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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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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0015019...


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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