Preparation and Characterization of the New Superconductor MgB_(2)  

作　　者：SUN Yu-Ping SONG Wen-Hai DAI Jian-Ming WU Xing-Cai WANG Kai-You ZHAO Bing XIAO Hong DU Jia-Ju WEN Hai-Hu ZHAO Zhong-Xian 孙玉平;宋文海;戴建明;吴兴才;王开友;赵兵;肖宏;杜家驹;闻海虎;赵忠贤(Laboratory of Internal Friction and Defects in Solids,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031;Laboratory of Internal Friction and Defects in Solids,National High Magnetic Field Laboratory,Hefei 230031;National Laboratory for Superconductivity,Institute of Physics and Centre for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100080)

机构地区：[1]Laboratory of Internal Friction and Defects in Solids,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031 [2]Laboratory of Internal Friction and Defects in Solids,National High Magnetic Field Laboratory,Hefei 230031 [3]National Laboratory for Superconductivity,Institute of Physics and Centre for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100080

出　　处：《Chinese Physics Letters》2001年第4期587-588,共2页中国物理快报（英文版）

基　　金：Supported by the Ministry of Science and Technology of China(NKBRSF-G1999064602);the National Natural Science Foundation of China under Grant No.59872043;the Fundamental Research Bureau,Chinese Academy of Sciences.

摘　　要：Polycrystalline samples of the new superconductor MgB_(2) are prepared by solid state reaction using Mg and B powders.The resistance measurement shows that the onset transition temperature and zero resistance transition temperature are Tonsetc=43.8 K and Tc0=37 K,respectively.The Tc0 depends on measuring current strongly.The diamagnetic transition temperature of~38 K is obtained by the ac susceptibility measurement.X-ray powder diffraction spectra of MgB_(2) can be indexed using hexagonal structure with space group P6/mmm and lattice parameters a=0.30864 and c=0.35212 nm.A second phase,probably MgO,is also found.

关 键 词：RESISTANCE TRANSITION SUPERCONDUCTOR 

分 类 号：TG1[金属学及工艺—金属学]