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Theoretical Study of Refractive Indices, Birefringence and Spontaneous Polarization of BaTiO 3 and KNbO 3 in the Tetragonal Phase
Author(s) -
Chaib H.,
Khatib D.,
Kinase W.
Publication year - 1999
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/(sici)1521-3951(199908)214:2<453::aid-pssb453>3.0.co;2-l
Subject(s) - birefringence , tetragonal crystal system , polarization (electrochemistry) , refractive index , dipole , phase (matter) , condensed matter physics , materials science , optics , molecular physics , chemistry , physics , organic chemistry
The microscopic mechanism of refractive indices, birefringence and spontaneous polarization of BaTiO 3 and KNbO 3 in the tetragonal phase is discussed by using a microscopic model. In this model, we have taken account of a quantum method based upon the orbital approximation and the dipole–dipole interaction due to the local field acting on the constituent ions. It is found that the electronic polarizabilities play a major role in these calculations and that the obtained results of the refractive indices, birefringence δ n and spontaneous polarization are in good agreement with the experimental data.