有機塩塗布熱分解法によるY_1Ba_2Cu_4O_8膜の作製ならびにY_1Ba_2Cu_3O_<7-x>膜の高J_c化

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In this study, c-axis oriented Y_1Ba_2Cu_4O_8(124) films and high critical current dendity (J_c) Y_1Ba_2Cu_3O_<7-x> films were obtained by the Metalorganic Deposition (MOD) method and the MOD method with application of the decomposition process (124→123+CuO) respectively. C-axis oriented 124 phase films could not be fabricated from direct heat-treatment in the stable temperature region of 124. In order to obtain c-axis oriented 124 phase films, c-axis oriented 123 phase films were synthesized prior to reaction with CuO. In this process, however, single-phase films of 124 were hardly synthesized even changing the heat-treatment conditions or the ratio of CuO. First the 124 phases were synthesized, and then the high-J_c. 123 phase films were synthesized by transforming the 124 phases into the 123 phases. The reason why the high-J_c. 123 phase films were obtained is probably due to the existence of impurity phase in the 123 phase as pinning centers and/or refinement of the 123 grain boundaries.
社団法人日本セラミックス協会の論文
1993-06-01