The phase stability of La0.5Sr0.5CoO3-delta

被引：40

作者：

Morin, F ^{[1
]}

Trudel, G ^{[1
]}

Denos, Y ^{[1
]}

机构：

[1] CERSTA,GAZ FRANCE,DIV COMBUST & PILES COMBUSTIBLE,F-93211 LA PLAINE ST DENI,FRANCE

来源：

SOLID STATE IONICS | 1997年 / 96卷 / 3-4期

关键词：

phase stability; strontium-substituted lanthanum cobaltite; cation ratios; perovskite oxides;

D O I：

10.1016/S0167-2738(97)00002-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In preparing ABO(3) compounds with A = La and Sr and B = Co or Mn, it has been found that strontium-substituted lanthanum cobaltite, La1-xSrxCoO3-delta, has much less tolerance for any variation in the A/B ratio than its manganite counterpart. This is specifically demonstrated for La0.5Sr0.5CoO3-delta where distinct phases readily appear on either sides of the A/B ratio for any small departure of this ratio from unity. These secondary phases are clearly evidenced by scanning electron microscopy and X-ray diffraction. The same observations have been extended to various degrees of strontium substitution between 0.4 less than or equal to x less than or equal to 0.6. Additional data in regard to the main phase stability as a function of the oxygen partial pressure at temperatures up to 1425 degrees C have also been gathered. The (La1-ySry)(2)CoO4-phase formed in this latter case is very similar to that due to the unbalance in the A/B ratio.

引用

页码：129 / 139

页数：11