Bi-Sr-Ca-Cu-O 体系中的C相  

THE C PHASE IN Bi-Sr-Ca-Cu-O SYSTEM

作　　者：吴乾章[1] 容锡燊 付正民 李妍艳[1] 唐棣生[1] 黄家山[2] 陈克樵[2] 徐孝贞 程先安[4] 

机构地区：[1]中国科学院物理研究所 [2]矿产地质部矿床地质研究所 [3]中央民族学院物理系 [4]北京航空航天大学应用数理系

出　　处：《低温与超导》1989年第2期42-47,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金

摘　　要：本文按分子式 Bi_2Sr_2CaCu_2O_x 配料,将它的熔体在空气中快速冷却,得到许多晶粒,其中除了大量 c=30.8(?)的 A 相外,尚有 c=24.5(?)的 c 相.我们还进一步进行了试验,得到了较纯的大片 C 相。C 相属于简单四方点阵,室温时点阵常数为 a=b=3.8054(?),c=24.531(?),经低温测定,C 相的超导起始转变温度 Tc=21.4K,零电阻温度约为4K。When a melt of composition Bi2Sr2CaCu2Ox was cooled rapidly in air, many small crystals were obtained. Most of the crystals are of A phase whose c = 30.8A and some C phase of c = 24.5A. Further exper iments have been done to obtain purer and larger C phase. C phase belongs to simple tetragonal lattice and its lattice parameters at room temperature are. a = b = 3.8054A and c = 24.531A. By means of low temperature resistance determintion, its superconductive transition on set temperature is 21.4K and the ze'ro resistance Tc nearly 4K.

关 键 词：高温 超导体 Bi体系 C相 

分 类 号：TM262[一般工业技术—材料科学与工程]