Structure, Linear Thermal Expansion Coefficient, and Electrical Conductivity of Y0.9Ca0.1Cr1-?Co?O3 (?=0-0.9) Perovskites

被引：0
作者：
Gil'derman, V. K. [1 ]
Antonov, B. D. [1 ]
机构：
[1] Russian Acad Sci, Inst High Temp Electrochem, Ural Branch, Ekaterinburg 620990, Russia
来源：
CRYSTALLOGRAPHY REPORTS | 2019年 / 64卷 / 03期
关键词：
DOPED YTTRIUM CHROMITES; DEFECT CHEMISTRY; STABILITY; CALCIUM;
D O I：
10.1134/S1063774519030076
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The structure, thermal expansion coefficient, and electrical conductivity of Y0.9Ca0.1Cr1-?Co?O3 (? = 0-0.9) compounds with the perovskite structure have been investigated in air in the temperature range of 100-1000 degrees C. The linear thermal expansion coefficient of Y1-?Ca?Cr1-?Co?O3 lies in the range of (8.77-16.1) x 10(-6) K-1. The maximum electrical conductivity is attained for the Y0.9Ca0.1Cr0.6Co0.4O3 composition. It is shown that the electrical conductivity at low (25-270 degrees C) temperatures and weak substitution of cobalt for chromium is mainly due to the hopping of one electron hole from Cr4+ to Cr3+. At high (565-1000 degrees C) temperatures and cobalt contents, this conductivity mechanism is supplemented with the conductivity caused by the hopping of an electron hole from C3+ to C2+.
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页码：474 / 478
页数：5
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