Dissolution of Y2BaCuO5 through the peritectic reaction rim formed at the front of growing YBa2Cu3O7-y crystal

Microstructure related to the peritectic reaction was investigated in melt-textured Y-Ba-Cu-O. It was found that Y2BaCuO5 particles dissolved in the peritectic reaction rim formed at the interface between YBa2Cu3O7-y crystal and Ba-Cu-O liquid phase. Y2BaCuO5 morphology was a block shape in the liquid while it was changed to a round shape in the textured YBa2Cu3O7-y crystal through an irregular shape due to inhomogeneous dissolution of Y2BaCuO5 particles. By way of dissolution, one Y2BaCuO5 particle was divided into several particles. The refinement process of Y2BaCuO5 is discussed in terms of the dissolution process of Y2BaCuO5 and its morphology. 15 refs.