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research article

Dynamics of polar clusters in relaxor ferroelectrics

Kamba, S.
•
Kempa, M.
•
Berta, M.
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2005
Journal De Physique Iv

The paper brings results of far infrared transmission studies of relaxor ferroelectric PbMg1/3Nb2/3O3 and PbSc1/2Ta1/2O3 thin films performed at temperatures between 10K and 900K. The spectra clearly show that the lowest-frequency polar optic phonon softens (partially) neither towards the temperature of dielectric-constant maxima, nor towards the freezing temperature, but towards the Burns temperature. This indicates that it represents the ferroelectric soft mode inside the polar clusters. The dielectric relaxation, which expresses the dynamics (flipping and breathing) of polar clusters, appears in THz range below the Burns temperature. This relaxation dramatically slows down to sub-Hertz region on cooling to freezing temperature near 200 K (in PMN) or to T-c (in PST). Another heavily damped excitation remains in the spectra below 30 cm(-1) down to 10K. This mode was assigned to the E component of the split Flu soft mode.

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Type
research article
DOI
10.1051/jp4:2005128019
Web of Science ID

WOS:000232430400020

Author(s)
Kamba, S.
•
Kempa, M.
•
Berta, M.
•
Petzelt, J.
•
Brinkman, K.  
•
Setter, N.  
Date Issued

2005

Published in
Journal De Physique Iv
Volume

128

Start page

121

End page

126

Subjects

pb(sc1/2ta1/2)o-3 ceramics

•

phase-transitions

•

soft mode

•

pb(mg1/3nb2/3)o-3

•

pbmg1/3nb2/3o3

Note

Kamba, S Acad Sci Czech Republ, Inst Phys, Slovance 2, Prague 18221 8, Czech Republic Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic EPFL, Swiss Fed Inst Technol, Ceram Lab, CH-1015 Lausanne, Switzerland

972CB

Cited References Count:17

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LC  
Available on Infoscience
August 21, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/233565
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