Abstract
Liquid phase epitaxial (LPE) Y 1− x Ca x Ba 2Cu 3O 7− δ (Ca–YBCO) was successfully grown in the fabrication of thick films with high T c values (over 90 K) even with a small thickness of 0.5 μm. ICP analyses reveal the Ca distribution coefficient (solid composition/liquid composition) is higher than unity, which may imply a Ca-poor grain boundary in Ca-doped LPE thick films. TEM-EDX analyses reveal Mg is non-detectable in a Ca-doped sample, while it is detected to be higher than 1 at.% in a non-doped YBCO thick film, suggesting that the interaction parameter between Ca and Mg ( e Ca Mg) is positively high and leads to suppressing the Mg contamination. J c decreases less in the Ca-doped film than in the non-doped film with increase of the applied magnetic field.
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