YBa_2Cu_3O_<6.9>の電気的性質に及ぼす酸素処理の効果

概要

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The superconducting compound, Y-Ba-Cu-O, was prepared and treated ( transfer of the sample from the furnace, mounting in the equipment and measurements, etc. ) in the pure oxygen atmosphere in order to prevent absorption of moisture and carbon dioxide, as well as to hinder oxygen removal from the oxide. The electrical resistivities were measured under the initial oxygen pressure of 2.02X10^6Pa. The oxygen pressing and heating treatment at 2.02X10^6Pa for 24 h at 363 K was conducted for several times, and the effects of the treatment on the superconducting transition temperature (T_c) and on the resistivities were investigated. By the oxygen pressing and heating treatment for the Y-Ba-Cu-O system, the on set and off set T_c decreased, and the resistivities increased. On the other hand, the oxygen pressing treatment at the room temperature gave a constant T_c, while the resistivities increased. The dry air pressing and heating treatment decreased the off set T_c, and enhanced the resistivities greatly. By the dry air pressing treatment at room temperature, on the contrary, the same T_c was kept and the resistivities was slightly increased .
社団法人日本セラミックス協会の論文
1988-04-01