Abstract
Superconductive BYCO ceramics with the transition temperature of 95K have been obtained by sintering in oxygen gas flow at 950°C, and the relationships between the superconductive properties and the texture have been studied. With increasing the apparent density of the BYCO ceramics, Tc decreased. The crystallite boundary and lattice defect, studied with a transmission electron microscope, also degraded the transition temperature. By adding CuO to the calcined BYCO powder, well aligned flaky particles in which the a-b planes preferentially grow were formed, and much sharp transition, as well as some increase in critical current, has been recognized in comparison with normal BYCO ceramics.
