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    • 4. 发明授权
    • Method of manufacturing an oxide superconductor with high critical
current density
    • 具有高临界电流密度的氧化物超导体的制造方法
    • US5665682A
    • 1997-09-09
    • US514731
    • 1995-08-14
    • Osamu OkamuraAtsushi KumeYuh Shiohara
    • Osamu OkamuraAtsushi KumeYuh Shiohara
    • C01G1/00C01G3/00H01B12/06H01B13/00H01L39/24B05D5/12B05D3/02
    • H01L39/2483Y10S505/734
    • An oxide superconductor capable of realizing a high critical current density and its manufacturing method requiring only a low temperature heat treatment. An oxide superconductor has a superconductive layer with a composition of RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x, where RE stands for any one of rare earth elements including Y, Eu, Gd, Dy, Ho, Er, and Yb, which is formed on the substrate by RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x phase and CuO phase resulting from a decomposition of RE.sub.1 Ba.sub.2 Cu.sub.4 O.sub.8 phase, in which the CuO phase and micro-defects caused by the decomposition function as pinning centers. This superconductive layer is formed by applying a solution containing organic compounds of a plurality of metallic elements for constituting the oxide superconductive layer; calcining the substrate applied with the solution to obtain a calcined body in which the organic compounds contained in the solution are thermally decomposed; heating the calcined body to produce RE.sub.1 Ba.sub.2 Cu.sub.4 O.sub.8 phase; and decomposing the RE.sub.1 Ba.sub.2 Cu.sub.4 O.sub.8 phase into RE.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x phase and CuO phase, to obtain the oxide superconductor.
    • 能够实现高临界电流密度的氧化物超导体及其仅需要低温热处理的制造方法。 氧化物超导体具有具有RE1Ba2Cu3O7-x组成的超导层,其中RE代表包括Y,Eu,Gd,Dy,Ho,Er和Yb的稀土元素中的任何一种,其通过RE1Ba2Cu3O7- x相和CuO相由RE1Ba2Cu4O8相分解产生,其中CuO相和微分子缺陷引起的分解作用为钉扎中心。 该超导层通过涂布含有用于构成氧化物超导层的多个金属元素的有机化合物的溶液而形成; 煅烧施加有溶液的基板以获得其中包含在溶液中的有机化合物热分解的煅烧体; 加热煅烧体产生RE1Ba2Cu4O8相; 并将RE1Ba2Cu4O8相分解成RE1Ba2Cu3O7-x相和CuO相,得到氧化物超导体。
    • 5. 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)。
    • 7. 发明授权
    • Superconductor and precursor therefor, their preparation and use of
superconductor
    • 超导体及其前体,其超导体的制备和使用
    • US5872079A
    • 1999-02-16
    • US762211
    • 1996-12-06
    • Masaru NakamuraYasuji YamadaJian-Guo WenYuh ShioharaShoji Tanaka
    • Masaru NakamuraYasuji YamadaJian-Guo WenYuh ShioharaShoji Tanaka
    • C04B35/45C01G1/00C01G3/00H01B12/02H01B13/00H01L39/12H01L39/24H01B12/00C04B35/50C04B35/622
    • H01L39/126Y10S505/78Y10S505/819
    • A superconductor comprising a compound of the formula (II):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II)wherein not less than 40% of a crystal of the superconductor shows phase separation, and at (temperature, magnetic field) of (77�K!, O�T!) and (77�K!, 4�T!), a critical current density is not less than 10,000 A/cm.sup.2, which is obtained by heating a precursor which is a solid solution of the formula (I):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y (I)wherein not more than 10% of a crystal of the solid solution shows phase separation, so that phase separation is formed in the crystals at a phase separation temperature, and introducing oxygen; and a superconductor comprising a compound of the formula (II):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II)wherein not more than 10% of a crystal of the superconductor shows phase separation, and in a magnetic field of not less than 1�T! at a constant temperature of 77�K!, a critical current density is less than 10,000 A/cm.sup.2, which is obtained by introducing oxygen into the precursor (I) at a temperature less than the lower limit of the phase separation temperature. According to the method of the present invention, a superconductor having a high Jc or having different properties with respect to Jc, which is unobtainable by the conventional production method, can be obtained using the conventional materials.
    • 包含式(II)化合物的超导体:R1 + xBa2-xCu3O7-y1(II)其中不低于40%的超导体的晶体显示相分离,并且在(77℃)的(温度, K],O [T])和(77 [K],4 [T]),临界电流密度不小于10,000A / cm 2,这是通过加热作为式 I):R1 + xBa2-xCu3O7-y(I)其中不超过10%的固溶体晶体显示相分离,从而在相分离温度下在晶体中形成相分离并引入氧; 以及包含式(II)的化合物的超导体:R1 + xBa2-xCu3O7-y1(II)其中不超过10%的超导体的晶体显示相分离,并且在不小于1 [ T]在77 [K]的恒定温度下,临界电流密度小于10,000A / cm 2,其通过在低于相分离温度的下限的温度下将氧引入前体(I)而获得。 根据本发明的方法,可以使用常规材料获得具有高Jc或具有相对于Jc的不同性能的超导体,其通过常规制备方法是不可获得的。