Reaction Mechanism of Forming the High-Tc Superconductor in the Pb-Bi-Sr-Ca-Cu-O System
Reaction Mechanism of Forming the High-Tc Superconductor in the Pb-Bi-Sr-Ca-Cu-O System
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Pb-Bi-Sr-Ca-Cu-O体系中形成高温超导体的反应机理
DOI：
10.1143/jjap.27.l1852
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发表时间：
1988
影响因子：
1.5
通讯作者：
Y. Oguri
中科院分区：
文献类型：
--
作者：
N. Kijima;H. Endo;J. Tsuchiya;A. Sumiyama;M. Mizuno;Y. Oguri
研究了Pb-Bi-Sr-Ca-Cu-O系合成物相与起始组成的关系。推测形成高Tc相（Tc = 110 K）的反应步骤如下。首先，通过低T_c相的分解反应得到高T_c相和Bi_2Sr_2Cu_x相。Bi 2Sr 2CuOx和残留的Ca和Cu原子熔化到PbO焊剂中。低Tc相从熔体中沉淀出来。所形成的低Tc相引起进一步的结晶反应。高Tc相通过重复该循环而大量产生。
A relationship between synthesized phases and starting compositions has been studied in the Pb-Bi-Sr-Ca-Cu-O system. The reaction step of forming the high-Tc phase (Tc∼110 K) has been presumed as follows. Firstly, the high-Tc phase and Bi2Sr2CuOx are obtained from the disproportionation reaction of the low-Tc phase. Bi2Sr2CuOx and residual Ca and Cu atoms melt into the PbO flux. The low-Tc phase is precipitated from the melt. The formed low-Tc phase causes a further disproportionation reaction. The high-Tc phase is produced in large quantities by repeating the cycle.