SYNTHESIS OF HIGH-QUALITY THALLIUM SUPERCONDUCTORS AT ELEVATED OXYGEN-PRESSURE

被引：11
作者：
MORRIS, DE [1 ]
CHANDRACHOOD, MR [1 ]
SINHA, APB [1 ]
机构：
[1] UNIV CALIF BERKELEY,DEPT MAT SCI & ENGN,BERKELEY,CA 94720
来源：
PHYSICA C | 1991年 / 175卷 / 1-2期
关键词：
D O I：
10.1016/0921-4534(91)90246-U
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Preparation of thallium superconductors at pressures up to 200 bar is reported. We find that thallium loss can be completely suppressed, so that samples can be heated for long durations to ensure complete reaction and densification without loss of thallium. The relative phase fractions of Tl2Ba2CuO6 (2201), Tl2Ba2Ca1Cu2O8 (2212) and Tl2Ba2Ca2Cu3O10 (2223) are found to depend upon (a) starting composition (b) temperature of reaction/sintering (c) total pressure and (d) oxygen partial pressure. Phase fractions were determined by X-ray powder diffraction. SQUID magnetization data reveal high superconducting volume fraction and sharp transitions. These dense, textured, polycrystalline high temperature superconductors show high critical current values (determined magnetically) which approach those of single crystal and oriented thin films.
引用
收藏
页码：156 / 164
页数：9
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