Hydrogen absorption and its effect on low-temperature electric properties of niobium
Hydrogen absorption and its effect on low-temperature electric properties of niobium
复制标题
铌的吸氢及其对低温电性能的影响
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
S. Isagawa
中科院分区：
文献类型：
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作者：
S. Isagawa
掺氢引起的铌箔样品的超额电阻率随掺氢浓度的增加而增加，掺氢浓度达8-12 at.% H，几乎与温度无关。室温或更高温度下的Nb-H结构通过相对快速的冷却淬火至77 K或9.5 K。观察到电阻率的突然下降，这对应于有序的正交氢化物相的沉淀。超导转变温度Tc对α固溶体中氢浓度相当不敏感。然而，氢化物相在低于1.3K时没有显示出超导性的迹象。氢被发现在超高压除气后，通过存储在空气中或通过浸泡在蚀刻剂中被再吸收在铌。这通过称量样品并通过质子NMR测量进行交叉检查来确认。
The excess resistivity of niobium foil samples due to doped hydrogen increases with concentration up to 8–12 at.% H, which is almost independent of temperature. The Nb‐H structure at room temperature or above is quenched to 77 K or 9.5 K by relatively rapid cooling. The abrupt decrease of resistivity is observed, which corresponds to the precipitation of the ordered orthorhombic hydride phase. The superconducting transition temperature Tc is rather insensitive to hydrogen concentration in α solid solution. Hydride phase, however, shows no sign of superconductivity down to 1.3 K. Hydrogen is found to be reabsorbed in niobium after UHV outgassing by storage in air or by immersion in etchants. This is confirmed by weighing the samples and cross‐checked by the proton NMR measurements.