Materials Data on Nb2Ge2O7 by Materials Project
Nb2Ge2O7 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. there are two inequivalent Nb3+ sites. In the first Nb3+ site, Nb3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.84–2.40 Å. In the second Nb3+ site, Nb3+ is bonded to six O2- atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 20°. There are a spread of Nb–O bond distances ranging from 1.91–2.18 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are one shorter (1.88 Å) and two longer (2.26 Å) Ge–O bond lengths. In the second Ge4+ site, Ge4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Ge–O bond distances ranging from 2.01–2.31 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to two equivalent Nb3+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb3+ atoms. In the third O2- site, O2- is bonded in a distorted see-saw-like geometry to two Nb3+ and two equivalent Ge4+ atoms. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Nb3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to one Nb3+ and two equivalent Ge4+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Nb3+ and one Ge4+ atom. In the seventh O2- site, O2- is bonded in a distorted T-shaped geometry to two equivalent Nb3+ and one Ge4+ atom.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). LBNL Materials Project
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Organization:
- MIT; UC Berkeley; Duke; U Louvain
- DOE Contract Number:
- AC02-05CH11231; EDCBEE
- OSTI ID:
- 1289609
- Report Number(s):
- mp-754857
- Resource Relation:
- Related Information: https://materialsproject.org/citing
- Country of Publication:
- United States
- Language:
- English
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