Hydrothermal investigations in the high-silica region of the K2O-Nd2O3-SiO2 system, carried out in a search for novel fast-ion conductors (FICs), yielded the new compound tripotassium neodymium heptasilicate, K3NdSi7O17. Single-crystal X-ray methods revealed that K3NdSi7O17 crystallizes in space group P3, has lattice constants a = 16.131 (2) and c = 7.7146 (19) Å, Z = 4, and 22 atoms in the asymmetric unit. Refinement was carried out to a residual. R(F), of 0.0253 and a weighted residual, wR(F2), of 0.0702 using anisotropic displacement parameters for all atoms. The silicate anion forms an interrupted framework, within which both Nd octahedra and K polyhedra are situated. The structure is unusual in that it contains a symmetry-constrained Si-O-Si bond angle of 180°. No isomorphs to K3NdSi7O17 are known.
|Original language||English (US)|
|Number of pages||7|
|Journal||Acta Crystallographica Section B: Structural Science|
|State||Published - Oct 2000|
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)