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1. 发明授权

US4996186A Flux method for producing crystals of superconducting YBa.sub.2 Cu.sub.3 O.sub.7 失效
标题翻译：用于生产超导YBa2Cu3O7晶体的通量法
公开(公告)号：US4996186A
公开(公告)日：1991-02-26
申请号：US228979
申请日：1988-08-05
申请人： Zhao Z. Wang , Nai-Phuan Ong
发明人： Zhao Z. Wang , Nai-Phuan Ong
IPC分类号： C30B9/00
CPC分类号： C30B29/225 , C30B9/00 , Y10S420/901 , Y10S505/729
摘要： Method for producing single crystals of YBa.sub.2 Cu.sub.3 O.sub.7 which undergo a transition to the superconducting state above 90K, comprising:(a) preparing a flux composition by mixing BaO.sub.2 and CuO powders in the molecular weight ratio of approximately 1:1, layering on top of the mixture powdered YBa.sub.2 Cu.sub.3 O.sub.7 in an amount up to approximately 20% of the total weight of the BaO.sub.2 --CuO mixture, firing the mixture in air at approximately 930.degree. C.-950.degree. C. for approximately 24 hours, and thereafter raising the temperature from 930.degree. C.-950.degree. C. to approximately 1025.degree.-1030.degree. C. within 1/2 hour and maintaining the temperature at approximately 1025.degree. C.-1030.degree. C. for approximately one hour to one and one-half hours;(b) cooling thereafter the flux to approximately 1020.degree. C.-980.degree.;(c) providing an oxygen gas flow to the flux when the temperature is approximately 1020.degree. C.-980.degree. C.;(d) maintaining the flux in an oxygen gas flow at approximately 980.degree. C. for approximately 30 minutes or longer;(e) cooling thereafter the flux in oxygen gas flow from approximately 980.degree. C. to 960.degree. C. at a rate of no more than 2.degree. to 20.degree. C./hour; and(f) cooling thereafter the flux slowly to room temperature in an oxygen gas flow.
摘要翻译：生产YBa2Cu3O7单晶的方法，该YBa2Cu3O7过渡到超过90K的超导状态，包括：（a）通过将BaO 2和CuO粉末以大约1:1的分子量比混合来制备助熔剂组合物，分层在混合物的顶部粉末YBa2Cu3O7的量高达BaO 2-CuO混合物总重量的约20％，在空气中将混合物在约930℃-95℃下焙烧约24小时，然后升温至930℃ 在1/2小时内，在-95℃至约1025℃-1030℃，并将温度保持在约1025℃-1030℃约1小时至1.5小时; （b）然后将助熔剂冷却至约1020℃-980℃; （c）当温度约为1020℃-980℃时，向焊剂提供氧气流。（d）将氧气流中的助熔剂维持在约980℃约30分钟或更长时间; （e）此后，其中氧气中的助熔剂以不超过2℃至20℃/小时的速率从约980℃流动至960℃; 和（f）之后将助熔剂在氧气流中缓慢地冷却至室温。

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