# Effect of AC&DC Field on the Dielectric Response of $(Pb,La)TiO_3$ Thin Films

Venkateswarlu, P and Laha, Apurba and Victor, P and Rajareddy, M and Krupanidhi, SB (2003) Effect of AC&DC Field on the Dielectric Response of $(Pb,La)TiO_3$ Thin Films. In: Integrated Ferroelectrics, 54 . 665 -677.

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## Abstract

Lanthanum doped lead titanate thin films are the potential candidates for the capacitors, actuators and pyroelectric sensor applications due to their excellent dielectric, and ferroelectric properties. Lanthanum doped lead titanate thin films are grown on platinum coated Si substrates by excimer laser ablation technique. A broad diffused phase transition with the maximum dielectric permittivity $(\varepsilon_{max})$ shifting to higher temperatures with the increase of frequency, along with frequency dispersion below $T_c$, which are the signatures of the relaxor like characteristics were observed. The dielectric properties are investigated from m60°C to 200°C with an application of different dc fields. With increasing dc field, the dielectric constant is observed to reduce and phase transition temperature shifted to higher temperature. With the increased ac signal amplitude of the applied frequency, the magnitude of the dielectric constant is increasing and the frequency dispersion is observed in ferroelectric phase, whereas in paraelectric phase, there is no dispersion has been observed. The results are correlated with the existing theories.

Item Type: Journal Article The Copyright belongs to Taylor & Francis. Division of Chemical Sciences > Materials Research Centre Nagaraj Vaidya 12 Apr 2006 27 Aug 2008 11:52 http://eprints.iisc.ac.in/id/eprint/6246