New Reaction Routes for Preparing Single-Phase Tl_2CaBa_2Cu_2O_8 and Tl_2Ca_2Ba_2Cu_3O_<10> Powders from Stoichiometric Mixtures

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概要

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• Single-phase Tl_2CaBa_2Cu_2O_8 and T1_2Ca_2Ba_2Cu_3O<10> powders were prepared from stoichiometric mixtures by the following two reactions: (l) CaBa_2CuO_4 + T1_2O_3 + CuO→Tl_2CaBa_2Cu_2O_8 and (2) T1_2CaBa_2Cu_2O_8 + CaO + CuO→T1_2Ca_2Ba_2Cu_3O_<10>. Single-phase powders were obtained at 830℃ for the first reaction, and at 870℃ for the second reaction. At these temperatures, the extent of powder melting and the rate of Tl loss were small. Powders thus prepared showed superconducting temperatures (both the zero-resistivity and diamagnetic onset temperatures) of above 110 K and a saturation Meissner effect of 20% of (-1/4π) at a field of 20 G.

• 社団法人応用物理学会の論文
• 1989-08-20

著者

• Lee Sern-nan

  Department Of Chemical Engineering National Taiwan University

• Yao Yeong

  Institute Of Physics Academia Sinica

• Wu Nae-lih

  Department Of Chemical Engineering National Taiwan University

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• New Reaction Routes for Preparing Single-Phase Tl_2CaBa_2Cu_2O_8 and Tl_2Ca_2Ba_2Cu_3O_ Powders from Stoichiometric Mixtures

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