中国物理B ›› 1994, Vol. 3 ›› Issue (1): 64-70.doi: 10.1088/1004-423X/3/1/008

• • 上一篇    

PREPARATION, SUPERCONDUCTIVITY AND STRUCTURE OF THE LaBaCaCu3O7-x SUPERCONDUCTORS WITH Tc HIGHER THAN 80 K

车广灿, 杜玉扣, 贾顺莲, 杨晔, 赵忠贤   

  1. Institute of Physics, Academia Sinica, Beijing 100080, China
  • 收稿日期:1993-03-29 出版日期:1994-01-20 发布日期:1994-01-20

PREPARATION, SUPERCONDUCTIVITY AND STRUCTURE OF THE LaBaCaCu3O7-x SUPERCONDUCTORS WITH Tc HIGHER THAN 80 K

CHE GUANG-CAN (车广灿), DU YU-KOU (杜玉扣), JIA SHUN-LIAN (贾顺莲), YANG YE (杨晔), ZHAO ZHONG-XIAN (赵忠贤)   

  1. Institute of Physics, Academia Sinica, Beijing 100080, China
  • Received:1993-03-29 Online:1994-01-20 Published:1994-01-20

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摘要： In this paper, the preparation process of the tetragonal LaBaCaCu3O7-x (LBCCO) superconductor with Tc=84 K is repored. The superconductivity and structure of the LBCCO superconducting phase are investigated by means of X-ray diffraction (XRD), transmission electron microscope(TEM) and superconductivity measurements, The results indicate that the superconducting phase with Tc=82K in the LBCCO system has a tetragonal structure with a=0.3966nm, c=l.1838nm and space group P4/mmm. About 50% of the Ca and La atoms are located in 1d sites (i.e. Y site in the YBCO structure). It is confirmed that there is in fact no orthorhombic to tetragonal transition in this material. The relationship between the oxygen content and Tc is also presented.

Abstract: In this paper, the preparation process of the tetragonal LaBaCaCu3O7-x (LBCCO) superconductor with Tc=84 K is repored. The superconductivity and structure of the LBCCO superconducting phase are investigated by means of X-ray diffraction (XRD), transmission electron microscope(TEM) and superconductivity measurements, The results indicate that the superconducting phase with Tc=82K in the LBCCO system has a tetragonal structure with a=0.3966nm, c=l.1838nm and space group P4/mmm. About 50% of the Ca and La atoms are located in 1d sites (i.e. Y site in the YBCO structure). It is confirmed that there is in fact no orthorhombic to tetragonal transition in this material. The relationship between the oxygen content and Tc is also presented.

中图分类号: 

  • 74.72.Dn
61.05.cp (X-ray diffraction) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 68.37.Lp (Transmission electron microscopy (TEM)) 81.20.-n (Methods of materials synthesis and materials processing)