Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/549
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Title: Lorentz-type relationship of the temperature dependent dielectric permittivity in ferroelectrics with diffuse phase transition
Authors: Ke, S
Fan, H
Huang, H 
Chan, HLW 
Issue Date: 18-Sep-2008
Source: Applied physics letters, 18 Sept. 2008, v. 93, 112906, p. 1-3
Abstract: The temperature dependence of the dielectric permittivity of perovskite Ba(Zr[sub x]Ti[sub 1−x])O₃ solid solutions, PbMg[sub ⅓]Nb[sub ⅔]O₃ relaxor, and BaTiO₃ferroelectric ceramics was measured. It is found that a Lorentz-type law can be used to describe the dielectric permittivity of either the normal ferroelectrics with or without diffuse phase transitions (DPT) or the typical ferroelectric relaxors. The ferroelectric DPT can be well described by just one fitting process using the Lorentz-type law, while the relaxor ferroelectric transition needs two independent fitting processes. The Lorentz-type law fails at the low temperature side of the dielectric maximum of a first-order ferroelectric phase transition. Above the transition temperature, the dielectric curves of all the studied materials can be well described by a Lorentz-type law.
Keywords: Ferroelectric transitions
Lorenz number
Permittivity
Phase transformations
Relaxor ferroelectrics
Solid solutions
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
Rights: © 2008 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 et al., Appl. Phys. Lett. 93, 112906 (2008) and may be found athttp://link.aip.org/link/?apl/93/112906
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