Stability of hydrogen and nitrogen in group VIa metals (Cr, Mo, W) and iron-group metals (Fe, Co, Ni) evaluated by statistical thermodynamics

Abstract

Solubility data of hydrogen and nitrogen in group VIa metals (Cr, Mo, W) and iron-group metals (Fe, Co, Ni) were analysed on the basis of statistical thermodynamics. The stabilities of hydrogen in iron-group metals were estimated to be comparable to one another and the same appeared to be true for nitrogen solutions. On the other hand, stabilities of nitrogen in group VIa metals worsened appreciably as the number of the period increased. The same trend seemed to be valid for hydrogen solution in group VIa metals but with a smaller extent of worsening stability.