Abstract
The diffusivity of hydrogen in niobium (Cb), tantalum and three niobium-tantalum alloys has been measured at 296 K by a macroscopic technique based on the Boltzmann-Matano analysis. The hydrogen diffusivity extrapolated to zero concentration does not vary linearly with alloy concentration but rather appears to be less than would be predicted by a linear interpolation between the diffusivity of hydrogen in pure niobium and tantalum. The dependence of hydrogen diffusivity on hydrogen concentration was also determined. In each alloy, the diffusivity was found to decrease with increasing hydrogen concentration. The diffusion coefficient for hydrogen decreased by approximately a factor of two as the hydrogen concentration increased from zero to the solubility limit in each metal.
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