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Ferroelectrics Volume 367, 2008 - Issue 1
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SECTION A: BULK MATERIALS: SINGLE CRYSTALS, CERAMICS AND COMPOSITES

Temperature Evolution of the Optical Phonons in Pb(Ni1/3Nb2/3)O3 Single Crystals Studied by Raman Scattering

Jun Kano Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
,
Hiroki Taniguchi Materials and Structures Lab., Tokyo Institute of Technology, Nagatsuta, Midori, Yokohama, 226-8503, Japan
,
Desheng Fu Materials and Structures Lab., Tokyo Institute of Technology, Nagatsuta, Midori, Yokohama, 226-8503, Japan
,
Mitsuru Itoh Materials and Structures Lab., Tokyo Institute of Technology, Nagatsuta, Midori, Yokohama, 226-8503, Japan
&
Seiji Kojima Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
Pages 67-72 | Received 31 Aug 2007, Accepted 28 Mar 2008, Published online: 20 Sep 2010
 
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Abstract

Raman scattering of lead nickel niobate Pb(Ni 1/3 Nb 2/3 )O 3 (PNN) single crystals grown by the flux method has been performed to investigate the temperature dependence of the optical phonons of relaxors. Anomaly of the temperature dependence of the Raman intensity at 780 cm−1 was observed. Polar microregions promote the growth of volume gradually above the Curie temperature (∼ 170 K), and then freeze around 200 K. From the extrapolation of the temperature dependence of the depolarization ratio, we tried to estimate Burns temperature.

Acknowledgments

This work was supported in part by Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology, and the Murata Science Foundation.

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