent Ca atoms. In the fourth O site, O is bonded in a 3-coordinate geometry to two Ca and one C atom. In the fifth O site, O is bonded in a bent 150 degrees geometry to two equivalent Ca atoms. In the sixth O site, O is bonded in a distorted bent 150 degrees geometry to one Ca and one C atom. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Ca and one C atom. In the eighth O site, O is bonded in a 1-coordinate geometry to two Ca and one C atom. In the ninth O site, O is bonded in a bent 150 degrees geometry to two equivalent Ca atoms. In the tenth O site, O is bonded in a distorted bent 150 degrees geometry to one Ca and one C atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to two Ca and one C atom. In the twelfth O site, O is bonded in a 3-coordinate geometry to two Ca and one C atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCO3 by Materials Project

CaCO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are five inequivalent Ca2+ sites. In the first 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 2.41–2.62 Å. In the second Ca2+ site, Ca2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.84 Å. In the third Ca2+ site, Ca2+ is bonded in a distorted pentagonal bipyramidal geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.57 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–3.00 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 2.41–2.67 Å. There are five inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.28–1.32 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.28–1.31 Å. In the third C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.29–1.31 Å. In the fourth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.28 Å) and two longer (1.31 Å) C–O bond length. In the fifth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.28 Å) and two longer (1.31 Å) C–O bond length. There are fifteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to three Ca2+ and one C4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to three Ca2+ and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to three Ca2+ and one C4+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to three Ca2+ and one C4+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to three Ca2+ and one C4+ atom. In the twelfth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the thirteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the fourteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one C4+ atom. In the fifteenth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CO2)2 by Materials Project

CaC2O4 crystallizes in the monoclinic P2/m space group. The structure is two-dimensional and consists of one CaC2O4 sheet oriented in the (1, 0, 0) direction. there are two 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 2.23–2.56 Å. In the second Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.29–3.04 Å. There are four inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the third C3+ site, C3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the fourth C3+ site, C3+ is bonded in a single-bond geometry to one O2- atom. The C–O bond length is 1.33 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one C3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and one C3+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ca2+, one C3+, and one O2- atom. The O–O bond length is 1.45 Å. In the sixth O2- site, O2- is bonded in a distorted L-shaped geometry to one Ca2+ and one O2- atom.

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