SYNTHESIS AND CHARACTERIZATION OF YBACUO SUPERCONDUCTORS FROM SOLUTIONS IN LIQUID-AMMONIA

被引：2

作者：

SCHAEFFER, RW

MACHO, J

SALOMON, RE

MYER, G

CROW, JE

PERNAMBUCOWISE, P

机构：

[1] Center for Materials Research, Temple University, Philadelphia, 19122, Pennsylvania

[2] MARTECH Center for Materials Research and Technology, Florida State University, Tallahassee, 32306-3016, Florida

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1991年 / 4卷 / 05期

关键词：

SUPERCONDUCTOR SYNTHESIS; LIQUID AMMONIA; SOLUTION PYROLYSIS; FREEZE DRYING; CHEMICAL SOLIDIFICATION;

D O I：

10.1007/BF00618218

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

YBa2Cu3O7-x (123) superconducting powders have been advantageously prepared from liquid ammonia solutions of nitrate, acetate, and perchlorate precursors. The synthetic techniques used include solution pyrolysis, freeze drying, and chemical solidification by reaction with a Lewis acid. Metal stoichiometry was determined by gravimetric analysis and atomic absorption spectroscopy. Phase characterization was accomplished by powder X-ray diffraction which revealed at least 98% pure 123 for some samples. Resistivity and magnetic susceptibility measurements confirm the superconducting properties of the products with critical temperatures around 90 K. Finally, chemical and superconducting properties are discussed as a function of process parameters.

引用

页码：365 / 374

页数：10

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