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本文首次报道了锕系元素中的铀和钍与钇、钡和铜的氧化物组成四元金属氧化物体系的超导电性。测得两种不同铀含量超导体的零电阻温度(T_(co))分别为79K和87K,一种含钍超导体的零电阻温度为74K。由交流磁化率测量所得的超导电性与电阻测量的结果相近。用卢瑟福背散射以及~(16)O(d,p)~(17)O反应测定了含铀超导体中各元素在表层内的实际组分,发现与样品在煅烧前的名义组分有相当大的差别。由X射线衍射分析表明,含铀超导体中已不存在独立的铀氧化物和原料中其它氧化物,可能形成了与已知的单相超导氧化物不同的晶相结构。
This paper reports for the first time the superconductivity of tetravalent metal oxide systems composed of actinides containing uranium and thorium and yttrium, barium and copper oxides. The zero-resistance temperatures (T_ (co)) of the two superconductors with different uranium contents were measured to be 79K and 87K, respectively. The zero-resistance temperature of a thoriated superconductor was 74K. Superconductivity measured by AC susceptibility is similar to the result of the resistance measurement. The actual composition of each element in the uranium-containing superconductor in the surface layer was determined by Rutherford backscattering and ~ (16) O (d, p) ~ (17) O reaction. Quite a big difference. X-ray diffraction analysis shows that uranium-containing superconductors have no independent uranium oxide and other oxides in the raw materials, and may form a different crystal phase structure than known single-phase superconducting oxides.