Abstract
AbstractThe relaxor ferroelectrics showing diffuse phase transition (DPT) are promising materials for multilayer ceramic capacitors because of their high dielectric permittivity in the vicinity of the so called DPT. This physical parameter is also important in the fine piezoelectric, pyroelectric and electro optic performance of relaxor ferroelectrics. The dielectric behavior of these materials shows that the ferroelectric–paraelectric transition is diffuse. Also, there is a frequency dispersion of the real and imaginary parts of the dielectric permittivity and a deviation from the Curie–Weiss law. Many models have been developed to explain this phenomenon, but the exact mechanism associated to this dielectric behavior has not been established yet. This paper presents an analysis of the dielectric behavior in PLZT ferroelectric ceramics by using a new multi‐Debye relaxation model, which does not make assumptions that involve the microstructure or possible correlation mechanisms. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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