| Bi系超导体高Tc相的形成机制 |
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| 引用本文： | 裘新良,辛绵荣,罗长勋,李成仁.Bi系超导体高Tc相的形成机制[J].物理学报,1992,41(4):649-654. |
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| 作者姓名： | 裘新良 辛绵荣 罗长勋 李成仁 |
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| 作者单位： | (1)陕西师范大学物理系,西安,710062; (2)西北有色金属研究院,宝鸡,721014 |
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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： | 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
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| 关 键 词： | 铋 超导体 高Tc 相 形成 机制 |
| 收稿时间： | 1991-04-11 |
THE FORMATION MECHANISM OF HIGH-Tc PHASE IN Bi-BASED SUPERCONDUCTOR |
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| QIU XIN-LIANG,LI CHENG-REN,XIN MIAN-RONG and LUO CHANG-XUN.THE FORMATION MECHANISM OF HIGH-Tc PHASE IN Bi-BASED SUPERCONDUCTOR[J].Acta Physica Sinica,1992,41(4):649-654. |
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| Authors: | QIU XIN-LIANG LI CHENG-REN XIN MIAN-RONG and LUO CHANG-XUN |
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| Abstract: | 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. |
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