ゾル・ゲル法による超伝導体YBa_2Cu_3O_yの生成

概要

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The preparation of superconducting YBa_2Cu_3O_y through sol-gel method was performed using an acetate aqueous solution. Conditions of gelation and conversion of gel to YBa_2Cu_3O_y ceramics were investigated, applying thermal analysis, infrared absorption spectroscopy and X- ray diffraction techniques. Transparent gel was obtained from the acetate solution with cation mole ratio of Y : Ba : Cu=1 : 2 : 3 by adjusting the initial pH of the solution. Formation of Cu metal, Cu_3O and BaCO_3 below 400℃ was found to occur during heat treatment of the gel. Above 600℃ the heated sample turned into a mixture of Y_2O_3, BaCO_3 and CuO, which finally transformed into the single phase of YBa_2Cu_3O_y at 910℃. The resultant material showed good high T_c superconductivity.
社団法人日本セラミックス協会の論文
1988-04-01