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AC and DC conductivity studies in pulsed laser ablated $(Ba,Sr)TiO_3$ thin films

Saha, S and Krupanidhi, SB (2001) AC and DC conductivity studies in pulsed laser ablated $(Ba,Sr)TiO_3$ thin films. In: Twelfth International Symposium on Integrated Ferroelectrics, 12-15 March 2000, Aachen, Germany, pp. 353-361.

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

Abstract

A comparison of the AC conductivity of laser ablated $(Ba,Sr)TiO_3$ thin films was made for films grown at different substrate temperatures. The AC conductivity was studied as a function of frequency and ambient temperature ranging from room temperature to 460°C. Conductivity results from AC and DC measurements were compared and their respective Arrhenius plots revealed interesting coincidences. The value of the activation energies computed from the Arrhenius plot of $\sigma_{AC}$ with 1000/T ranged from 0.97 to 1.3 eV in the high temperature region to 0.36 to 0.54 eV in the low temperature region for different samples. The activation energies obtained from pure DC measurement for fields greater than 100 kV/cm across the samples were in the range of 1.06 to 1.32 eV for different samples. The similarity in results suggests a common origin in the DC conduction process in the concerned temperature range and was attributed to ionic conduction resulting from oxygen vacancy motion which has been observed to be significant at high temperatures and high fields. For high temperature grown samples the value of activation energy computed from the Arrhenius plots was comparatively less than those grown at lower substrate temperatures. The difference was attributed to the microstructure and the effect of grain boundaries on the motion of oxygen vacancies leading to the conduction process

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Gordon & Breach
Keywords: barium compounds;dielectric thin films;electrical;conductivity;grain boundaries;ionic conductivity;pulsed laser deposition;strontium compounds;vacancies (crystal)
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 13 Aug 2007
Last Modified: 01 Jul 2011 06:42
URI: http://eprints.iisc.ernet.in/id/eprint/10510

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