X-ray diffraction study of K3NdSi7O17: A new framework silicate with a linear Si-O-Si bond

S. M. Haile*, B. J. Wuensch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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 languageEnglish (US)
Pages (from-to)773-779
Number of pages7
JournalActa Crystallographica Section B: Structural Science
Issue number5
StatePublished - Oct 2000

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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