Preparation of the High-Tc Phase of Bi-Sr-Ca-Cu-O Superconductor
Preparation of the High-Tc Phase of Bi-Sr-Ca-Cu-O Superconductor
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Bi-Sr-Ca-Cu-O超导体高温相的制备
DOI：
10.1143/jjap.27.l1476
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发表时间：
1988
影响因子：
1.5
通讯作者：
T. Kawai
中科院分区：
文献类型：
--
作者：
U. Endo;S. Koyama;T. Kawai
Bi、Pb、Sr、Ca和Cu的混合硝酸盐在830°C左右在低氧压下共分解，形成了高Tc超导相Bi（Pb）-Sr-Ca-Cu-O，其Tc（0）为107.5K。在低氧压下通过常规固态反应方法制备的样品也显示在107.5K处的超导转变。X射线粉末衍射和磁化率测量这些样品上显示的高Tc相没有80 K或半导体相。在低氧压下的反应具有宽范围的降低温度的效果，以提供Bi-Sr-Ca-Cu-O的高Tc相。
Co-decomposition of mixed nitrates of Bi, Pb, Sr, Ca and Cu around 830°C under low oxygen pressure led to the formation of a high-Tc superconducting phase of Bi(Pb)-Sr-Ca-Cu-O with Tc(zero) at 107.5 K. A sample prepared by a conventional solid state reaction method under low oxygen pressure also showed the superconducting transition at 107.5 K. X-ray powder diffraction and magnetic susceptibility measurements on these samples revealed the high-Tc phase without 80 K or semiconducting phase. The reaction under low oxygen pressure has an effect to lower the temperature with broad ranges to render the high-Tc phase of the Bi-Sr-Ca-Cu-O.