Abstract
The phase composition of niobium specimens obtained by crystallization from the gaseous chloride-hydrogen mixture with regular addition of oxygen has been studied by the method of X-ray phase analysis. It is established that the oxygen-containing niobium contains a solid solution of oxygen in niobium monoxide. The specific feature of the phases revealed is an unusually pronounced deformation of the crystal lattice (with an increase in the oxygen content in the specimen, the lattice parameter increases by 0.5–0.6%). It is concluded that oxygen possesses elevated solubility in niobium and that during their gas-phase crystallization oxygen is present in niobium monoxide in a “superstoichiometric” concentration. The results obtained are compared with the known data on oxygen-enriched tungsten and chromium also obtained by various modifications of gasphase technology.
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