STRUCTURE REFINEMENT OF RUBIDIUM-NIOBYL AND THALLIUM-NIOBYL DIPHOSPHATES - COMPARISON WITH RELATED-COMPOUNDS

Authors
FAKHFAKH M OYETOLA S JOUINI N VERBAERE A PIFFARD Y
Citation
M. Fakhfakh et al., STRUCTURE REFINEMENT OF RUBIDIUM-NIOBYL AND THALLIUM-NIOBYL DIPHOSPHATES - COMPARISON WITH RELATED-COMPOUNDS, Materials research bulletin, 29(1), 1994, pp. 97-105
Citations number
20
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
29
Issue
1
Year of publication
1994
Pages
97 - 105
Database
ISI
SICI code
0025-5408(1994)29:1<97:SRORAT>2.0.ZU;2-Z
Abstract
The crystal structures of ANbOP(2)O(7) (A = Rb, Tl) compounds (space g roup P2(1/n)) were refined, showing three dimensional [NbOP2O7-]n fram eworks more or less closely related to that of KNbOP2O7. The Tl one is significantly distorted. These frameworks, built up from NbO6 octahed ra and P2O7 diphosphate groups sharing corners form large tunnels wher ein the A(+) ions are situated. A discussion of all structures, includ ing the bidimensional CsNbOP2O7 one, presents evolutions related to th e size and polarizability of the A(+) ion.