Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ge-Na-O”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

14 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na4GeO4 by Materials Project

Na4GeO4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five O2- atoms to form NaO5 square pyramids that share corners with three equivalent NaO5 square pyramids, corners with two equivalent NaO4 tetrahedra, corners with three equivalent GeO4 tetrahedra, edges with five NaO5 square pyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.39–2.51 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form NaO5 square pyramids that share corners with three equivalent NaO5 square pyramids, a cornercorner with one GeO4 tetrahedra, corners with two equivalent NaO4 tetrahedra, edges with five NaO5 square pyramids, and edges with two equivalent GeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.39–2.53 Å. In the third Na1+ site, Na1+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.40 Å. In the fourth Na1+ site, Na1+ is bonded to four O2- atoms to form distorted NaO4 tetrahedra that share corners with four NaO5 square pyramids, corners with four equivalent GeO4 tetrahedra, and edges with two equivalent NaO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.31–2.36 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with four NaO5 square pyramids, corners with four equivalent NaO4 tetrahedra, and edges with three NaO5 square pyramids. There are a spread of Ge–O bond distances ranging from 1.77–1.81 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to five Na1+ and one Ge4+ atom to form a mixture of distorted corner and edge-sharing ONa5Ge octahedra. The corner-sharing octahedra tilt angles range from 12–27°. In the second O2- site, O2- is bonded to five Na1+ and one Ge4+ atom to form a mixture of corner and edge-sharing ONa5Ge octahedra. The corner-sharing octahedra tilt angles range from 12–27°. In the third O2- site, O2- is bonded to five Na1+ and one Ge4+ atom to form a mixture of distorted corner and edge-sharing ONa5Ge octahedra. The corner-sharing octahedra tilt angles range from 13–15°. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Na1+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na4Ge9O20 by Materials Project

Na4Ge9O20 crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.84 Å. There are three 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 GeO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 64°. There are a spread of Ge–O bond distances ranging from 1.76–1.80 Å. In the second Ge4+ site, Ge4+ is bonded to four equivalent O2- atoms to form corner-sharing GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 60°. All Ge–O bond lengths are 1.77 Å. In the third Ge4+ site, Ge4+ is bonded to six O2- atoms to form GeO6 octahedra that share corners with three GeO4 tetrahedra and edges with three equivalent GeO6 octahedra. There are a spread of Ge–O bond distances ranging from 1.86–2.02 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three equivalent Ge4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+ and two Ge4+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Na1+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge4O9 by Materials Project

Na2Ge4O9 crystallizes in the trigonal P-3c1 space group. The structure is three-dimensional. Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.47–2.88 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 GeO6 octahedra and corners with two GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 56–61°. There are a spread of Ge–O bond distances ranging from 1.76–1.81 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent GeO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. There is two shorter (1.79 Å) and two longer (1.82 Å) Ge–O bond length. In the third Ge4+ site, Ge4+ is bonded to six O2- atoms to form corner-sharing GeO6 octahedra. There is three shorter (1.89 Å) and three longer (1.92 Å) Ge–O bond length. In the fourth Ge4+ site, Ge4+ is bonded to six equivalent O2- atoms to form corner-sharing GeO6 octahedra. All Ge–O bond lengths are 1.95 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Na1+ and two Ge4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Na1+ and two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded to two equivalent Na1+ and two Ge4+ atoms to form distorted corner-sharing ONa2Ge2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2GeO3 by Materials Project

