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    • 37. 发明授权
    • Method of retaining melt of oxide
    • 保留氧化物熔体的方法
    • US5632811A
    • 1997-05-27
    • US420519
    • 1995-04-12
    • Yasuo NamikawaYasuji YamadaSatoshi KoyamaYuh ShioharaShoji Tanaka
    • Yasuo NamikawaYasuji YamadaSatoshi KoyamaYuh ShioharaShoji Tanaka
    • C30B9/00C30B15/00C30B15/12C30B29/22H01B13/00H01L21/208C30B29/16
    • C30B29/225C30B15/12C30B9/00
    • In order to stably retain an oxide-based melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen at a prescribed temperature with no impurity contamination thereby preparing a large oxide crystal of high quality from the melt, an oxide melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen is stored in a first crucible, which in turn is held in a second crucible. The first crucible is made of a material which is an oxide of at least one element forming the melt having a melting point higher by at least 10.degree. C. than a melt retention temperature and causing no structural phase transition up to a temperature higher by 10.degree. C. than the aforementioned prescribed temperature, with solubility of not more than 5 atomic percent with respect to the melt in a temperature range from the room temperature to a temperature higher by 10.degree. C. than the melt retention temperature. The second crucible is made of a material substantially causing neither melting nor chemical reaction with respect to the oxide-based melt, which can retain the melt more stably than the first material. Even if the melt overflows the first crucible, this overflow is suppressed by the second crucible. It is possible to prepare a crystal of an oxide superconductor such as YBa.sub.2 Cu.sub.3 O.sub.7-x (0.ltoreq.X.ltoreq.1) by the pulling method from the melt which is stored in the first crucible.
    • 为了稳定地保持基本上由钇或镧系元素,钡,铜和氧组成的氧化物基熔体,在规定的温度下没有杂质污染,从而从熔体制备高质量的大的氧化物晶体,基本上由 的钇或镧系元素,钡,铜和氧储存在第一坩埚中,第一坩埚又保持在第二坩埚中。 第一坩埚由至少一种形成熔体的元素的氧化物的材料制成,其熔点比熔融保持温度高至少10℃,并且不会导致结构相变达到高于10℃的温度 ℃以上的规定温度,相对于熔体,在室温至高于熔融保持温度10℃的温度范围内的溶解度为5原子%以下。 第二坩埚由相对于基于氧化物的熔体基本上不熔化和化学反应的材料制成,其可以比第一材料更稳定地保持熔体。 即使熔体溢出第一坩埚,这种溢流被第二坩埚抑制。 可以通过从存储在第一坩埚中的熔体的拉伸方法制备氧化物超导体的晶体,例如YBa2Cu3O7-x(0≤X1)。