Phase equilibria in the Pr-Ba-Cu-O system under varied oxygen partial pressures

被引：43

作者：

Park, M ^{[1
]}

Kramer, MJ ^{[1
]}

Dennis, KW ^{[1
]}

McCallum, RW ^{[1
]}

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011

来源：

PHYSICA C | 1996年 / 259卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(96)00006-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Phase equilibria in the Pr-Ba-Cu-O system under varied oxygen partial pressure (pO(2)) is investigated. Stoichiometric PrBa2Cu3O7-delta (Pr123) does not exist for pO(2) < 1 bar O-2. Instead, nominal Pr123 is a mixture of Pr1+xBa2-xCu3O7+delta solid-solution (Pr123(55)) and BaCuO2. When nominal Pr123 is processed at 900 degrees C in 1 bar O-2, the lower limit for x is 0.04. As the pO(2) is lowered, the occupancy of the Pr ions on the Pa sites is decreased. The minimum lower limit of x is similar to 0.01 at 900 degrees C using a pO(2) of 0.001 atm. Further reducing the pO(2) causes the BaCu2O2 and PrBaO3 phases to form.

引用

页码：43 / 53

页数：11

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