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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,从而限制了达个体 相似文献
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The stable superconducting phase with T_c 110 K has been prepared in samples of nominal composition (Bi_(2-x)Pb_x)Sr_2Ca_2Cu_3O_y and (Bi_(2-x)Pb_x)Sr_2Ca_3Cu_5O_y x=0.2, 0.4, 0.6. The crystal strucuure of the superconducting phase (Bi_1.8Pb_0.2)Sr_2Ca_2Cu_3O_y with T_c 106.3 K has been determined in the sample of nominal composition (Bi_1.8Pb_0.2)Sr_2Ca_3Cu_5O_y. It is a nine decker perovskite arrangement by incorporating two extra layers CaCuO_2 in each cell of Bi_2Ca_1Cu_2O_y. The plane of CuO_2 is planar in incorporating layer CaCuO_2. Speace group D~1_(2h)-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. 相似文献
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