DOE OSTI2020
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.