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Hypersonic and Dielectric Studies of Relaxor Ferroelectric Single Crystal

Published online by Cambridge University Press:  15 February 2011

Chi-Shun Tu ,
V.H. Schmiidt ,
C.-H. Yeh ,
L.-F. Chen  and
C.-L. Tsai
Chi-Shun Tu
Affiliation:
Department of Physics, Fu-Jen University, Taipei, Taiwan 242, Republic of China
V.H. Schmiidt
Affiliation:
Department of Physics, Montana State University, Bozeman, MT 59717
C.-H. Yeh
Affiliation:
Department of Physics, Fu-Jen University, Taipei, Taiwan 242, Republic of China
L.-F. Chen
Affiliation:
Department of Physics, Fu-Jen University, Taipei, Taiwan 242, Republic of China
C.-L. Tsai
Affiliation:
Department of Physics, Fu-Jen University, Taipei, Taiwan 242, Republic of China
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Abstract

Both the longitudinal (LA) Brillouin back-scattering spectra and dielectric permittivity along the [001] direction have been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.68(PbTiO3)0.32 (PMN-32%PT). A sharp ferroelectric phase transition (which is associated with a Landau-Khalatnikov-like phonon damping maximum) was observed near 445 K. As temperature increases, a diffuse phase transition was detected near 280 K. In addition, the nature of the thermal hysteresis for the dielectric permittivity confirms that these transitions (near 280 and 445 K for heating procedure) are diffuse first-order and first-order, It respectively. The dielectric data prove the existence of an electric dipolar relaxation process below 300 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 604: Symposium LL – Materials for Smart Systems III , 1999 , 185
Copyright
Copyright © Materials Research Society 2000

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