Abstract
The interstitial solid-solubility of oxygen in niobium has been studied by means of X-ray diffraction, micrographic and thermal techniques using both a dynamic leak method and a Sieverts apparatus. The lattice parameter of degassed, zone-refined niobium was found to be 3.2986 Å, which is much lower than hitherto published values. At pressures above 10 −11 torr O 2, Nb is in thermodynamic equilibrium with oxide vapor and can take up to 6 at.% O 2 into solid solution at 1775°C. Above this temperature oxidation is “catastrophic” and the volatile oxides Nb 2O, NbO and Nb 2O 5 form on the surface. The “degassing” of Nb at 2200°C and above at a pressure of 10 −6 torr O 2 is, in effect, brought about by the volatilization of the oxide and not by the de-adsorption of gaseous oxygen.
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