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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CaCu3(GeO3)4 by Materials Project

CaCu3(GeO3)4 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Ca2+ is bonded to twelve equivalent O2- atoms to form CaO12 cuboctahedra that share faces with eight equivalent GeO6 octahedra. All Ca–O bond lengths are 2.58 Å. Cu2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.98 Å. Ge4+ is bonded to six equivalent O2- atoms to form GeO6 octahedra that share corners with six equivalent GeO6 octahedra and faces with two equivalent CaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 37°. All Ge–O bond lengths are 1.93 Å. O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cu2+, and two equivalent Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCu(GeO3)2 by Materials Project

CaCuGe2O6 is Esseneite structured and crystallizes in the monoclinic C2/c 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 2.35–2.75 Å. Cu2+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with six equivalent GeO4 tetrahedra and edges with two equivalent CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.99–2.29 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 45–61°. There are a spread of Ge–O bond distances ranging from 1.74–1.84 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and two equivalent Ge4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cu2+, and one Ge4+ atom. In the third O2- site, O2- is bonded to one Ca2+, two equivalent Cu2+, and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OCaCu2Ge tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCu(GeO3)2 by Materials Project

CaCuGe2O6 crystallizes in the monoclinic P2_1/c 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 2.35–2.69 Å. Cu2+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with three equivalent GeO4 tetrahedra, corners with two equivalent GeO5 trigonal bipyramids, edges with two equivalent CuO6 octahedra, and an edgeedge with one GeO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.94–2.52 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 49–70°. There are a spread of Ge–O bond distances ranging from 1.73–1.82 Å. In the second Ge4+ site, Ge4+ is bonded to five O2- atoms to form GeO5 trigonal bipyramids that share corners with two equivalent CuO6 octahedra, corners with two equivalent GeO5 trigonal bipyramids, an edgeedge with one CuO6 octahedra, and an edgeedge with one GeO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 40–50°. There are a spread of Ge–O bond distances ranging from 1.81–2.06 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+, two equivalent Cu2+, and one Ge4+ atom. In the second O2- site, O2- is bonded to one Ca2+, two equivalent Cu2+, and one Ge4+ atom to form distorted corner-sharing OCaCu2Ge tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+ and two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to one Ca2+ and two equivalent Ge4+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, one Cu2+, and two equivalent Ge4+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Cu2+, and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCu2(GeO3)4 by Materials Project

CaCu2(GeO3)4 crystallizes in the monoclinic P2_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 2.36–2.56 Å. There are two inequivalent Cu3+ sites. In the first Cu3+ site, Cu3+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with three GeO4 tetrahedra, corners with two equivalent GeO5 trigonal bipyramids, and an edgeedge with one GeO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.88–2.32 Å. In the second Cu3+ site, Cu3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.85–2.52 Å. There are four inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 49–65°. There is three shorter (1.77 Å) and one longer (1.80 Å) Ge–O bond length. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 60°. There are a spread of Ge–O bond distances ranging from 1.75–1.81 Å. In the third Ge4+ site, Ge4+ is bonded to five O2- atoms to form GeO5 trigonal bipyramids that share corners with two equivalent CuO6 octahedra, corners with two equivalent GeO5 trigonal bipyramids, and an edgeedge with one GeO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 42°. There are a spread of Ge–O bond distances ranging from 1.80–1.97 Å. In the fourth Ge4+ site, Ge4+ is bonded to five O2- atoms to form GeO5 trigonal bipyramids that share corners with two equivalent GeO5 trigonal bipyramids, an edgeedge with one CuO6 octahedra, and an edgeedge with one GeO5 trigonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.77–2.08 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, two Cu3+, and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Cu3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a distorted tetrahedral geometry to one Ca2+, two Cu3+, and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ca2+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Ge4+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two Ge4+ atoms. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to two Ge4+ atoms. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Cu3+ and two Ge4+ atoms. In the ninth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+, one Cu3+, and two Ge4+ atoms. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Cu3+ and one Ge4+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Cu3+, and one Ge4+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to two Cu3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCu2(GeO3)4 by Materials Project

CaCu2(GeO3)4 is Esseneite-like structured and crystallizes in the monoclinic C2 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 2.42–2.52 Å. There are two inequivalent Cu3+ sites. In the first Cu3+ site, Cu3+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with six GeO4 tetrahedra and edges with two equivalent CuO6 octahedra. There are four shorter (1.97 Å) and two longer (2.18 Å) Cu–O bond lengths. In the second Cu3+ site, Cu3+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with six GeO4 tetrahedra and edges with two equivalent CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 2.02–2.06 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–61°. There are a spread of Ge–O bond distances ranging from 1.74–1.80 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three CuO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–61°. There are a spread of Ge–O bond distances ranging from 1.77–1.80 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Ge4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and two Ge4+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cu3+, and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cu3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded to one Ca2+, two Cu3+, and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OCaCu2Ge tetrahedra. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3Cu2(GeO4)3 by Materials Project

Ca3Cu2(GeO4)3 crystallizes in the cubic Ia-3d space group. The structure is three-dimensional. Ca2+ is bonded in a distorted body-centered cubic geometry to eight equivalent O2- atoms. There are four shorter (2.40 Å) and four longer (2.53 Å) Ca–O bond lengths. Cu3+ is bonded to six equivalent O2- atoms to form CuO6 octahedra that share corners with six equivalent GeO4 tetrahedra. All Cu–O bond lengths are 2.04 Å. Ge4+ is bonded to four equivalent O2- atoms to form GeO4 tetrahedra that share corners with four equivalent CuO6 octahedra. The corner-sharing octahedral tilt angles are 49°. All Ge–O bond lengths are 1.79 Å. O2- is bonded in a 4-coordinate geometry to two equivalent Ca2+, one Cu3+, and one Ge4+ atom.

36 MATERIALS SCIENCE↗