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Y-Ba-Cu-O (YBCO) and Sm-Ba-Cu-O (SmBCO) thin films have been used for thefirst time as heterogeneous seeds to multi-seed successfully the melt growth ofbulk YBCO in a multi-seeded melt growth (MSMG) process. The use of thin filmseeds, which may be prepared with highly controlled orientation (i.e. with awell-defined a-b plane and precisely known a-direction), is based on theirsuperheating properties and reduces significantly contamination of the bulksample by the seed material. A variety of grain boundaries were obtained byvarying the angle between the seeds. Microstructural studies indicate that theextent of residual melt deposited at the grain boundary decreases withincreasing grain boundary contact angle. It is established that the growthfront proceeds continuously at the (110)/(110) grain boundary without trappingliquid, which leads to the formation of a clean grain boundary.

Multi-seeded melt growth (MSMG) of bulk Y-Ba-Cu-O using thin-film seeds