金属有機酸塩を出発物質とするゾルーゲル法によるYBa_2Cu_3O_<7-X>超伝導体の合成(<小特集>セラミック材料)

概要

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Suppression of the bloating of the Y-Ba-Cu-O metal acetate gels duri1g heating for the conversion of gel-to-Supercomducting oxide was attempted by three different approaches:the use of metal formates characterized with less numbers of carbon and hydrogen atoms in a molecule than correspoding metal acetates, the vacuum drying of the gel fiber before heating, and the reduction of the rate of heating of the acetate gel. Vigorous bloating was seen in metal formate gels as well in the temperature range where the copper formate complexes were decomposed, and thus the use of metal formates as the starting materials was not effective in suppressing the bloating. The vacuum drying of the gel was not effective either. On the other hand, the reduction in the rate of beating for gel-to suprconductor conversion was effective in suppressing Vigorous bloating, leading to the formation of solid ceramic supercotlducting fibers with T_c (end) of 86.3K.
社団法人日本材料学会の論文
1991-04-15