Abstract
Bulk YBaCuO samples doped with excess Y or other additives (including rare earths and Nb) and prepared by means of the melt quench process exhibit high magnetization and diamagnetic susceptibility. These can be attributed to the formation of a microstructure which is highly aligned and has few cracks and voids. These characteristics are associated with the presence of a second phase. The importance of this study lies in its applicability to the preparation of polycrystalline superconducting oxides with very high J c values through careful control of their microstructure, in particular through the use of non-stoichiometric formulations and the introduction of additives in conjunction with melt-based processing methods.
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