Bi-Pb-Sr-Ca-Cu-O系高温相の濡れ性について

概要

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Highly-oriented sintered pellets of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system with high density have been prepared by the liquid-phase sintering method. A liquid phase was made from the mixture of the Sr-rich component of the 2201 solid solution, Bi2+xSr2-xCu1+yOz (0.125<x≤0.5, O<y<x/2), and Ca2PbO4. Samples with various compositions, (1-x) 2223 phase +x liquid phase with 0<x ?? 0.20, were heated in the temperature range from 820°C to 830°C for 16h. The maximum critical current density (J) of 700 A/cm2 at zero field and 77K was obtained for the sample with x=0.15, heat-treat at 825°C. It was found from X-ray diffraction measurement that Ca2CuO3 always exists in the sample showing a low Jc. On the other hand, a large Jc was attained for the sample where particles were densely packed to be tightly connected to each other as a result of the liquid-phase sintering.
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