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Dispersion of the oblique phonons in tetragonal BaTiO 3 and Ce: BaTiO 3
Author(s) -
Wang RongPing,
Jiang YiJian,
Zeng LingZhi,
Liu YuLong,
Zhu Yong
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250260407
Subject(s) - phonon , tetragonal crystal system , raman spectroscopy , ferroelectricity , raman scattering , condensed matter physics , materials science , dispersion (optics) , phase (matter) , phase transition , optics , mineralogy , crystallography , chemistry , dielectric , crystal structure , physics , optoelectronics , organic chemistry
Raman spectra of oblique phonons in tetragonal BaTiO 3 and Ce : BaTiO 3 single crystals were obtained for different values of the angle θ which the phonon wavenumber q̄ makes with the c ‐axis. On the basis of Merten's equation, the directional dispersion curves were fitted and plotted. The results show that the A 1 (TO) phonons of BaTiO 3 at 275 and 514 cm −1 come from first‐order scattering, which is evidence for the order—disorder model of the ferroelectric phase transition. The Raman spectra of Ce : BaTiO 3 are reported for the first time and the results indicate that Ce atoms have little effect on the structure of BaTiO 3 .
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