Elastic softening and central peaks in BaTiO3 single crystals above the cubic-tetragonal phase-transition temperature

Title
Elastic softening and central peaks in BaTiO3 single crystals above the cubic-tetragonal phase-transition temperature
Authors
Jung, J.H.; Won, C.J.; Hur, N.J.
Keywords
Elastic softening, central peaks, BaTiO3, temperature
Issue Date
2008-09
Publisher
American Institute of Physics
Abstract
A strong relaxation mode was observed in the paraelectric phase of barium titanate (BaTiO3) single crystals by Brillouin scattering study and was found to correlate with the softening of the longitudinal acoustic mode and the increase in the hypersonic damping. These observations support the existence of polar percursors and their electrostrictive coupling with the strain caused by the acoustic waves, consistent with former studies evidencing off-centered Ti ions in the high-symmetry cubic phase. A critical slowing down has been clearly observed in the vicinity of the cubic-tetragonal phase transition, indicating order-disorder component contributes to the phase transition of BaTiO3.
URI
http://dspace.inha.ac.kr/handle/10505/1529
ISSN
0003-6951
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
Files in This Item:
Elastic.pdfDownload

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse