F. Tao, X. J. Zhou, J. H. Xu, G. C. Che, S. F. Zhu: The Phase Formation, Solid Solution Range and Substitution of La for Ba in La1+zBa2-zCu3Oy

Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 35 - Abstract -

F. Tao, X. J. Zhou*, J. H. Xu*, G. C. Che**, S. F. Zhu

Department of Materials, Sichuan University, Chengdu, P.R.China
*Yuzhou University, Chongqing, P.R.China
**Institute of Physics, Chinese Academy of Sciences, Beijing, P.R.China

The Phase Formation, Solid Solution Range and Substitution of La for Ba in La_1+zBa_2-zCu₃O_y

The phase formation, solid solution range and the substitution of La for Ba in La_1+zBa_2-zCu₃O_y (La123) system are investigated systematically for obtaining and understanding the optimum condition to prepare La123 superconductors with higher Tc. The solid solution ranges of La_1+zBa_2-zCu₃O_y are z=0.20-0.70 in air and z=0 in N₂. Atmosphere of air or O₂ is favourable for the substitution of La for Ba. The substitution is suppressed when La_1+zBa_2-zCu₃O_y are sintered and cooled in N₂ . It is found that sintering and cooling procedure in N₂ atmosphere is one key procedure to prepare single phase high-quality LaBa₂Cu₃O_y superconductor with higher Tc.

Keywords: phase formation, solid solution, LaBaCuO

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