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首页> 外文期刊>Journal of Applied Physics >Resistivity, superconductivity, and order‐disorder transformations in transition metal carbides and hydrogen‐doped carbides
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Resistivity, superconductivity, and order‐disorder transformations in transition metal carbides and hydrogen‐doped carbides

机译：过渡金属碳化物和氢掺杂碳化物中的电阻率，超导性和有序无序转换

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Electron transport in transition metal carbides was investigated, with special attention to ordering effects in substoichiometric specimens and to the influence of hydrogen doping. Hydrided carbides specimens showed reduced resistivity values, a result attributed to the reduction of defect scattering as the carbon vacancies were filled with substitutional hydrogen ions. The effect of the order‐disorder transformation NbC0.83 = Nb6C5 at 1030 °C was also to reduce defect scattering as the carbon vacancies became incorporated into the periodic potential of the ordered phase. As another illustration of vacancy scattering, the resistivities of non‐stoichiometric HFCx and stiochiometric WC were compared. The superconducting transition temperatures of partially ordered Nb6C5 and hydrided NbCx decreased from those of the original specimens, disordered NbC0.83 and NbCx, respectively. The normal state resistivity of Nb6C5 displayed the  bulge  in its temperature dependence characteristic of high Tc superconducters. New data on the normal state resistivity and superconducting transition of single crystal NbC0.98 and TaC0.98 are presented, and a theorectical relation linking normal state resistivity and superconductivity is developed.
机译：研究了过渡金属碳化物中的电子传输，并特别注意了亚化学计量样品中的有序效应和氢掺杂的影响。氢化碳化物样品的电阻率值降低，这是由于碳空位被置换氢离子填充而导致的缺陷扩散减少的结果。当碳空位并入有序相的周期性电势中时，在1030°C下有序无序转变NbC0.83 = Nb6C5的作用还可以减少缺陷的扩散。作为空位散射的另一个例证，比较了非化学计量HFCx和化学计量WC的电阻率。部分有序的Nb6C5和氢化NbCx的超导转变温度分别比原始样品的无序NbC0.83和NbCx降低。 Nb6C5的常态电阻率在高Tc超导体的温度依赖性特性中显示出“凸起”。给出了单晶NbC0.98和TaC0.98的常态电阻率和超导转变的新数据，并建立了联系常态电阻率和超导性的理论关系。

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    《Journal of Applied Physics》 |1982年第12期|P.8915-8927|共13页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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