EFFECTS OF HEAT TREATMENT ON Pb-DOPED Bi-2223 SUPERCONDUCTOR
ZHANG Liuwan; CHEN Tingguo; XIE Xiaoming; WU Xiaochu; SHITiansheng(Shanghai Institute of Metallurgy; Chinese Academy of Sciences;Shanghai 200050) LI Xiangting; GAO Jianhua; SUN Jing(Shanghai Institute of Ceramics;Chinese Academy of Sciences; Shanghai 200050)
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ZHANG Liuwan; CHEN Tingguo; XIE Xiaoming; WU Xiaochu; SHITiansheng(Shanghai Institute of Metallurgy; Chinese Academy of Sciences;Shanghai 200050) LI Xiangting; GAO Jianhua; SUN Jing(Shanghai Institute of Ceramics;Chinese Academy of Sciences; Shanghai 200050). EFFECTS OF HEAT TREATMENT ON Pb-DOPED Bi-2223 SUPERCONDUCTOR. Acta Metall Sin, 1995, 31(6): 277-285.
Abstract The annealing effects on the Pb-doped BPSCCO 2223 phase were studied by in situ electric resistivity measurement, XRD, TGA, TEM and EPMA. Annealing at hight temperature ranging from 650℃ to 800℃under higher oxygen pressure will incur the precipitaion of a Ca_2PbO_4-modified phase. and the impurity phase would be decomposed upon annealing under lower oxygen pressure. With the formation of the impurity phase, the sample's mass and resistivity are increased. and the modulated structure is changed from pure Pb-type to pure Bi-type. While the impurity is decomposed, the mass and the resistiviey of the sample are decreased. and the modulated structure is back to original Pb-type. In addition, the proper amount of precipitation of the Ca_2PbO_4-modified phase has a positive influence on both superconductivity and the weak links between the superconducting grains.
SHI Fan;ZHOU Shouzeng;SHI Zhenhua;LI Fubiao Beijing University of Iron and Steel TechnologyDepartment of Materials Science and Engineering;Beijing University of Iron and Steel Technology; Beijing. Bi-Sr-Ca-Cu OXIDE SUPERCONDUCTOR WITH ZERO RESISTANCE TEMPERATURE 85.3K[J]. 金属学报, 1988, 24(4): 371-372.
