Abstract
1. Melting Nb−Al−Ge alloys with 60–85 at. % Nb (88. 5–95 wt. %) in a vacuum arc furnace, with a nonconsumable electrode ensures fairly precise composition and good quality of the ingots. 2. On the diagram of composition vs superconducting transition temperature for alloys of the Nb−Ge−Al system there is a region of alloys with Tc>16°K. This region is bounded by alloys with 75–76 at. % (89. 6–91. 6 wt. %) Nb, 3–5 at. % (2.8–4.5 wt. %) Ge, and the rest aluminum. To obtain high values of Tc it is necessary that the ratio of niobium to the total concentration of aluminum+germanium be strictly controlled —75–76:24–25.
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