Phases of variable composition in the Ca3(VO4)2-NdVO4-Na3VO4 system

被引：0
|
作者：
Leonidov, IA [1 ]
Leonidova, ON [1 ]
Surat, LL [1 ]
Kristallov, LV [1 ]
Perelyaeva, LA [1 ]
Samigullina, RF [1 ]
机构：
[1] Russian Acad Sci, Ural Div, Inst Solid State Chem, Ekaterinburg 620219, Russia
来源：
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2001年 / 46卷 / 02期
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D O I：
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中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Phase equilibria in the Ca-3(VO4)(2)-NdVO4-Na3VO4 system were studied. Phases of variable composition (PVCs) on the basis of calcium orthovanadate were found to be formed in the system. The PVC region lies in the Ca-3(VO4)(2)-Ca9Nd square (VO4)(7)-Ca10Na(VO4)(7)-Ca8NdNa2(VO4)(7) quadrangle (Z = 6). The boundary compositions are governed by the structure of the low-temperature phase of Ca-3(VO4)(2) (Z = 21, space group R3c). The occupancy factor for Ca(4) sites considerably affects the phase transition temperature, ionic conductivity, and IR and Raman spectra. A considerable increase in the calcium ion conductivity above 650 K is explained by order-disorder phase transition connected with the redistribution of structure vacancies (square) over various cationic sites.
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页码：268 / 273
页数：6
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