Sintering mechanisms in strontium doped lanthanum chromite

被引：42
|
作者：
Simner, S [1 ]
Hardy, J [1 ]
Stevenson, J [1 ]
Armstrong, T [1 ]
机构：
[1] Pacific NW Lab, Dept Chem & Mat Sci, Richland, WA 99352 USA
来源：
JOURNAL OF MATERIALS SCIENCE | 1999年 / 34卷 / 23期
关键词：
Shrinkage; Strontium; Lanthanum; Chromite; Decomposition Reaction;
D O I：
10.1023/A:1004745915378
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The sintering behavior of (La0.7Sr0.3)(x)CrO3 (0.95 less than or equal to x less than or equal to 1.05) is investigated to compare liquid phase sintering phenomena occuring in stoichiometric and non-stoichiometric compositions. Shrinkage analysis revealed marked contrast between the densification characteristics of the A-site enriched (x > 1.00) and A-site depleted (x < 1.00) materials. A-site depleted samples typically exhibited a single liquid phase sintering event at 1250 degrees C attributed to the melting of an exsoluted SrCrO4 phase. A-site enriched samples indicated two rapid shrinkage events due to the melting of SrCrO4, and a Sr-2.67(CrO4)(2) phase with a melting temperature of 1450 degrees C. Sr-2.67(CrO4)(2) was shown to evolve from a decomposition reaction between SrCrO4 and La2CrO6, detected together in A-site enriched samples from 800-1000 degrees C. Maximum densities (93% theoretical density) were achieved for (La0.7Sr0.3)(x)CrO3 x = 1.00 after sintering at 1700 degrees C for two hours. (C) 1999 Kluwer Academic Publishers.
引用
收藏
页码：5721 / 5732
页数：12
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