Ba-Y-Cu-O系超伝導酸化物用基板材料としてのケイ酸カルシウム

概要

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The reactivities of Ba_2YCu_3O_<7-x> with BaZrO_3 and CaSiO_3 were studied to develop a substrate material for superconducting oxide films. It was found that BaZrO_3 and CaSiO_3 were less reactive to Ba_2YCu_3O_<7-x> and the onset critical temperature of Ba_2YCu_3O_<7-x> remained unaltered after heating in contact with these materials at 1223 K. Although BaZrO_3 was less reactive than CaSiO_3, BaZrO_3 was unsuitable for the substrate of Ba_2YCu_3O_<7-x> films because of the large difference of the thermal expansion coefficient. On the other hand, the thermal expansion coefficient of CaSiO_3 is almost the same as that of Ba_2YCu_3O_<7-x>. High-T_c superconducting oxide films were prepared easily on the CaSiO_3 substrate by the conventional dipping-pyrolysis method. As a result, mixed oxide, CaSiO_3, is one of the promising materials for the substrate of Ba_2YCu_3O_<7-x> films because of its low cost, low reactivity, and comparable in thermal expansion coefficient.
社団法人日本セラミックス協会の論文
1992-03-01