ANOMALOUS MAGNETIZATION AND OXYGEN DIFFUSION IN THE MELT-TEXTURED Y-BA-CU-O DOMAIN WITH WITHOUT BACEO3 ADDITION

Magnetic hysteresis characteristics and the microstructure related to oxygen diffusion were investigated for the melt-textured Y-Ba-Cu-0 domain with/without BaCeO3 addition. For appropriate oxygenation time, an anomaly, which seems to be due to the flux pinning by oxygen deficiency, is observed at an intermediate magnetic field of the magnetization curves. The magnitude of the anomaly was remarkably reduced with increasing oxygenation time in the BaCeO3 added domain but still remained in the undoped 1-2-3 domain in spite of a prolonged oxygenation time. A microstructural investigation showed that the domain with fine BaCeO3 dispersion was more easily transformed into the orthorhombic phase than the undoped 1-2-3 domain. We discussed the variation of the magnetization characteristics in relation with the microstructure concerning oxygen diffusion.