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Title: Revisit of the Vögel-Fulcher freezing in lead magnesium niobate relaxors
Authors: Ke, Shanming
Fan, Huiqing
Huang, Haitao
Subjects: Dielectric relaxation
Lead compounds
Magnesium compounds
Relaxor ferroelectrics
Issue Date: 27-Sep-2010
Publisher: American Institute of Physics
Source: Applied physics letters, 27 Sept. 2010, v. 97, no. 13, 132905, p. 1-3.
Abstract: The Vögel–Fulcher (VF) equation ω= ω₀ exp[−Eₐ/kв(Tm−Tƒ)] was frequently used to describe the dielectric relaxation of relaxor ferroelectrics where ω is the probe frequency at the peak temperature Tm of either the real or imaginary parts of the dielectric constant. We revisited this relation in a typical relaxor lead magnesium niobate and found that the parameters obtained were not physically meaningful. Meaningful results can only be obtained by fitting the VF relation on the characteristic relaxation time Tc, whose temperature dependence can be obtained from the Cole–Cole model. The freezing temperature we obtained is 230 K, below which Tc becomes temperature independent.
Rights: © 2010 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 S. Ke, H. Fan & H. Huang, Appl. Phys. Lett. 97, 132905 (2010) and may be found at
Type: Journal/Magazine Article
DOI: 10.1063/1.3494531
ISSN: 0003-6951 (print)
1077-3118 (online)
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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