OXYGEN NONSTOICHIOMETRY OF 2223-PHASE BI-PB-SR-CA-CU-O SYSTEM SUPERCONDUCTING OXIDE

被引：62
|
作者：
IDEMOTO, Y
ICHIKAWA, S
FUEKI, K
机构：
[1] Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Noda-shi, Chiba, 278
来源：
PHYSICA C | 1991年 / 181卷 / 1-3期
关键词：
D O I：
10.1016/0921-4534(91)90351-X
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The oxygen nonstoichiometry of Bi1.74Pb0.27Sr1.86Ca2.09Oy (2223 phase) was determined as a function of temperature and oxygen partial pressure under the condition that Ca2PbO4 was not formed. It was also found that PbO evaporated from the 2223 phase about 700-degrees-C in a low oxygen pressure range. Below about 700-degrees-C, the dependences of oxygen content on both temperature and oxygen partial pressure were weak, whereas they were strong above 700-degrees-C. The effect of PbO content on properties of the 2223 phase was studied by allowing PbO to evaporate under 500-degrees-C and 800-degrees-C in oxygen of 0.01 atm for different annealing periods. It was found that the critical temperature and the valences of copper and bismuth remained constant in spite of a loss of PbO.
引用
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页码：171 / 178
页数：8
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