Production and Superconducting Properties of Diffusion Coatings of Indium, Cadmium, Lead, Thallium, Bismuth, and Zinc on Vanadium
The interaction of In, Cd, Pb, Tl, Bi, and Zn vapor with vanadium wire is studied after holding isothermally for 1 to 20 h at 1000 to 1200° in evacuated quartz ampoules. X-ray analysis of the resultant binary diffusion coatings reveals the formation of V3In (a = 5.28-5.56 Å), V3Cd (a = 4.92-4.95 Å), V3Pb (a = 4.87 Å), V3Tl (a = 5.21-5.25 Å), and V3Bi (a = 4.72 Å), with the Cr3Si structure. The existence of a compound V3Zn with an analogous structure appears quite likely. The x-ray diffraction pictures of the coatings also show the lines of vanadium (the base) and those of a third phase, the crystal structure of which remains unsolved. The critical superconducting temperature of the compound V3Zn obtained by the diffusion method is 13.9°K. The rest of the compounds obtained are not superconducting above 4.2°K.
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