The Sublimation Kinetics of GeSe Single Crystals

The sublimation kinetics of (001) oriented GeSe single crystal platelets was studied by means of high temperature mass spectroscopy, quantitative vacuum microbalance techniques and hot stage optical microscopy. Solid GeSe sublimes under non‐equilibrium conditions according to the reaction GeSe(s) → GeSe(g). The activational enthalpy and entropy for the mean experimental temperature 563°K are ΔH563* = 32.3 kcal/mol and ΔS563* = 19.1 eu. The vaporization coefficient α is less than unity for the temperature range studied and α decreases with increasing temperature. The combined experimental data are correlated by means of a multi‐step surface adsorption mechanism. Copyright © 1975 Verlag GmbH & Co. KGaA, Weinheim