Electrodeposition of Niobium‐Germanium Alloys from Molten Fluorides

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Abstract
Niobium‐germanium alloys were obtained by electrodeposition from molten fluoride solutions containing 5 mol percent of , and various concentrations of in the eutectic solvent. The molten bath temperature was typically about 750°C. Cathodes (or substrates) were made of Mo and W foils, and a Ge sheet was used as a dissolving anode. Stable growth deposits were obtained of the intermetallic compounds , , , and their phase‐mixtures by varying the germanium ion concentration in the molten bath. Germanium was found to be more noble than niobium in the molten fluoride bath, thus facilitating the deposition of germanium rich alloys. The superconducting compound, , however, could not be obtained as a single‐phase deposit. It was obtained only as a minor constituent in certain phase‐mixtures when operating under extreme conditions.

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