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Ac conductivity studies on the Li irradiated PZT and SBT ferroelectric thin films

Angadi, Basavaraj and Victor, P and Jali, VM and Lagare, MT and Kumar, Ravi and Krupanidhi, SB (2003) Ac conductivity studies on the Li irradiated PZT and SBT ferroelectric thin films. In: Materials Science and Engineering B, 100 (1). pp. 93-101.

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$Pb(Zr_{0}_{.53}Ti_{0}_{.47})O_{3 }$(PZT) and $SrBi_{2}Ta_{2}O_{9 }$(SBT) ferroelectric thin films were prepared on Pt coated Si substrates by pulsed laser ablation technique and their responses to the high energy Lithium ion irradiation were studied in terms of their ac conductivity, dielectric studies, polarization hysteresis and structural properties. The PZT and SBT thin films were fabricated in Metal/ Insulator-Metal capacitor configuration and were irradiated with the 50 MeV Lithium ions with varying fluence from $1*10^{12}$ to $1-10^{14} $ions$ cm^-^2. $The ferroelectric properties were observed to be degraded by the irradiation. The ac conductivity of the films was explained by the charge carrier hopping model. Irradiated PZT thin films exhibited a significant variation on the frequency dependent exponent(s) while the irradiated SBT thin films had a negligible influence. The activation energy calculated from the Arrhenius plots was found to increase from 1.05 to 1.55 eV for PZT and from 0.85 to 0.91 eV for SBT thin film after irradiation. These energies were attributed to the oxygen vacancies and the deep trap carriers induced by the irradiation.

Item Type: Journal Article
Publication: Materials Science and Engineering B
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science
Keywords: Ferroelectric thin films; Ac conductivity; Irradiation
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Dec 2008 09:17
Last Modified: 08 Jul 2011 11:16
URI: http://eprints.iisc.ac.in/id/eprint/16440

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