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.
Received: 29 March 1993
Accepted manuscript online:
(Methods of materials synthesis and materials processing)
Cite this article:
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) PREPARATION, SUPERCONDUCTIVITY AND STRUCTURE OF THE LaBaCaCu3O7-x SUPERCONDUCTORS WITH Tc HIGHER THAN 80 K 1994 Acta Physica Sinica (Overseas Edition) 3 64
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