The assumption of the local equilibrium ofhydrogen distribution in metals[1]was used in themodel formerly developed[2]to describe the diffu-sion of hydrogen in
The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysiswere determined by EMF with Naβ-Al<sub>2</sub>O<sub>3</sub>
1.IntroductionRecently Daw and Baskes[1,2]proposed the embedded atom model(EAM)on the basisof quasi-atom concept[3]and density-function theory.It is applicable