Method of obtaining superconducting phase Nb3GexAl1 − x by thermal diffusion in the electrolytically formatted multilayer metal structure Nb/Ge/Al

Formation of the stable superconducting (SC) phase of intermetallide Nb3GexAl1 − x (x ≃ 0.2–0.30) by thermal annealing of multilayer structures of Nb/Ge/Al-like specimens under T = 1213 ± 20K in vacuum has been studied. The multilayer structures have been obtained by the method of electrochemical concretion of Ge and Al layers on Nb (Nb is a structural foundation). The critical (I c) currents that flow inside the specimens at the temperature of He in magnetic fields H ≫ HC2(Nb) have been measured; the critical densities of the current (j c) have been rated. The nature of the (j c) dependence on the time of annealing, the magnetizing force H(Tl), the layer thickness of Ge-hGe (mcm) (at hAl ≈ const), and the layer thickness of Al-hAl(mcm) (at hGe ≈ const) have been determined. A conclusion on the technological expediency of the electrochemical method of obtaining multilayer Nb/Ge/Al-like structures for the purpose of SC intermetallides formation by means of the thermal-diffusion method has been reached.