Premium
Studies on substitutional defects in alkali halide crystals
Author(s) -
Paul S.,
Sengueta S.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220680231
Subject(s) - halide , alkali metal , simple (philosophy) , constant (computer programming) , relaxation (psychology) , thermodynamics , expression (computer science) , chemistry , harmonic , materials science , condensed matter physics , physics , inorganic chemistry , quantum mechanics , social psychology , psychology , philosophy , organic chemistry , epistemology , computer science , programming language
A simple model is developed for the study of substitutional defects. Region I consists of nearest neighbours to the defect site. In region II, the relaxation is taken ∼1/ r 2 and the constant is determined from the equilibrium condition. Using harmonic approximation an extremely simple expression for the heat of formation is obtained. Values of heat of formation obtained from this expression show good agreement with experiment and with those obtained from more sophisticated models.