Bi(Pb)-Sr-Ca-Cu-O体系中110K超导相的制备和结构研究  

PREPARATION AND STRUCTURAL STUDY OF 110 K SUPERCONDUCTING PHASE IN Bi (Pb)-Sr-Ca-Cu-O SYSTEM

作　　者：卢伟京[1] 张玉芬[2] 郑香苗[1] 韦承谦[1] 韦兆清 何俊[1] 

机构地区：[1]广西大学化学系 [2]北京大学物理化学研究所应用物化室

出　　处：《物理化学学报》1989年第2期129-134,共6页Acta Physico-Chimica Sinica

摘　　要：自K.A.Müller等人发现氧化物超导体以来,在二年的时间内,寻找更高T_c超导材料的工作在世界范围内发展很快,目前已在Bi-Sr-Ca-Cu-O和Tl-Ba-Ca-Cu-O二个体系中分别获得零电阻转变温度为110K和120K的超导体。相对而言,获得120K的Tl_2Ba_2Ca_2Cu_3O_(10)[简记为TI-2223]超导体要容易一些,我们研究室已经测定了这个超导相的结构。但是Tl_2O_3的高温易挥发性和剧毒性,给Tl系超导体的制备带来了困难。The stable superconducting phase with T_c 110 K has been prepared in samples of nominal composition (Bi_(2-x) Pb_x)Sr_2 Ca_2 Cu_3 Oy and (Bi_(2-x)Pb_x)Sr_2 Ca_3 Cu_5 O_y x=0.2,0.4,0.6. The crystal strucuure of the superconducting phase (Bi_(1·8)Pb_(0·2)Sr_2 Ca_2 Cu_3 O_y with T_c 106. 3K has been determined in the sample of nominal composition (Bi_(1·8)Pb_(0·2)Sr_2 Ca_3 Cu_5 O_y. It is a nine decker perovskite arrangement by incorporating two extra layers CaCuO_2 in each cell of Bi_2 Sr2_ Ca_1 Cu_2 O_y. The plane of CuO_2 is planar in incorporating layer CaCuO_2. Space group D_(2h)~1-Pmmm was assigned. Adding Pb is in Bi site, and atomic radius and atomic valence in Bi site was modified, so that it is able to stabilize crystal structure and progress superconducting properties.

关 键 词：超志体 制备 结构 氧化物 

分 类 号：TM262[一般工业技术—材料科学与工程]