Film thermal stability correlation with seeding modes in the growth of YBa₂Cu₃O_7−δ crystals

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• 作者：Hui Xiang ; Wei Wang ; Hao-Chen Li ; Xiang-Xiang Cui ; Wen-Shuo Fan ; Lin-Shan Guo ; Xin Yao ; Zhi-Qiang Zou and Jie Xiong
• 关键词：film thermal stability ; supersaturation ; buried seeding ; melt growth ; wetting ability
• 刊名：Journal of Applied Crystallography
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：49
• 期：3
• 页码：873-879
• 全文大小：1129K
• ISSN：1600-5767

文摘

High-quality and large YBa₂Cu₃O_7−δ (YBCO or Y123) single crystals are necessary for both fundamental studies and practical applications. The recently exploited modified melt growth (MMG) procedure realizes a high efficiency of growth and high purity of Y123. However, it was unexpectedly found that the thermal stability of the NdBa₂Cu₃O_7−δ (Nd123) film seed applied in MMG is greatly reduced owing to a change in the liquid property. In order to solve this problem, a new top-seeding mode, buried seeding, is developed to strengthen the film thermal stability, leading to a remarkable enhancement of endurable maximum processing temperature of over 30 K in low supersaturation. Furthermore, the correlation of the thermal stability of the film seed in melt growth with the liquid property and top-seeding modes is clarified. Most importantly, the buried-seeding mode was successfully applied in this work, opening a promising pathway for the effective growth of single crystals of other REBCO (RE = Nd, Sm, Gd) oxides (possessing a higher peritectic temperature than YBCO), as well as other functional oxides.