Abstract
YBCO (YBa2Cu3O7/ Y2BaCuO5) bulk single-grain superconductors were prepared by Top-Seeded Melt-Growth (TSMG) process. CeO2, BaCeO3 and BaO2 powders were added to nominal composition Y1.5Ba2Cu3Oy (Y-123) with the aim to refine Y2BaCuO5 (Y-211) secondary particles, which provide pining. Added powders were refined by friction milling. The system behaviour was characterized by thermal analyses. Microstructure of prepared samples was studied by polarized light microscopy and the influence of additions is described.
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