Abstract
The movement of solid-vapor interfaces through transport in the vapor phase has been analyzed by various authors for the case of a single component. When two components exist, the vapor contains more than one species. Such a case has often been analyzed using the total vapor pressure for such systems. We present here an analysis, allowing for preferential evaporation of one species and consequent surface enrichment of the less-volatile species. This leads to a velocity of motion of the form 1/V=1/VA+1/VB, where VA and VB represent fictional velocities obtaining if only one species is rate controlling. Comparisons are made with some available data on congruently vaporizing compositions of mixed oxides and on the movement of lenticular voids in mixed oxides along thermal gradients, with very reasonable agreements obtained.
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