PHASE-STABILITY IN THE LA-BA-CU-O SYSTEM AT 98O-DEGREES-C AND 200-BAR OXYGEN-PRESSURE

被引：7

作者：

CHANDRACHOOD, MR ^{[1
]}

SINGH, KK ^{[1
]}

MORRIS, DE ^{[1
]}

SINHA, APB ^{[1
]}

机构：

[1] MORRIS RES INC,BERKELEY,CA 94704

来源：

PHYSICA C | 1995年 / 241卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)02317-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The LaO1.5-BaO-CuO pseudo-ternary phase diagram at 200 bar oxygen pressure was explored by a solid-state reaction at 980 degrees C of numerous compositions. The phases which formed have been identified by X-ray diffraction. Significant differences from phases formed in air are noticed. BaCuO2 and Ba2CuO2 are absent, Ba2CU3O5+delta is stabilized. La2CuO4 remains stable, in addition LaCuO3 is formed in high pressure. Both La2CuO4 and LaCuO, show an extended solubility with Ba2+ replacing La3+. The following phases do not form in a high P(O-2): LaBa2Cu3O7, LaBa2Cu4O8, La4BaCu5O13, La3Ba3Cu6O10, La2BaCu2O6 and La2BaCuO5. This is possibly because LaCuO3 is a highly oxidized phase (FCV approximate to 3.0), which is therefore strongly favored at elevated P(O-2) of 200 bar. Tie-lines have been worked out and a tentative phase diagram is presented.

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页码：319 / 322

页数：4

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