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Phase transition and the soft lattice mode of a perovskite crystal studied by Raman scattering and thermal measurements

Published online by Cambridge University Press:  31 January 2011

H. R. Xia ,
L. X. Li ,
J. Q. Wei ,
J. Y. Wang ,
Z. H. Yang ,
Q. C. Guan  and
W. L. Jiang
H. R. Xia
Affiliation:
Department of Physics and National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
L. X. Li
Affiliation:
Experimental Center, Shandong University, Jinan 250100, People's Republic of China
J. Q. Wei
Affiliation:
Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
J. Y. Wang
Affiliation:
Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
Z. H. Yang
Affiliation:
Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
Q. C. Guan
Affiliation:
Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
W. L. Jiang
Affiliation:
Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
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Abstract

The paraelectric–ferroelectric structural transition of potassium lithium tantalite niobate has been studied by both Raman scattering and thermal measurements. A condensed soft lattice vibrational mode at the phase transition has been analyzed. It originates from the symmetric O2/O3–Nb/Ta–O3/O2 in-plane bending of the Nb/TaO6 group. The soft optical phonon mode concerns the extraordinary transverse optical phonons propagating along the [1 1 0] direction. The thermal expansion experiments show a displacive phase transition and a big thermal contraction in the c direction of the crystal, with an average linear expansion coefficient αc = −4.52 × 10−5 K−1. The phase transition temperature and enthalpy are 358 K and 0.50 J/g, respectively. Curie temperature measured by four methods is within 353 and 360 K.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4701 - 4705
Copyright
Copyright © Materials Research Society 1999

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