Studies of chemical diffusion in La1-xSrxCo3-delta

被引：7

作者：

Kononchuk, OF

Norby, T

Kofstad, P

机构：

[1] Centre for Materials Research, University of Oslo, N-0371 Oslo

来源：

PHASE TRANSITIONS | 1996年 / 58卷 / 1-3期

关键词：

chemical diffusion; thermogravimetry; strontium-doped lanthanum cobaltates; defect structure;

D O I：

10.1080/01411599608242399

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Chemical diffusion in La1-xSrxCoO3-delta with x = 0.3 and 0.6 has been studied by transient thermogravimetry in the temperature range 620-1100 degrees C and at oxygen partial pressures from 1 to 1.6 . 10(-4) arm. In view of the defect structure of La1-xSrxCoO3-delta the chemical diffusion is concluded to reflect diffusional transport of oxygen vacancies. The transient kinetics indicate that the chemical diffusion comprises one diffusion process at near-atmospheric oxygen pressures and two diffusion processes at reduced oxygen pressures. This behaviour may reflect that microdomains of ordered structures are formed as the oxygen vacancy concentration increases with decreasing oxygen activity/oxygen deficiency.

引用

页码：145 / 157

页数：13

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