Abstract
Abstract It is well known that the critical current density ( J c ) of Y123 bulk superconductor can be increased by the introduction of non superconducting flux pinning centers such as small secondary phases precipitates (1 μm 3 ). Thus, several studies have shown that the introduction of CeO 2 and SnO 2 powders allows the formation of micron size secondary phases homogeneously distributed in the Y123 matrix allowing an increasing of J c . As the precipitates size should be a crucial parameter that affects pinning properties of Y123, this work is devoted to compare, in terms of microstructure and superconducting properties, the effect of micrometric and nanometric SnO 2 particles addition in the ‘SnO 2 +CeO 2 ’ doped sample. It was shown that the addition of nanometric SnO 2 particles, compared with an addition of micronic SnO 2 particles, induces an increasing of the reactivity between the liquid phase and the dopants. Then, Y211 coarsening is not reduced and micronic secondary phases is formed conducting to obtain no improvement of the superconducting properties.
Published Version
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