High-pressure synthesis and thermal decomposition of LaCuO3

被引:18
作者
Karppinen, M
Yamauchi, H
Ito, T
Suematsu, H
Fukunaga, O
机构
[1] HELSINKI UNIV TECHNOL,INORGAN & ANALYT CHEM LAB,FIN-02150 ESPOO,FINLAND
[2] TOKYO INST TECHNOL,DEPT INORGAN MAT,MEGURO KU,TOKYO 152,JAPAN
来源
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 1996年 / 41卷 / 01期
关键词
oxygen pressure; rhombohedral structure; X-ray diffraction;
D O I
10.1016/S0921-5107(96)01624-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The high-pressure synthesis of the rhombohedral LaCuO3 perovskite has been studied and optimized in terms of the applied pressure and temperature, the synthesis time and the amount of the oxidizer. Essentially single phase samples were obtained at temperatures above 1400 degrees C under an oxygen pressure of 5 GPa. The high oxygen pressures were generated using excess amounts of KClO4 as an external oxidizing agent. Upon heating under ambient pressure the stoichiometric high-pressure form of LaCuO3-y loses oxygen yielding various oxygen-deficient phases, and finally decomposes into La2CuO4 and CuO or Cu2O at approximately 800 degrees C.
引用
收藏
页码:59 / 62
页数:4
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