Ternary Crystals Sr1-yEu y-x2+Eu x3+F2+x of Fluorite Phases with a Variable Europium Valence and Their Thermal Conductivity (50-300 K)

被引：6

作者：

Karimov, D. N. ^{[1
]}

Popov, P. A. ^{[2
]}

Sorokin, N. I. ^{[1
]}

Sobolev, B. P. ^{[1
]}

机构：

[1] Russian Acad Sci, Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Moscow 119333, Russia

[2] Petrovsky Bryansk State Univ, Bryansk 241036, Russia

来源：

CRYSTALLOGRAPHY REPORTS | 2017年 / 62卷 / 03期

基金：

俄罗斯基础研究基金会;

关键词：

SOLID-SOLUTION CRYSTALS; RARE-EARTH-ELEMENTS; SINGLE-CRYSTALS; THERMOPHYSICAL CHARACTERISTICS; IONIC-CONDUCTIVITY; GROWTH; LA; PR; LU; YB;

D O I：

10.1134/S1063774517030105

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Crystals of new fluorite materials: ternary nonstoichiometric Sr0.9Eu0.0862+Eu0.0143+F2.014 and Sr0.5Eu0.4322+Eu0.0683+F2.068 phases with a structure of fluorite (CaF2) type, containing europium ions in different oxidation states (Eu2+, Eu3+), have been grown for the first time from a melt by the Bridgeman method. The variation in their thermal conductivity k(T) in a temperature range of 50-300 K has been experimentally studied. The equivalent cation positions with a large difference in cation masses (m(Sr) = 87.62 amu and m(Eu) = 151.96 amu) lead to low k(T) values of ternary (Sr1-yEuy-x2+Eux3+F2+x) and binary (Eu0.8642+Eu0.1363+F2.136) crystals. One can obtain crystals with thermal characteristics specified in a wide range by adjusting the ratio of strontium and europium (regardless of the valence). Since the thermal conductivity of Sr0.5Eu0.4322+Eu0.0683+F2.068 and Eu0.8642+Eu0.1363+F2.136 is independent of temperature in the range of 200-300 K, they can be recommended as reference materials with k(T) = const.

引用

页码：411 / 415

页数：5

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