Effect of additives on the morphology and superconductivity of YBa2Cu3O6+x ceramic materials
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The effect of the addition of 0–15 wt.% alumina powder on the grain size, morphology and superconducting properties of sintered YBa2Cu3O6+x was investigated as a function of alumina concentration in the composites. The results suggest that the grain size of YBa2Cu3O6+x decreases with an increase in the additive concentration. Some surface erosion of the YBa2Cu3O6+x grains was also noticeable in Al2O3/YBa2Cu3O6+x composites. The results also indicate that the additive tends to stabilize the nonsuperconducting tetragonal phase of the YBa2Cu3O6+x at the expense of the superconducting orthorhombic crystal phase.
KeywordsAdditive grain size morphology superconductivity
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