Abstract
The morphological and compositional changes of the Pt-based phase in melt-grown Y-Ba-Cu-O samples grown on the Al2O3 substrate were studied. It was shown that Al dissoluted in the melt is effectively consumed by the Pt-based phase, by replacing Cu with Al until it becomes fully converted to the Pt, Al-based phase. Al substitution changes irregular shape of Pt-based particles into Pt, Al-based crystals with well-developed habits. Ag addition hinders Al diffusion into the Y-Ba-Cu-O sample during melt processing.
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