THE INFLUENCE OF OXYGEN PARTIAL-PRESSURE AND TEMPERATURE ON BI-PB-SR-CA-CU-O 110-K SUPERCONDUCTOR PHASE-FORMATION AND ITS STABILITY

被引：42

作者：

ZHU, W

NICHOLSON, PS

机构：

[1] Ceramics Research Group, Department of Materials Science and Engineering, McMaster University, Hamilton

来源：

JOURNAL OF APPLIED PHYSICS | 1993年 / 73卷 / 12期

关键词：

D O I：

10.1063/1.353412

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A systematic study of the influence of oxygen partial pressure on 110 K phase formation in the Bi-Pb-Sr-Ca-Cu-O system has been undertaken on the optimum nominal composition to promote the Bi2Sr2Ca2Cu3Ow (2223, 110 K) phase, i.e.; Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06Ow. The relationship between 110 K phase fraction, oxygen partial pressure, sintering temperature, and time has been mapped for this composition via experimental data. The optimum conditions for 110 K phase formation were identified as 0.01 less-than-or-equal-to P(O2) less-than-or-equal-to 0.35 atm, at 820 less-than-or-equal-to T less-than-or-equal-to 880-degrees-C for less-than-or-equal-to 36 h with intermediate grinding every 6 h. The single 110 K phase stability range was determined as P(O2) less-than-or-equal-to 0.5 atm. The variation of oxygen partial pressure during the 110 K phase formation process was monitored via a Y2O3-ZrO2 oxygen sensor and a possible mechanism for its formation and the effect of P(O2) thereon is discussed.

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页码：8423 / 8428

页数：6

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