Isotope effect in the solubility of hydrogen in F.C.C. metals

Abstract

A method for calculating the isotope effect in the solubility of hydrogen isotopes in f.c.c. metals is proposed. Compared with the previously performed calculations [3 to 5], where only local vibrations of interstitial atom were considered, the change in density of states of solution in the continuous spectrum band is discussed in the present paper. Elastic vibration spectrum analysis of the crystal with an impurity atom in internode is performed in harmonic approximation, utilizing the model of equal central and non‐central interactions between atoms. It is shown that the contribution of the change of a continuous spectrum band to the value of solubility (and isotope effect) is rather small and increases with the increase of temperature and the decrease of principle matrix atom mass.

Interaction of Copper Alloys with Hydrogen

“…(2) and (4) for diluted solutions (Oriani R.A., 1970): (2), (4), (7) and (8) for the lattice parameters D 0 , E d , K S,0 and E s and trapping parameters E t and N t over the correspondent temperature range of influence. The value of 8.5  10 28 m -3 is taken for the density of solution sites into the lattice N l , assuming that the copper alloy is close to a fcc structure where hydrogen occupies only the octahedral interstitial positions (Vykhodets et al, 1972).…”