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Temperature dependence of the A 1 and E optical phonons in BaTiO 3
Author(s) -
Scalabrin A.,
Chaves A. S.,
Shim D. S.,
Porto S. P. S.
Publication year - 1977
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.2220790240
Subject(s) - phonon , condensed matter physics , dielectric , tetragonal crystal system , anisotropy , atmospheric temperature range , transverse plane , materials science , phase (matter) , crystal (programming language) , range (aeronautics) , optics , chemistry , physics , thermodynamics , optoelectronics , organic chemistry , structural engineering , engineering , computer science , composite material , programming language
Measurements of all A 1 and E transverse and longitudinal phonons in BaTiO 3 are reported in the temperature range 10 to 132 °C where the crystal is in the tetragonal phase. A least squares fitting of the spectral shapes is done and the resulting temperature dependence of the frequencies, linewidths and coupling parameters is presented. The temperature dependence of the phonon and electron contribution to the dielectric constant, ε, in the c ‐ and α‐axes is determined and compared to the capacitance measurements. It is found that the dielectric constant discrepancy is highly anisotropic.