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Alternating current conduction and impedance spectroscopy analysis on pulsed excimer laser ablated (Pb, La)TiO3 thin films

Venkateswarlu, P and Victor, P and Krupanidhi, SB (2002) Alternating current conduction and impedance spectroscopy analysis on pulsed excimer laser ablated (Pb, La)TiO3 thin films. In: Integrated Ferroelectrics, 46 . pp. 143-152.

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/1058458...

Abstract

Lanthanum doped lead titanate (PLT) thin films were identified as the most potential candidates for the pyroelectric and memory applications. PLT thin films were deposited on Pt coated Si by excimer laser ablation technique. The polarization behavior of PLT thin films has been studied over a temperature range of 300 K to 550 K. A universal power law relation was brought into picture to explain the frequency dependence of ac conductivity. At higher frequency region ac conductivity of PLT thin films become temperature independent. The temperature dependence of ac conductivity and the relaxation time is analyzed in detail. The activation energy obtained from the ac conductivity was attributed to the shallow trap controlled space charge conduction in the bulk of the sample. The impedance analysis for PLT thin films were also performed to get insight of the microscopic parameters, like grain, grain boundary, and film-electrode interface etc. The imaginary component of impedance Z" exhibited different peak maxima at different temperatures. Different types of mechanisms were analyzed in detail to explain the dielectric relaxation behavior in the PLT thin films.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Keywords: Laser Ablation;dielectric Properties;dielectric Relaxation;impedance
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 04 Aug 2011 06:03
Last Modified: 04 Aug 2011 06:03
URI: http://eprints.iisc.ernet.in/id/eprint/38947

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