Structure of Na_3YSi_6O_(15) - a Unique Silicate Based on Discrete Si_6O_(15) Units, and a Possible Fast-Ion Conductor
Abstract
Hydrothermal investigations in the high silica region of the Na₂O-Y₂0₃-Si₆O₁₅ system, carried out in a search for novel fast-ion conductors (FIC's), yielded the new compound trisodium yttrium hexasilicate, Na₃YSi₆O₁₅. Single-crystal X-ray methods revealed that Na₃YSi₆O₁₅ crystallizes in space group Ibmm, has lattice constants a=10.468 (2), b=15.2467 (13) and c=8.3855 (6) Å, Z=4, and 11 atoms in the asymmetric unit. Refinement was carried out to a weighted residual of 3.53% using anisotropic temperature factors for all atoms. The structure is unique in that the silica tetrahedra form isolated SiSi₆O₁₅⁶⁻ double dreier-rings, rather than layers as might be expected from the Si to O ratio of 0.4. No isomorphs to Na₃YSi₆O₁₅ have been reported.
Additional Information
© 1995 International Union of Crystallography. (Received 25 July 1994; accepted 5 December 1994). We are indebted to Dr Peter Hohn of the Max-Planck Institut fiir Festkorperforschung for providing single crystal intensity data and to Eva-Marie Peters for assistance with the structure determination. We thank Mike Jercinovic of the Massachusetts Institute for Technology for supplying microprobe analyses and Ortrud Buresch of the Max-Planck-Institut fur Festkorperforschung for performing the plasma spectroscopy. SH is grateful to the AT&T Cooperative Fellowship Program, the Fulbright Foundation and the Alexander von Humboldt Foundation for providing financial support at various stages of this research.Attached Files
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Additional details
- Alternative title
- Structure of Na3YSi6O15 - a Unique Silicate Based on Discrete Si6O15 Units, and a Possible Fast-Ion Conductor
- Alternative title
- Structure of Na₃YSi₆O₁₅ - a Unique Silicate Based on Discrete Si6O15 Units, and a Possible Fast-Ion Conductor
- Eprint ID
- 42701
- DOI
- 10.1107/S0108768195005684
- Resolver ID
- CaltechAUTHORS:20131125-160716104
- AT&T Cooperative Fellowship
- Fulbright Foundation
- Alexander von Humboldt Foundation
- Created
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2013-12-03Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field