Premium
Elastic, optical, and dielectric properties and their pressure derivatives of rutile‐structure oxides in a modified rigid ion approximation
Author(s) -
Striefler M. E.,
Barsch G. R.
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.2220670113
Subject(s) - dielectric , zero (linguistics) , ion , rutile , materials science , k nearest neighbors algorithm , bending , chemistry , condensed matter physics , thermodynamics , molecular physics , optics , physics , composite material , linguistics , philosophy , optoelectronics , organic chemistry , artificial intelligence , computer science
The elastic and static dielectric constants and their first pressure derivatives, and the optical mode frequencies and mode gammas at zero wave vector have been calculated for GeO 2 , TiO 2 , and SnO 2 from a modified rigid ion model, in which first and second nearest neighbor central force repulsive interaction of Born‐Mayer type and oxygen–cation–oxygen angle bending forces are included. The nine free parameters of the model are determined from a least squares fit to the zero pressure values of the optical frequencies and elastic constants. The agreement with the experimental optical and elastic data at zero pressure is very good, and fair to moderate for the pressure derivatives.