ND(1+X)BA(2-X)CU3O(Y) PROCESSED IN HIGH-PRESSURE OXYGEN - EFFECTS OF ENHANCED OXYGEN-UPTAKE ON STRUCTURE AND SUPERCONDUCTIVITY

被引：13

作者：

SINGH, KK

MORRIS, DE

SINHA, APB

机构：

[1] Morris Research Inc., Berkeley, CA 94704

来源：

PHYSICA C | 1994年 / 224卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90259-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The T(c) of Nd1+xBa2-xCu3Oy (0.1 less-than-or-equal-to x less-than-or-equal-to 0.6) has been increased by synthesizing and annealing the compounds in 200 bar oxygen pressure. The oxygen content, y, increases to compensate the effect of Nd'' substitution and the formal average copper valence (FACV) remains unchanged at approximately 2.3 throughout the composition range. Although the FACV remains constant, T(c) falls systematically with increasing x, suggesting that Nd3+ at the Ba2+ site binds a portion of holes. Thermogravimetric data show an increasingly negative slope of the weight-temperature plot with larger x, indicating that the enthalpy for binding the oxygen in the CuO chain increases when oxygen per formula unit increases beyond seven.

引用

页码：231 / 239

页数：9

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