利用压力方法获得高2223相含量的Bi系超导材料  

PREPARATION OF BiPbSrCaCuO SUPERCONDUCTORS WITH HIGH 2223 PHASE CONTENT BY PRESSING METHOD

作　　者：吴冰青[1] 王建波[1] 柴卫平 许应凡[1] 姚玉书[1] 麦振洪[1] 

机构地区：[1]中国科学院物理研究所

出　　处：《低温物理学报》1994年第4期259-265,共7页Low Temperature Physical Letters

基　　金：国家超导技术联合研究开发中心资助

摘　　要：为制备高２２２３相含量的Ｂｉ系超导块材，提出退火处理前施以６ＧＰａ高压冷处理的工艺．利用这种方法，可使２２２３相的形成速度得到很大加快．从２２１２相出发，经分别为２０小时的退火和缓冷后，样品接近单２２２３相．考察了２２１２相样品退火各阶段的相结构，并粗略地分析了２２２３相的生成过程，初步解释了压力处理促进２２２３相生成的机理．基于以上讨论，提出一个制备较高质量Ｂｉ系超导块材的方法，其复现率很好．AbstractThe reason why the formation of single 2223 phase of Bi-system superconductor is a timeconsuming process is, due to the hindered atomic diffusion, while the sample becames severely POrous. In this paper, we have Performed a study of the effect of atomic diffusion on the formation process of 2223 phase. By means of a high pressure treatment of 6GPa before annealing, we have significantly short6ned the annealing time from> 100h to nearly 40h, with the content of 2223 phase elevated to >90%. An epitaxy growth mechanism of high Tc phases is also proposed. Thus, an approach of 'pressing→annealing→cooling ' is benefit to preparing high quality bulk BiSrCaCuO superconducting materisl.

关 键 词：超导材料 铋系 制备 高压冷处理 

分 类 号：TM26[一般工业技术—材料科学与工程]