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Domain structure and Y2BaCuO5distribution in single- and multiple-domain melt-textured YBaCuO

Microstructural features such as subgrains, Y{sub 2}BaCuO{sub 5} particles, and high-angle boundaries were studied in single- and multiple-domain melt-textured Y{sub 2}BaCuO{sub 5} levitators. Subgrains elongated in the c- or a-direction and rectangular in cross section were formed during solidification by cellular growth. Formation of subgrains by combination of a- and c-growth was also observed. Their boundaries were predominantly low angle, and were not cracked or wetted by second phases. Macrosegregation of Y{sub 2}BaCuO{sub 5} particles developed mainly in the regions formed by c-axis growth. The segregation is related to a Y{sub 2}BaCuO{sub 5} particle pushing by the YBa{sub 2}Cu{sub 3}O{sub 7 - x} growth front, in combination with coarsening by Ostwald ripening and agglomeration. The structure of 90 degree high-angle grain boundaries appeared to be similar to that of the low-angle grain boundaries.