高铅掺氟Bi系超导体的研制

来源期刊：中南大学学报(自然科学版)1993年第6期

论文作者：李洁 高孝恢 高赛

文章页码：837 - 842

关键词：化学动力学; 活化能垒; 掺氟Bi系超导体

Key words：F-doped Bi (Pb)-system superconductors; chemical kinetics; potential barrier

摘    要：本文首次报道了五种高铅量Bi系超导体Bi_2-nPb_nSr₂Ca₂Cu₃O_y-xF_x(n=1.0,1.2,1.4,1.6,1.7)的制备,x在1.0～1.4的范围内,n依次取上述值时。超导体的T_co分别为113.6K,112K,104K,88K,78K。X射线粉末衍射,红外光谱等分析表明,n=1.0～1.4时超导体仍具有2223相结构特征;n=1.6,1.7时表现出新的结构特点,此外从化学动力学观点初步探讨了CuF₂,PbO在超导相形成过程中的作用。

Abstract: Five kinds of superconductors were directly synthesized with CuF₂ substituting parts ofCuO. According to the nominal composition Bi_2-nPb_nSr₂Ca₂Cu₃O_y-xF_y, as n was equal to1.0, 1.2, 1.4, 1.6, 1.7, and x ranged from 1.0 to 1.4, T_co of samples were 113.6 K, 112K, 104 K, 88 K, and 78 K respectively. The result of X-ray powder diffraction, infraredspectra showed that superconductors with Pb amount equal to 1.0, 1.2, 1.4 still kept 2223superconductive structure and they exhibited new structural features as Pb amount equaled1.6, 1.7. The effect of CuF₂ and PbO on the formation of super conducting phase were stud-ied based on chemical kinetics.