On Nachtrieb's Tm/T Law for Diffusion in Solids under Pressure and Its Relation to Simon's Melting Equation

Abstract

Nachtrieb's T_m/T law for diffusion in solids under pressure is derived under the assumption that the melting curve of the solid can be described by Simon's melting equation. A necessary condition for the T_m/T law to hold is that the activation energy ΔH and volume ΔV obey an equation ΔH = AcΔV, where A and c are the Simon constants. This equation is substantiated by a comparison with the available experimental data.