Accession Number : AD0609348

Title :   THERMODYNAMICS OF INTERSTITIAL SOLID SOLUTIONS AND REFRACTORY COMPOUNDS. VAPORIZATION KINETICS OF NON-STOICHIOMETRIC COMPOUNDS.

Descriptive Note : Semi-annual progress rept. no. 2, 1 Sep 63-1 Mar 64,

Corporate Author : MANLABS INC CAMBRIDGE MASS

Personal Author(s) : Bernstein,Harold ; Kaufman,Larry

Report Date : 15 MAR 1964

Pagination or Media Count : 45

Abstract : 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.

Descriptors :   (*REFRACTORY MATERIALS, THERMODYNAMICS), (*SOLID SOLUTIONS, THERMODYNAMICS), (*SUBLIMATION, DYNAMICS), VAPORIZATION, PHASE STUDIES, REFRACTORY METALS, CARBIDES, NITRIDES, OXIDES, MATHEMATICAL MODELS, CERAMIC MATERIALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE