Effect of oxygen partial pressure on the neodymium solubility in Ba-Cu-O solvent

被引：41

作者：

Nakamura, M ^{[1
]}

Kambara, M ^{[1
]}

Umeda, T ^{[1
]}

Shiohara, Y ^{[1
]}

机构：

[1] UNIV TOKYO,FAC ENGN,DEPT MET,BUNKYO KU,TOKYO 113,JAPAN

来源：

PHYSICA C | 1996年 / 266卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(96)00311-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The neodymium (Nd) solubility in Ba-Cu-O solvent with a Ba to Cu ratio of 3 to 5 was investigated under different oxygen partial pressures (P(O-2) = 1, 21, 100%). A small amount of the solution was taken out by dipping thermally equilibrated MgO single crystals, and compositions of these specimens stuck with liquid on the MgO, were analyzed by inductively coupled plasma spectrometry (ICP). Sampling the solution for ICP analysis was performed in the temperature range from approximately 1000 degrees C up to 1200 degrees C. The peritectic temperature of NdBa2Cu3O7-delta (Nd123) increased with increasing oxygen partial pressure. The Nd solubility at the peritectic temperature of Nd123 increased with increasing oxygen partial pressure. The slope of the Nd123 liquidus lines near the peritectic temperature decreased with increasing oxygen partial pressure. Assuming a regular solution, expressions for the solubility and the enthalpy of dissolution of Nd123 and Nd4Ba2Cu2O10 (Nd422) were derived from classical thermodynamic calculations. The enthalpies of dissolution Delta H-diss for Nd123 and Nd422 decreased with increasing oxygen partial pressure.

引用

页码：178 / 182

页数：5

共 15 条

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