| 准静水冷压处理后的Bi0.8Pb0.2SrCaCu2Ox超导材料 |
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| 引用本文： | 吴冰青,王文魁,靳常青,刘维,李方华,刘世超,刘振兴,赵忠贤,姚玉书.准静水冷压处理后的Bi0.8Pb0.2SrCaCu2Ox超导材料[J].物理学报,1992,41(12):1993-2002. |
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| 作者姓名： | 吴冰青 王文魁 靳常青 刘维 李方华 刘世超 刘振兴 赵忠贤 姚玉书 |
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| 作者单位： | (1)中国科学院表面物理国家重点实验室,北京100080; (2)中国科学院超导国家重点实验室,北京100080; (3)中国科学院物理研究所,北京100080 |
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| 基金项目： | 国家超导技术联合研究开发中心资助的课题 |
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| 摘 要： | 着重讨论了准静水冷压对Bi系高温超导材料超导电性的影响,并分析了经冷压-退火处理后超导电性的改善情况。准静水冷压处理后,Bi系超导材料晶粒间界连接发生显著退化,晶粒内部产生大量缺陷,由此导致了宏观超导电性的退化。冷压造成了体密度的极大提高和一定的晶粒择优取向。这些现象主要是由于准静水压下剪切应力的作用。退火后,晶界连接得到很大加强,部分缺陷消失或形成堆错使材料各项性能均获改善。Jc(77K,零场)较初始样品有大幅度提高,达约1600A/cm2。此外还考察了静水压
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| 关 键 词： | 超导材料 铋 冷压 高温超导性 |
| 收稿时间： | 1991-12-11 |
QUASI-HYDROSTAT1CALLY COLD-PRESSED Bi0.8Pb0.2SrCaCu2Ox SUPERCONDUCTORS |
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| WU BING-QING,WANG WEN-KUI,JIN CHANG-QING,LIU WEI,LI FANG-HUA,LIU SHI-CHAO,LIU ZHEN-XING,ZHAO ZHONG-XIAN and YAO YU-SHU.QUASI-HYDROSTAT1CALLY COLD-PRESSED Bi0.8Pb0.2SrCaCu2Ox SUPERCONDUCTORS[J].Acta Physica Sinica,1992,41(12):1993-2002. |
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| Authors: | WU BING-QING WANG WEN-KUI JIN CHANG-QING LIU WEI LI FANG-HUA LIU SHI-CHAO LIU ZHEN-XING ZHAO ZHONG-XIAN and YAO YU-SHU |
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| Abstract: | The effects of quasi-hydrostatic pressure treatments on the Bi-system superconductors were investigated The cold-pressing treatments seriously weakened the inter-granular weaklinks and induced a large number of intragranular defects, resulting in the deterioration of the suprcon-ducting properties. The targe increase in the bulk density and the orientation of the superconducting grains were also observed in the cold-pressed samples. These drastic changes of superconductivity were mainly due to the shear stress under quasi-hydrostatic pressure. The post annealing treatments greatly enhanced the weaklinks and caused the partial recovery and the agglomeration of some defects. By coldpressing-annealing method, Jc (77 K, zero field) was raised to about 1600A/cm2. The pressure dependence of Tc under hydrostatic pressure was also investigated and dTc/dp was found to be 1.4K/GPa. |
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