Na2GeO3 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with four equivalent GeO4 tetrahedra, corners with five equivalent NaO5 trigonal bipyramids, an edgeedge with one GeO4 tetrahedra, and edges with four equivalent NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.32–2.67 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent GeO4 tetrahedra, corners with eight equivalent NaO5 trigonal bipyramids, and edges with two equivalent NaO5 trigonal bipyramids. There are a spread of Ge–O bond distances ranging from 1.74–1.85 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Na1+ and two equivalent Ge4+ atoms to form distorted corner-sharing ONa2Ge2 trigonal pyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four equivalent Na1+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 square pyramids that share corners with four equivalent NaO5 square pyramids, corners with four GeO4 tetrahedra, and an edgeedge with one GeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.40–2.69 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.80 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 two equivalent NaO5 square pyramids, corners with three GeO4 tetrahedra, and an edgeedge with one NaO5 square pyramid. There are a spread of Ge–O bond distances ranging from 1.71–1.81 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent NaO5 square pyramids and corners with three GeO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.72–1.81 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded to four Na1+ and one Ge4+ atom to form distorted corner-sharing ONa4Ge trigonal bipyramids. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Na1+ and two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with four GeO4 tetrahedra, corners with four NaO5 trigonal bipyramids, an edgeedge with one GeO4 tetrahedra, and edges with four NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.39–2.70 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with four GeO4 tetrahedra, corners with four NaO5 trigonal bipyramids, an edgeedge with one GeO4 tetrahedra, and edges with four NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.39–2.71 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 GeO4 tetrahedra, corners with four NaO5 trigonal bipyramids, and an edgeedge with one NaO5 trigonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.73–1.80 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent GeO4 tetrahedra, corners with four NaO5 trigonal bipyramids, and an edgeedge with one NaO5 trigonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.72–1.81 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the second O2- site, O2- is bonded to four Na1+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing ONa4Ge trigonal bipyramids. In the third O2- site, O2- is bonded to four Na1+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing ONa4Ge trigonal bipyramids. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with two equivalent NaO6 octahedra, corners with four GeO4 tetrahedra, corners with two equivalent NaO5 trigonal bipyramids, edges with two equivalent NaO6 octahedra, edges with two equivalent GeO4 tetrahedra, and edges with two equivalent NaO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 18°. There are a spread of Na–O bond distances ranging from 2.37–2.73 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent NaO6 octahedra, corners with four GeO4 tetrahedra, corners with two equivalent NaO5 trigonal bipyramids, edges with two equivalent NaO6 octahedra, an edgeedge with one GeO4 tetrahedra, and edges with two equivalent NaO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 24–69°. There are a spread of Na–O bond distances ranging from 2.34–2.76 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 two equivalent NaO6 octahedra, corners with three GeO4 tetrahedra, corners with three equivalent NaO5 trigonal bipyramids, and an edgeedge with one NaO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 39–55°. There are a spread of Ge–O bond distances ranging from 1.73–1.81 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent NaO6 octahedra, corners with three GeO4 tetrahedra, a cornercorner with one NaO5 trigonal bipyramid, and edges with two equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 57–68°. There are a spread of Ge–O bond distances ranging from 1.72–1.81 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+ and two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.41–2.85 Å. In the second Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.40–2.98 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form corner-sharing GeO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.71–1.82 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form corner-sharing GeO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.71–1.82 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to four Na1+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Na1+ and two Ge4+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Na1+ and two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with four equivalent GeO4 tetrahedra, corners with four equivalent NaO5 trigonal bipyramids, an edgeedge with one GeO4 tetrahedra, and edges with four equivalent NaO5 trigonal bipyramids. There are a spread of Na–O bond distances ranging from 2.30–2.78 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with three equivalent GeO4 tetrahedra, corners with four equivalent NaO5 trigonal bipyramids, and an edgeedge with one NaO5 trigonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.73–1.81 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Ge4+ atoms. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four equivalent Na1+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two equivalent Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ge2O5 by Materials Project

Na2Ge2O5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 square pyramids that share corners with four equivalent NaO5 square pyramids, corners with four GeO4 tetrahedra, and an edgeedge with one GeO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.40–2.70 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.37–2.89 Å. In the third Na1+ site, Na1+ is bonded to five O2- atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent NaO6 octahedra, corners with four GeO4 tetrahedra, corners with two equivalent NaO5 trigonal bipyramids, edges with two equivalent NaO6 octahedra, an edgeedge with one GeO4 tetrahedra, and edges with two equivalent NaO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 26–68°. There are a spread of Na–O bond distances ranging from 2.33–2.73 Å. In the fourth Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with two equivalent NaO6 octahedra, corners with four GeO4 tetrahedra, corners with two equivalent NaO5 trigonal bipyramids, edges with two equivalent NaO6 octahedra, edges with two equivalent GeO4 tetrahedra, and edges with two equivalent NaO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 19°. There are a spread of Na–O bond distances ranging from 2.39–2.71 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 a cornercorner with one NaO6 octahedra, a cornercorner with one NaO5 square pyramid, corners with three GeO4 tetrahedra, a cornercorner with one NaO5 trigonal bipyramid, and edges with two equivalent NaO6 octahedra. The corner-sharing octahedral tilt angles are 68°. There are a spread of Ge–O bond distances ranging from 1.72–1.80 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with three GeO4 tetrahedra, corners with two equivalent NaO5 trigonal bipyramids, and an edgeedge with one NaO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 54°. There are a spread of Ge–O bond distances ranging from 1.73–1.81 Å. In the third Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two equivalent NaO5 square pyramids, corners with three GeO4 tetrahedra, and a cornercorner with one NaO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 40°. There are a spread of Ge–O bond distances ranging from 1.73–1.81 Å. In the fourth Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one NaO6 octahedra, a cornercorner with one NaO5 square pyramid, corners with three GeO4 tetrahedra, and an edgeedge with one NaO5 square pyramid. The corner-sharing octahedral tilt angles are 57°. There are a spread of Ge–O bond distances ranging from 1.72–1.81 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the third O2- site, O2- is bonded to four Na1+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing ONa4Ge trigonal bipyramids. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+ and two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the sixth O2- site, O2- is bonded to four Na1+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing ONa4Ge trigonal bipyramids. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Na1+ and two Ge4+ atoms. In the eighth O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one Ge4+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms. In the tenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na4Ge5O12 by Materials Project

