High-T superconductor and process for preparing it
    1.
    发明授权
    High-T superconductor and process for preparing it 失效
    高T超导体及其制备方法

    公开(公告)号:US5413980A

    公开(公告)日:1995-05-09

    申请号:US573038

    申请日:1990-08-23

    摘要: Polycrystalline high-T.sub.c superconductors of the formula M.sub.m E.sub.e RO.sub.x, which contain grains which are crystallographically aligned to the greatest possible extent, where M is at least one trivalent element such as a lanthanide element, E is at least one divalent element such as an alkaline earth element and R is at least one transition metal such as Cu, and x denotes the proportion of oxygen, are obtained by substituting a part of the alkaline earth element by a foreign element, preferably an alkali-metal element, which is no longer present in the product after the reaction sintering and sintering except for contents in the ppm to parts per thousand range and brings about the orientation effect. This produces a material which contains a slight deficit of E and optionally M, has an unaltered critical temperature and is substantially more resistant to external agents than equivalent known materials. A post-treatment in a stream of air or oxygen is unnecessary. Single crystals having relatively large dimensions can also be produced in a corresponding manner.

    摘要翻译: PCT No.PCT / EP89 / 00163 Sec。 371日期1991年10月9日 102(e)日期1991年10月9日PCT提交1989年2月22日PCT公布。 出版物WO89 / 08330 日期:1989年9月8日。具有式MmEeROx的多晶高Tc超导体,其含有在最大可能程度上在晶体学上排列的晶粒,其中M是至少一种三价元素,例如镧系元素,E是至少一个二价 元素如碱土金属元素和R是至少一种过渡金属如Cu,x表示氧的比例,通过用一种异种元素,优选碱金属元素代替一部分碱土金属元素, 在反应烧结和烧结之后不再存在于产物中,除了ppm至千分之一的范围内的含量,并导致取向效果。 这产生含有轻微缺乏E和任选的M的材料具有未改变的临界温度,并且比等同的已知材料显着地更好地抵抗外部试剂。 在空气或氧气流中的后处理是不必要的。 也可以以相应的方式制造具有相对较大尺寸的单晶。