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Title: Abnormal phase transitions for tetragonal (1-x)Pb(Mg[sub ⅓]Nb[sub ⅔])O₃-xPbTiO₃ single crystals at low temperature
Authors: Wan, Xinming
Zheng, R. K.
Chan, Helen L. W.
Choy, Chung-loong
Zhao, Xiangyong
Luo, Haosu
Subjects: Lead compounds
Relaxor ferroelectrics
Ferroelectric transitions
Crystal structure
Acoustic wave velocity
Issue Date: 1-Dec-2004
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Dec. 2004, v. 96, no. 11, p.6574-6577
Abstract: Dielectric spectroscopy and ultrasonic sound velocity were investigated for tetragonal PMN-xPT single crystals over a wide range of temperature. In addition to the expected phase transition from the tetragonal ferroelectric phase to the cubic paraelectric phase at a high temperature, an abnormal ferroelectric phase transition below room temperature is observed. The low-temperature phase transition shows a relaxor behavior though tetragonal PMN-xPT single crystal is considered to be typical normal ferroelectrics. By comparing the dielectric constants of poled and depoled conditions and by analyzing [BO[sub 6]] oxygen-octahedra units of perovskite structure, it is suggested that the low-temperature phase transition in poled tetragonal PMN-xPT single crystal could be tetragonal to rhombohedral ferroelectric phase transition.
Rights: © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in X. Wan et al. J. Appl. Phys. 96, 6574 (2004) and may be found at
Type: Journal/Magazine Article
ISSN: 0021-8979
Appears in Collections:AP Journal/Magazine Articles

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