A probabilistic kinetic model for gas-solid (particularly hydrogen-metal) reactions, controlled by a phase transformation step, is presented. The transformation is assumed to occur in small aggregates of atoms (structural transformations units) with a transition probability which depends on the occupation of the structural unit by the gas (e.g., hydrogen) atoms. The weighed contributions of all possible occupancies are considered. The model predicts the pressure-temperature dependence of the product-reactant (hydrogen-metal) interface growth rate. The general properties of the growth rate functions that are derived and the evaluation of the various parameters which appear in these functions are discussed.
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry