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Suppression of the surface nucleation of YBa$_2$Cu$_3$O$_7-y$ by CeO$_2$ coating of the top-seeded melt processed YBCO superconductors  

Kim, Ho-Jin (Korea Atomic Energy Research Institute)
Jun, Byung-Hyuk (Korea Atomic Energy Research Institute)
Kim, Chan-Joong (Korea Atomic Energy Research Institute)
Publication Information
Progress in Superconductivity and Cryogenics / v.5, no.3, 2003 , pp. 1-5 More about this Journal
Abstract
The effect of CeO$_2$ coating on the surface nucleation of the top-seeded melt-growth processed YBCO superconductors was studied. It was effective that the coating of Y123 compact surfaces by CeO$_2$ powder suppressed the undesirable subsidiary YBa$_2$Cu$_3$O$_{7-y}$ (Y123) nucleation during melt processing. BaCeO$_3$ was formed in the CeO$_2$-coated layers, which might cause a CuO-excessive liquid at the partial melt stage of $Y_2$BaCuO$_{5}$(Y211) plus liquid, and thus the Y123 nucleation at the YBCO compact surfaces could be suppressed during the melt growth of Y123 grain. In addition, the CeO$_2$ refined the Y211 particles near the compact / coating interface. While the levitation forces of the top surfaces with and without CeO$_2$ coating were similar to each other, the levitation force of the interior of the CeO$_2$ coated sample was higher than that of the interior of the sample without CeO$_2$ coating, which was attributed to the suppression of subsidiary Y123 nucleation at the compact walls.s.s.
Keywords
CeO$_2$ coating; surface nucleation; top-seeded melt growth process; Y-Ba-Cu-O superconductor;
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