短時間焼成によるBi系2223相の合成

概要

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The high Tc 2223 Phase in the Bi Pb Sr Ca Cu O sys tem has been synthesized by solid state reaction. The processing parameters which give the largest volume fraction of the 2223 phase were found as follows. A mixture of Bi_2O_3, PbO, SrC0_3, CaCO_3 and CuO was pressed into a bar shape and calcined at 1133 K for 5h, then cooled to 873 K with a cooling rate of 0.5 K/min. After being pulverized and pressed, the specimen was fired again at 1133 K for 5h and cooled to 873 K with a cooling rate of 0.5 K/min. With these simple synthesizing procedures, a superconducting sample which has a high T_e 2223 Phase volume fraction as high as 91%, was successfully obtained. Our synthesizing method results in a much greater volume fraction of the 2223 phase than do conventional methods. The zero resistance temperature of our sample was 102 K.
社団法人日本セラミックス協会の論文
1994-06-01