ゾル-ゲル法によるBa_2YCu_3O_<7-y>超電導体コンポジットの作製

概要

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The synthetic process for the composite polycrystalline Ba_2YCu_3O_<7-y> (abbreviated to BYCO) superconductor by the sol-gel method was discussed. The solution containing Ba^<2+>-, Y^<3+>-, Cu^<2+>-and Si-alkoxide was changed to gel by very slow drying. The dried gels were converted to superconductor by heat treatment under low pressure of air and subsequent oxidizing in O_2 atmosphere. The sintered BYCO body had a nano-composite structure consisting of BYCO and Ba_2SiO_4 and other phases. This sintered body showed an enhanced magnetic property in the superconducting state because of introduction of pinning centers. On the other hand, composition control to avoid the segregation of a secondary phase at grain boundaries was effective in increasing the conductivity of superconducting transport current.
社団法人日本セラミックス協会の論文
1992-04-01