Nonequilibrium statistical theory of diffusion of hydrogen atoms in metals with hexagonal close-packed lattice: Two regimes of migration

Abstract

In the framework of many-electron theory, the configurational potential relief of hydrogen atom in hexagonal close-packed metals is calculated. Using the data on the quantum states and the interaction mechanisms of impurity atom, two types of hydrogen transport are studied: high-temperature hopping and bandlike movement (tunneling transitions) at very low temperatures. Anharmonicity of hydrogen atom vibration is shown to have an effect on the relaxation processes owing to the interference with phonon scattering.