Investigation of Relaxor Behavior in Pb(Mgg1/3Nb2/3)O3-PbTiO3 Thin Films

Krupanidhi, SB and Laha, A (2004) Investigation of Relaxor Behavior in Pb(Mgg1/3Nb2/3)O3-PbTiO3 Thin Films. In: Ferroelectrics, 306 . pp. 17-27.

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Abstract

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:	Journal Article
Publication:	Ferroelectrics
Publisher:	Taylor & Francis Group
Additional Information:	The copyright of this article belongs to Taylor and Francis Group
Keywords:	Dielectric relaxation;relaxor ferroelectrics;lead titanate;lead magnesium niobate;thin films;polarization hysteresis;superparaelectric nanopolar clusters
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	22 Nov 2004
Last Modified:	17 Jan 2012 06:28
URI:	http://eprints.iisc.ac.in/id/eprint/2215

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