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中文摘要：
采用定向凝固技术可获得高临界电流密度的YBCO样品。本文研究了YBCO试样在定向凝固过程的融化生长阶段所出现的停止生长现象，并分析了YBCO块材生长前沿的形态和化学成分。结果表明：当生长前沿液相中Y和Ba消耗殆尽而富Cu时，YBCO晶体的生长就会停止；为连续生长具有一定取向的YBCO样品或大块YBCO超导体，需要将融化生长过程中生长前沿的液相成分调整为富Y和Ba的成分。
英文摘要：
An YBCO sample with high critical current density or single crystal stracture, can be obtained by the directional solidification method. In the present paper the morphology and chemical composition at the growth front of YB CO crystal have been investigate in order to it make clear the stopped growth mechanism of YBCO crystal growth during melt growth moment of the directional solidification. It is found that YBCO crystal will cease growing when yttrium and barium are depleted and copper becomes rich element in the liquid phase at the YBCO crystal growth front. For maintaining the continuous growth of YBCO, the composition of Y, Ba and Cu in raw sample has to be adjusted so as to make yttrium and barium enrichments in the liquid phase at the YBCO crystal growth front during the melt growth process.
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