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    • 2. 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。