Abstract
Structural, electric and magnetic properties for samples in the Ba-Y-Cu oxide systems fabricated by a conventional ceramic mixing technique have been investigated. Superconductors were obtained in the compositions around Ba : Y : Cu = 2 : 1 : 3 (atomic ratio) and the sintering temperature range, 850∼1000°C The composition and temperature ranges corresponded to the formation of Ba2YCu3O7-Y compound in this system. The spuperconductors were decomposed into BaCO3, BaY2CuO5 and CuO by absorbing water. The sample, which had been aged at room temperature for several tens of days, exhibited a remarkable change in electric resistivity, while it showed only a slight change in the magnetization curve and X-ray diffraction pattern. This change is thought possibly due to the absorption of water into the grain boundaries. Similarly, the change was also observed in the specimen aged at 200°C
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