Bi-Sr-Ca-Cu-O系超导体制备过程中化学组成的选择性挥发  

Preferential Volatilization of the Chemical Components in Bi-Sr-Ca-Cu-O Superconductor during the Process of Preparation

作　　者：赵良仲[1] 胡玉秀[1] 王俊茹 杨德亮[1] 张金彪[1] 朱道本[1] 

机构地区：[1]中国科学院化学研究所

出　　处：《无机材料学报》1990年第4期346-348,共3页Journal of Inorganic Materials

摘　　要：实验表明,在烧制 Bi-Sr-Ca-Cu-O 超导体时,压片两面用银片覆盖后热处理有利于110K 超导相生成,制得的超导体有较高的零电阻温度。XPS 分析表明,在烧制超导材料时 Bi 能优先挥发,其次是 Ca。有银片覆盖可减轻 Bi 等成份的挥发程度,因此有银片覆盖的超导体中 Bi、Sr、Ca 和 O 的相对浓度比无银片覆盖的超导体中的要高。A comparative study shows that during heat treatment,Ag-sheet covered Bi-Sr-Ca-Cu-O superconductor has a higher zero resistance T_(?) than the uncovered one,and 110K superconducting phase is easily formed in the Ag-covered sample than inthe uncovered one.XPS results show that the preferential volatilizing of Bi and Caespecially Bi in Bi-Sr-Ca-Cu-O superconductor occurs during sintering process.Therelative concentrations of Bi,Sr,Ca and O in the sample covered with Ag-sheetare higher than that of the uncovered one because the Ag cover can depress thevolatility.

关 键 词：超导体 制备 化学组成 铋 锶 钙 

分 类 号：TM262[一般工业技术—材料科学与工程]