THERMODYNAMICS OF INTERSTITIAL SOLID SOLUTIONS AND REFRACTORY COMPOUNDS. VAPORIZATION KINETICS OF NON-STOICHIOMETRIC COMPOUNDS.
Semi-annual progress rept. no. 2, 1 Sep 63-1 Mar 64,
MANLABS INC CAMBRIDGE MASS
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The purpose of the investigation is to calculate the vaporization kinetics of non-stoichiometric phases for both congruent and non-congruent vaporization based on the following assumptions 1 The mass transport of vaporizing species is not diffusion limited. 2 The solid and vapor phases are in quasi-static equilibrium. 3 The effective surface area remains constant. 4 No molecular vaporization occurs. 5 The vaporization rates of the individual constituents are given by the Langmuir rate equation. 6 The thermodynamic properties of the nonstoichiometric solid and vapor phases are described by the Schotty-Wagner lattice defect model developed by Kaufman, et al for refractory, interstitial compounds.