Investigation of relaxor behavior in Pb(Mgg1/3Nb2/3)O3-PbTiO3 thin films

Krupanidhi, S. B. ; Laha, A. (2004) Investigation of relaxor behavior in Pb(Mgg1/3Nb2/3)O3-PbTiO3 thin films Ferroelectrics, 306 (1). pp. 17-27. ISSN 0015-0193

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Relaxor properties of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) thin films have been analyzed in terms of large frequency dispersion of dielectric response at temperatures below that of the peak permittivity. A wide spectrum of dielectric relaxation was observed in the frequency dependent response of imaginary part of dielectric permittivity. A cumulative response of Debye relaxators was experimentally observed at lower temperatures. The Cole-Cole plots (ε' vs. ε") showed a broad distribution in dielectric relaxation at lower temperatures. The temperature dependence of dielectric dispersion has been analyzed using Vogel-Fulcher relation. A little modification in the Vogel-Fulcher (V-F) relation was incorporated to avoid the singularity at the V-F temperature (Tf). The activation energy (E) and the freezing temperature in PMN-PT thin films were 40 mV and 400 K, respectively. Investigation of ferroelectric properties in terms of polarization hysteresis behavior confirmed presence of interaction among nanopolar clusters.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Ltd.
Keywords:Dielectric Relaxation; Relaxor Ferroelectrics; Lead Titanate; Lead Magnesium Niobate; Thin Films; Polarization Hysteresis; Superparaelectric Nanopolar Clusters
ID Code:19281
Deposited On:23 Nov 2010 13:12
Last Modified:06 Jun 2011 04:36

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