Na4Ge5O12 crystallizes in the trigonal P3 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.27 Å) and three longer (2.35 Å) Na–O bond lengths. In the second Na1+ site, Na1+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.21 Å) and three longer (2.58 Å) Na–O bond lengths. In the third Na1+ site, Na1+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.22 Å) and three longer (2.61 Å) Na–O bond lengths. In the fourth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.27 Å) and three longer (2.38 Å) Na–O bond lengths. There are five inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to six O2- atoms to form a mixture of distorted face and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 29°. There are three shorter (1.81 Å) and three longer (2.21 Å) Ge–O bond lengths. In the second Ge4+ site, Ge4+ is bonded to six O2- atoms to form a mixture of distorted face and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 31°. There is three shorter (1.94 Å) and three longer (1.98 Å) Ge–O bond length. In the third Ge4+ site, Ge4+ is bonded in a 6-coordinate geometry to six O2- atoms. There is three shorter (1.94 Å) and three longer (1.98 Å) Ge–O bond length. In the fourth Ge4+ site, Ge4+ is bonded to six O2- atoms to form corner-sharing GeO6 octahedra. The corner-sharing octahedra tilt angles range from 28–29°. There is three shorter (1.92 Å) and three longer (1.94 Å) Ge–O bond length. In the fifth Ge4+ site, Ge4+ is bonded to six O2- atoms to form distorted corner-sharing GeO6 octahedra. The corner-sharing octahedra tilt angles range from 28–31°. There is three shorter (1.81 Å) and three longer (2.17 Å) Ge–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two Ge4+ atoms. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to one Na1+ and three Ge4+ atoms. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two Ge4+ atoms. In the fourth O2- site, O2- is bonded in a distorted see-saw-like geometry to one Na1+ and three Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2GeO10 by Materials Project

Na2GeO10 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 4-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.28–2.83 Å. In the second Na site, Na is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Na–O bond distances ranging from 2.30–2.99 Å. Ge is bonded in a distorted tetrahedral geometry to four O atoms. There are a spread of Ge–O bond distances ranging from 1.66–1.96 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Na and one O atom. The O–O bond length is 1.34 Å. In the second O site, O is bonded in a distorted trigonal planar geometry to two Na and one O atom. The O–O bond length is 1.34 Å. In the third O site, O is bonded in a distorted T-shaped geometry to two equivalent Na and one O atom. The O–O bond length is 1.35 Å. In the fourth O site, O is bonded in a distorted water-like geometry to one Ge and one O atom. In the fifth O site, O is bonded in a 4-coordinate geometry to three Na and one O atom. The O–O bond length is 1.35 Å. In the sixth O site, O is bonded in a distorted bent 150 degrees geometry to two Na and one Ge atom. In the seventh O site, O is bonded in a 3-coordinate geometry to two Na and one O atom. The O–O bond length is 1.33 Å. In the eighth O site, O is bonded in a distorted bent 120 degrees geometry to one Ge and one O atom. In the ninth O site, O is bonded in a water-like geometry to one Ge and one O atom. In the tenth O site, O is bonded in a 2-coordinate geometry to one Na and two O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2GeO9 by Materials Project

Na2GeO9 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Na–O bond distances ranging from 2.33–2.68 Å. In the second Na site, Na is bonded in a 3-coordinate geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.24–2.93 Å. Ge is bonded in a distorted trigonal bipyramidal geometry to five O atoms. There are a spread of Ge–O bond distances ranging from 1.70–2.29 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a water-like geometry to one Na and one Ge atom. In the second O site, O is bonded in a distorted trigonal planar geometry to one Na, one Ge, and one O atom. The O–O bond length is 1.49 Å. In the third O site, O is bonded in a trigonal non-coplanar geometry to two equivalent Na and one Ge atom. In the fourth O site, O is bonded in a 1-coordinate geometry to one Na, one Ge, and one O atom. The O–O bond length is 1.33 Å. In the fifth O site, O is bonded in a distorted bent 120 degrees geometry to two O atoms. The O–O bond length is 1.32 Å. In the sixth O site, O is bonded in a bent 120 degrees geometry to one Na and one O atom. The O–O bond length is 1.24 Å. In the seventh O site, O is bonded in a single-bond geometry to one O atom. In the eighth O site, O is bonded in a distorted trigonal planar geometry to two equivalent Na and one O atom. In the ninth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Na, one Ge, and one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaGeO3 by Materials Project

NaGeO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Na is bonded to twelve equivalent O atoms to form NaO12 cuboctahedra that share corners with twelve equivalent NaO12 cuboctahedra, faces with six equivalent NaO12 cuboctahedra, and faces with eight equivalent GeO6 octahedra. All Na–O bond lengths are 2.66 Å. Ge is bonded to six equivalent O atoms to form GeO6 octahedra that share corners with six equivalent GeO6 octahedra and faces with eight equivalent NaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ge–O bond lengths are 1.88 Å. O is bonded to four equivalent Na and two equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing ONa4Ge2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°.

36 MATERIALS SCIENCE↗