LITHIUM DISORDER IN THE VICINITY OF THE SUPERIONIC PHASE-TRANSITION IN MONOCLINIC AND RHOMBOHEDRAL LI3IN2(PO4)(3)

被引：4

作者：

KRAVCHENKO, VV ^{[1
]}

SIGARYOV, SE ^{[1
]}

机构：

[1] RUSSIAN ACAD SCI,INST CRYSTALLOG,MOSCOW 117333,RUSSIA

来源：

JOURNAL OF MATERIALS SCIENCE | 1994年 / 29卷 / 22期

关键词：

D O I：

10.1007/BF00366886

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rhombohedral and monoclinic modifications of the Li3In2(PO4)(3) compound have been studied by X-ray diffraction, infrared (i.r.) analysis, Raman light scattering, differential thermal analysis (DTA), differential scanning calorimetry (DSC) and impedance spectroscopy, in a wide temperature range of 290-600 K. Analysis of the data allows the suggestion that the superionic phase transition, observed in these materials in the temperature interval 370-385 K, belongs to Faraday type phase transformations. PO4 tetrahedra, which are a partition of the (In2P3O12)(300)(3-) rigid skeleton, have been found deformed. This seems to be due to an ordered lithium ion-vacancy distribution in the low temperature, non-superionic, polymorphs. With increasing temperature these deformations disappear, This disappearance can be caused by a decrease of the correlation length of the lithium ion-vacancy order.

引用

页码：6004 / 6010

页数：7

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