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Equilibria and elevated‐temperature x‐ray studies show that a solid solution of hydrogen in niobium is produced throughout most of the system. A miscibility gap was found at low temperatures and pressures with a critical point at about 140°C, 0.01 mm of mercury hydrogen pressure, and 0.3 H/Nb. Sorption rates at 300°–550°C were initially linear. At higher temperatures, sorption rates were controlled by diffusion in the metal matrix. Diffusion coefficients at 600°–700°C can be expressed by: D=0.0215exp][)(−9370±600/RT Desorption rates were slower than those predicted by diffusion.

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