Premium
On the long‐wavelength behaviour of solids with fluorite structure
Author(s) -
Bedi S. S.,
Verma M. P.
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.2220940134
Subject(s) - fluorite , raman spectroscopy , wavelength , mineralogy , ion , order (exchange) , materials science , chemical physics , chemistry , physics , optics , metallurgy , economics , organic chemistry , finance
A rigid‐ion Lundqvist many‐body potential model is used to derive expressions of the second‐order elastic (SOE) constants and the principal Raman frequency for solids crystallizing in the fluorite structure. Application to CaF 2 , SrF 2 , and BaF 2 clearly demonstrates the inadequacy of the Born potential and the importance of three‐body interactions in this system.