Superconductivity of Ti-Nb-Si Alloys Crystallized from the Amorphous State

概要

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This paper presents the relationship between superconducting properties and crystallization behavior of Ti-Nb-Si amorphous alloys. Continuous amorphous tapes with complete bend ductility were prepared in a limited composition range of Ti-Nb-Si ternary system. The superconducting properties (T_c, J_c and H_c) of these alloys improved remarkably on crystallization. The improvement in superconductivity after crystallization was attributed to the precipitation of a b. c. c. β-phase of titanium containing a large amount of niobium in solid solution. The T_c value increased with increasing niobium content and the highest value attained was about 9.9 K for Ti_<45> Nb_<40>Si_<15> alloy annealed for 1 h at 1023 K. The same tendency was recognized for J_c and H_c, and the highest values were about 1.2×10^5 A/cm^2 at zero applied field and 4.2 K and more than about 7.2×10^6 A/m at 4.2 K for Ti_<50>Nb_<35>Si_<15>. These values of T_c, J_c and H_c are almost of the same order as those of conventional superconducting Ti-Nb binary alloys. The easy formation of continuous amorphous tapes with highly ductile nature suggests the prospect of alternative methods for the production of superconducting materials.
東北大学の論文
1980-03-29