Oxide superconductors and method for producing same
    5.
    发明公开
    Oxide superconductors and method for producing same 失效
    Oxidische Supraleiter和Verfahren zu ihrer Herstellung。

    公开(公告)号:EP0476504A1

    公开(公告)日:1992-03-25

    申请号:EP91115377.3

    申请日:1991-09-11

    IPC分类号: C04B35/00 H01L39/24

    摘要: The present invention provides an oxide superconductor which has a relatively high transition temperature T c . This superconductor has the chemical formula (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₃O 7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 ≦ x ≦ 0.5, y is within the range of 0.1 ≦ y ≦ 0.4 and z is within the range of 0.05 ≦ z ≦ (x/2 + 0.5). The invention further provides a method for producing the oxide superconductor which comprises firing a composition of the formula (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₃O 7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 ≦ x ≦ 0.5 and y is within the range of 0.1 ≦ y ≦ 0.4 at a temperature of from 750°C to the melting temperature of the composition under an oxygen partial pressure P(O₂) of 0.001 atm ≦ P(O₂) ≦ 0.2 atm and then heat treating the composition to adjust the oxygen loss z to 0.05 ≦ z ≦ (x/2 + 0.5).

    摘要翻译: 本发明提供一种具有较高转变温度Tc的氧化物超导体。 该超导体具有化学式(R1-xCax)(Ba1-ySry)2Cu3O7-z,其中R是选自Tm,Yb和Lu中的至少一种稀土元素,x在0.1〜 x <0.5,y在0.1≤y≤0.4的范围内,z在0.05≤z≤(x / 2 + 0.5)的范围内。 本发明还提供了一种制备氧化物超导体的方法,其包括焙烧式(R1-xCax)(Ba1-ySry)2Cu3O7-z的组合物,其中R是选自Tm,Yb中的至少一种稀土元素 并且在750℃的温度下,Lu,x在0.1≤x≤0.5的范围内,y在0.1≤y≤0.4的范围内,相对于组合物的熔融温度 0.001atm的氧分压P(O 2)= P(O 2)≤0.2atm,然后热处理该组合物以将氧损失z调节至0.05≤z≤(x / 2 + 0.5) )。