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1. 发明授权

US5998338A Method for preparing oxide superconductors 失效
标题翻译：制备氧化物超导体的方法
公开(公告)号：US5998338A
公开(公告)日：1999-12-07
申请号：US47127
申请日：1998-03-24
申请人： Yasuo Watanabe , Akihiko Endo , Takateru Umeda , Yuh Shiohara , Shoji Tanaka
发明人： Yasuo Watanabe , Akihiko Endo , Takateru Umeda , Yuh Shiohara , Shoji Tanaka
IPC分类号： C01G1/00 , C01G3/00 , C30B29/22 , H01L39/12 , H01L39/24 , C04B35/653
CPC分类号： H01L39/126 , H01L39/2419 , H01L39/2483
摘要： There is provided a method for stably preparing rare earth (RE) 123 type oxide superconductors exhibiting outstanding superconductive properties in the atmosphere. In the method for preparing RE 123-type oxide superconductors by melting, cooling and solidifying a starting composition containing one or more than two kinds of RE such as Y, Sm, Nd, etc., and Ba, Cu and O as constituent elements to crystallize the RE 123-type oxide superconductors, the quantity of replacement between RE and Ba in "RE 123 crystals to be formed" is controlled by changing the initial constitution of the starting composition, for example, by changing the initial constitution to a more Ba-rich side than a composition on a 123-211 (or 422) tie line on a phase diagram to yield RE 123-type oxide superconductors in the atmosphere, which exhibits a critical temperature of 90 K or above and higher critical current density (Jc) in a magnetic field. A trace amount of Pt or CeO.sub.3 may be added to micronize the 211 (or 422) phase so as to further improve Jc.
摘要翻译：提供了一种稳定地制备在大气中表现出优异的超导性能的稀土（RE）123型氧化物超导体的方法。在通过熔融，冷却和固化含有一种或多于两种的诸如Y，Sm，Nd等的RE的起始组合物和作为组成元素的Ba，Cu和O的制备RE 123型氧化物超导体的方法中，使RE 123型氧化物超导体结晶，通过改变起始组成的初始构成来控制“待形成的RE 123晶体中的RE和Ba之间的置换量”，例如通过将初始构成改变为更多的Ba 在相图上的123-211（或422）连接线上的组合物，在大气中产生RE 123型氧化物超导体，其表现出临界温度为90K或更高和更高的临界电流密度（Jc ）在磁场中。可以添加痕量的Pt或CeO 3以使211（或422）相微粉化，以进一步提高Jc。

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