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- Title
Crystallochemical modeling, synthesis, and study of new tantalum and niobium phosphates with a framework structure.
- Authors
Orlova, A. I.; Koryttseva, A. K.; Bortsova, E. V.; Nagornova, S. V.; Kazantsev, G. N.; Samoilov, S. G.; Bankrashkov, A. V.; Kurazhkovskaya, V. S.
- Abstract
A crystallochemical approach is used to model the compositions of phosphates of pentavalent elements with the expected structure. New phosphates with a framework structure of the T T T (PO4)3 type ( T I = Na or K; T III = Al, Cr, or Fe; and T V = Nb or Ta) are synthesized and characterized by X-ray diffraction analysis (including high-temperature diffraction) and IR spectroscopy. It is established that, depending on the nature of the alkali cation (Na or K), these compounds are crystallized in two structural modifications: rhombohedral and cubic (sp. gr. R $$\bar 3$$ c and P213, respectively). The unit-cell parameters and the thermal expansion coefficients of the phosphates under study are determined and the dependences of these characteristics on the nature of cations are established.
- Subjects
SODIUM phosphates; POTASSIUM phosphates; X-ray diffraction; INFRARED spectra; THERMAL expansion; CRYSTALLOGRAPHY
- Publication
Crystallography Reports, 2006, Vol 51, Issue 3, p357
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774506030011