MICROSTRUCTURE CONTROL OF OXIDE SUPERCONDUCTOR BY THE CHEMICAL-REACTION AND THE GRAIN-GROWTH TECHNIQUE

Nano-composite of Ba2YCu3O7-y-Ag superconductor was synthesized by the hot isostatic pressing (HIP) of the hyblid powder derived from chemic al and mechanical process. Magnetic flux pinning property was enhanced by the microstructure control. Post heattreatment of the HIPed body a t optimum temperature range, under the temperature gradient condition and the joining to the single crystal promoted the unidirectional grai n growth which eliminated the weak link.