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Free Enthalpy of Ternary Alloy Superlattice
Author(s) -
Šrobár F.
Publication year - 1982
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170170807
Subject(s) - superlattice , enthalpy , ternary operation , thermodynamics , alloy , materials science , ternary alloy , entropy (arrow of time) , chemistry , condensed matter physics , physics , metallurgy , computer science , programming language
Increments due to superlattice structure are formulated for the free enthalpy and some other thermodynamic entities as functions of composition, geometry parameters and temperature. Physical contents of the general expressions, derived for simple (quasi‐regular) pseudobinary solutions, are illustrated by numerical data valid for the In x Ga 1– x As/GaAs system. It is suggested that the free enthalpy of superlattice, is, at least at higher temperatures, largely dominated by the configuration entropy term. Corrections due to nonideality appear to be quite sizeable for the selected ternary alloy.