Abstract
The effects of oxygen partial pressure on the Y123 crystal growth were studied. Under 1 atm oxygen pressure YBCO(Y123) single crystals were fabricated by using the crystal pulling method. Compared with single crystals grown under air atmosphere, this high oxygen partial pressure played a significant role in increasing growth rate, which is 1.5–2.5 times higher than that in air atmosphere. Twin structures were observed on as-grown crystal surface. However, they did not appear when crystals were cooled in pure nitrogen. A large crystal -- size up to 19.8×19.5 mm2 in the a-b plane and 16.5 mm in the c-axis direction -- was successfully obtained by using a crucible of 50 mm in diameter.
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