RAMAN-STUDY OF FERROELECTRIC BISMUTH LAYER-OXIDES ABI(4)TI(4)O(15)

Authors
KOJIMA S IMAIZUMI R HAMAZAKI S TAKASHIGE M
Citation
S. Kojima et al., RAMAN-STUDY OF FERROELECTRIC BISMUTH LAYER-OXIDES ABI(4)TI(4)O(15), Journal of molecular structure, 348, 1995, pp. 37-40
Citations number
7
Categorie Soggetti
Chemistry Physical
Journal title
Journal of molecular structure → ACNP
ISSN journal
00222860
Volume
348
Year of publication
1995
Pages
37 - 40
Database
ISI
SICI code
0022-2860(1995)348:<37:ROFBLA>2.0.ZU;2-3
Abstract
The optical phonon modes have been studied by Raman spectroscopy in bi smuth layer-structure oxides ABi(4)Ti(4)O(15) (A=Ba,Ca,Pb,Sr). Althoug h the bands higher than 50 cm(-1) reveal no remarkable temperature dep endence, the low frequency modes change markedly. As for CaBi4Ti4O15 a nd SrBi4Ti4O15 the underdamped soft modes were clearly observed. In co ntrast, in BaBi4Ti4O15 only low-frequency overdamped modes have been o bserved. In PbBi4Ti4O15 the low-frequency spectra have a complicated s tructure and the softening of the underdamped modes was not observed c learly.