高融点金属と水素

概要

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Dissolution, diffusion, and permeation of hydrogen in refractory metals, namely the Va and Ⅵa group metals, are briefly reviewed. Heats of solution for hydrogen in the Va group metals with electron density, e/a, of 5 are about -8 kcal/mol, while those in the Ⅵa group metals with e/a of 6 are about +10 kcal/mol. Heats of solution for hydrogen in the metals, alloyed with other metals to vary the values of e/a ratio, change along a smoothly curved tie line between 4 and 6 of e/a with minor deviations, some of which can be explained in terms of density states at Fermi surface, atomic size effect, and/or lattice distortion. Activation energies for the diffusion and permeation are considered from similar points of view. Isotope effect and hydrogen embrittlement are also described.
富山大学の論文