Superconductive Transition Point of Tantalum and Niobium as a Reference Temperature

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概要

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• The applicability of the superconductive transition point of Ta and Nb for use as a temperature reference point was examined. An unusual impurity effect was found in both metals; In a plot of the transition temperature (T_c) vs. the inverse resistance ratio (1/Γ), a substitutional impurity had a larger reducing effect on T_c than an interstitial impurity. The purest specimens we obtained, with Γ=5000 for Ta and Γ=4500 for Nb, were prepared by zone-melting and subsequent annealing just below the melting points under ultra-high vacuum. From their T_c values and analyses of the impurity effect, the T_c values of impurity-free Ta and Nb were determined as 4.4924 K and 9.2877 K, respectively, based on the 1976 Provisional 0.5 K to 30 K Temperature Scale, the currently-accepted temperature standard.

• 社団法人応用物理学会の論文
• 1980-08-05

著者

• Inaba Akira

  National Research Laboratory Of Metrology

関連論文

• Superconductive Transition Point of Tantalum and Niobium as a Reference Temperature

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