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Doping of non-interacting nanoparticles in YBCO superconductors in order to get fine microstructure defects has been studied. Y-211 inclusion, itself has large potential to create structural defects without affecting Y-123 matrix phase. Nanoparticles of grain refining agent like CeO 2 /Pt/PtO 2  are interesting dopants, especially CeO 2  for being cheaper than Pt. POIG process, as is one of the advance processing techniques to get uniform distribution of fine Y-211 particles of the order of 1-2 μm, throughout the YBCO composites. Finer Y-211 particles can drastically increase the pinning centers. Introduction of fine sized CeO 2  as grain refining agent to reduce the size of Y-211 particles would create additional pinning centers. In the present work, the effect of CeO 2  on Y-211size and distribution in POIG processed YBCO composite was studied. It was observed that with increase in CeO 2  content Y-211 particle size decreases below 1μm and even less than 0.5μm for 10 weight percent CeO 2  doping. The mechanism for refinement appears to be the formation of BaCeO 3  on the surface of Y-211 during liquid phase infiltration that leads to splitting of Y-211 into smaller particles.

THE EFFECT OF CeO2 NANOPARTICLE DOPING ON REFINEMENT OF Y-211 PARTICLES IN POIG PROCESSED YBCO COMPOSITES

THE EFFECT OF CeO₂ NANOPARTICLE DOPING ON REFINEMENT OF Y-211 PARTICLES IN POIG PROCESSED YBCO COMPOSITES