Dielectric response and impedance spectroscopy of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 thin films

Laha, Apurba ; Krupanidhi, S. B. (2003) Dielectric response and impedance spectroscopy of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 thin films Materials Science and Engineering B, 98 (3). pp. 204-212. ISSN 0921-5107

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09215...

Related URL: http://dx.doi.org/10.1016/S0921-5107(03)00033-3


Dielectric response of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) thin films deposited by pulsed laser deposition has been studied as a function of frequency over a wide range of temperatures. The films exhibited maximum frequency dispersion in both real and imaginary part of dielectric susceptibility near and below the dielectric transition temperature. The relaxor behavior in the films was confirmed from the diffused phase transition (DP) together with frequency dependent of transition temperature (Tm). The frequency dependence of transition temperature Tm (temperature of the maximum of dielectric constant) was studied in terms of Vogel-Fulcher relation. The dielectric relaxation of PMN-PT thin films was studied at different temperatures using the complex impedance (Z) and electric modulus (M) formalism. The shape of complex impedance curve inferred that only one type of dielectric relaxation was involved in the present case. This was attributed to the contribution of bulk grain of the films while the other probable sources, such as grain boundaries, film electrode interfaces were negligible. The films exhibited Debye type dielectric relaxation at temperature sufficiently above the temperature of permittivity maximum (Tm), while a multi-Debye relaxation was observed at lower temperatures (<200 ° C), which was confirmed from the broad spectrum of dielectric relaxation. The average relaxation times estimated from Cole-Cole plots varied with temperature according to the V-F relation.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Relaxor Ferroelectrics; Dielectric Response; Diffused Phase Transition; Impedance Spectroscopy
ID Code:19033
Deposited On:25 Nov 2010 14:34
Last Modified:06 Jun 2011 04:42

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