Dielectric response and complex impedance spectroscopy studies in pulsed laser ablated $(Ba,Sr)TiO_3$ thin films

Saha, S and Krupanidhi, SB (2001) Dielectric response and complex impedance spectroscopy studies in pulsed laser ablated $(Ba,Sr)TiO_3$ thin films. In: Integrated Ferroelectrics, 33 (1-4). pp. 331-342.

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Abstract

The dielectric response of pulsed laser ablated barium strontium titanate $(Ba,Sr)TiO_3$ thin films was studied as a function of frequency, time and ambient temperature. Both time and frequency responses followed the `universal power law' pertaining to the universal dielectric response model theorized by Jonscher (1983). Theoretical fits were used to compare the experimental results and determine the temperature dependence of the theoretical parameters such as n(T) and a(T) used in the universal model. Complex impedance spectroscopy was used to investigate the grain, grain boundary, and electrode/film interface responses. The complex spectroscopic plots revealed the major response originated from the bulk grains while in the ease of polycrystalline samples the grain boundary contributed significantly. The Arrhenius plot of the bulk resistance calculated from complex impedance diagrams showed a significant difference in the activation energy ranging from 1.17 to 1.23 eV for samples grown at different substrate temperatures

Item Type:	Journal Article
Publication:	Integrated Ferroelectrics
Publisher:	Gordon & Breach
Additional Information:	Copyright of this article belongs to Taylor and Francis
Keywords:	barium compounds;crystal microstructure;dielectric thin films;electric impedance;grain boundaries;ionic conductivity;permittivity;pulsed laser deposition;strontium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	14 Aug 2007
Last Modified:	22 Jun 2012 09:51
URI:	http://eprints.iisc.ac.in/id/eprint/10509

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