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Bi系超导体高Tc相的形成机制

裘新良 辛绵荣 罗长勋 李成仁

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Bi系超导体高Tc相的形成机制

裘新良, 辛绵荣, 罗长勋, 李成仁

THE FORMATION MECHANISM OF HIGH-Tc PHASE IN Bi-BASED SUPERCONDUCTOR

QIU XIN-LIANG, LI CHENG-REN, XIN MIAN-RONG, LUO CHANG-XUN
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  • 本文研究Bi系超导体高Tc(2223)相的形成机制。提出Bi系氧化物超导体高Tc相的形成过程是:首先Sr-Ca-Cu氧化物(Ca0.85Sr0.15CuO2)与低Tc(2212)相反应形成高Tc相的核,然后样品内2223相核通过象结晶学中晶体生长那样的方式长大成2223相晶粒。2223相成核过程中Sr-Ca-Cu氧化物的形成途径有两条:一条是通过固相反应
    In this paper, the formation process of high-Tc phase in Bi-based supercondutor is investigated by X-ray diffraction etc. The high-Tc phase might be formed in the following manner. At first, the nuclei of hig-Tc (2223) phase are formed by the reaction of Sr-Ca-Cu oxide with low-Tc (2212) phase; Then the nuclei of 2223 phase grows, following the manner of ordinary crystal growth. There are two ways to form Sr-Ca-Cu oxide. One is accomplished by solid state reaction between Ca2CuO3 and Ca3(1-x)Sr3xCu5O8, and the other by liquid-state reaction of Ca2PbO4, 2212 phase and CuO. The liquid-state reaction rate is much quicker than that of solid state reaction. So, the rate of formation of 2223 nuclei can be accderated in liquid-state reaction. Based on this mechanism, we propose that Pb can only accelerate the nucleation of 2223 phase and exert no significant influence on the growth of 2223 phase.
    • 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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  • 文章访问数:  6425
  • PDF下载量:  537
  • 被引次数: 0
出版历程
  • 收稿日期:  1991-04-11
  • 刊出日期:  1992-02-05

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