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Bi-Sr-Ca-Cu-O体系中的单斜相与掺Ba效应的研究

毛志强 韩智毅 王瑜 杨丽 卢江 范成高 周贵恩 陈兆甲 张裕恒

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Bi-Sr-Ca-Cu-O体系中的单斜相与掺Ba效应的研究

毛志强, 韩智毅, 王瑜, 杨丽, 卢江, 范成高, 周贵恩, 陈兆甲, 张裕恒

STUDY OF THE MONOCLINIC PHASE AND EFFECT OF Ba-DOPING IN Bi-Sr-Ca-Cu-O SYSTEM

Mao Zhi-qiang, Han Zhi-yi, Wang Yu, Yang Li, Lu Jiang, Fan Cheng-gao, Zhou Gui-en, Chen Zhao-jia, Zhang Yu-heng
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  • 采用固相反应法合成名义组份为Bi2Sr2Ca1-xBaxCu2Oy(A),Bi1.7Pb0.3Sr2Ca2-xBaxCu3Oy(B)的样品。此样品的物相和结构分析表明:在Bi系中存在着一种新的单斜相,其晶胞参量为a=24.8
    The sample with the nominal composition Bi2Sr2Ca1-xBaxCu2Oy(A),Bi1.7Pb0.3Sr2Ca2-xBaxCu3Oy(B) were synthesized by solid state reaction. The analyses of phases and structure of the samples showed that a new kind of monoclinic phase exists in Bi-system with cell dimension a=24.84?, b=6.29?, c = 20.70?, β=114.2?. There exists special relation between the monoclinic phase and the superconducting property of Bi system. For 2212 phase, the diamagnetic transition at 95K was observed when the monolinic phase co-existed with 2212 phase, furthermore the addition of Ba ions facilitated the formation of the monoclinic phase. For Ba-doped 2223 phase, the study of electron diffraction indicated that Ba ions got into the 2223 phase and caused the change of crysral micro-structure of 2223 phase, a new additional superstructure appeared along b axis, and two kinds of modulation mode were observed simultaneously along this direction, the wavelength of which is 27?, 43? respectively. The measurement of physical property showed that the zero resistance temperature of the samples can reach as high as 113-114K by proper doping of Ba ions, and the diamagnetic transtion at 118K was also observed. This kind of increasing of the critical temperature of 2223 phase may be related to changes of its crystal microstructure.
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  • 收稿日期:  1990-07-23
  • 刊出日期:  2005-07-01

Bi-Sr-Ca-Cu-O体系中的单斜相与掺Ba效应的研究

  • 1. (1)中国高等科学技术中心(世界实验室); (2)中国科学技术大学结构分析开放研究实验室,合肥,230026; (3)中国科学技术大学物理系

摘要: 采用固相反应法合成名义组份为Bi2Sr2Ca1-xBaxCu2Oy(A),Bi1.7Pb0.3Sr2Ca2-xBaxCu3Oy(B)的样品。此样品的物相和结构分析表明:在Bi系中存在着一种新的单斜相,其晶胞参量为a=24.8

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