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Resonance energy shift for mössbauer impurity atoms trapped by vacancies
Author(s) -
Tewari A. K.,
Roy S. K.,
Bhattacharya D. L.
Publication year - 1979
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.2220950233
Subject(s) - impurity , vacancy defect , condensed matter physics , debye , hamiltonian (control theory) , lattice (music) , atomic physics , materials science , chemistry , physics , mathematical optimization , mathematics , organic chemistry , acoustics
An estimation of the second order Doppler shift is made for a simple lattice model containing impurities and vacancies by employing the double time Green's function technique at the high temperature limit. The changes in the force constants due to the presence of substitutional impurities and the vacancies near to the impurity are evaluated from the Debye relation and are used to estimate the contributions. It is found that the two contributions (one due to the impurity and the other due to the vacancy near to the impurity) arising from the last two terms of the lattice Hamiltonian yield a negative shift of the absorption line, which is expected to be significant for high concentrations of point defects.