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Dielectric Studies of Laser Ablated Ca Doped $BaTiO_3$ Thin Films

Victor, P and Ranjith, R and Sarkar, A and Vinayak, R and Saha, S and Krupanidhi, SB (2003) Dielectric Studies of Laser Ablated Ca Doped $BaTiO_3$ Thin Films. In: MRS Proceedings, 2-5 Dec. 2002, Boston, MA, USA, pp. 135-140.

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Abstract

Recently, there has been growing interest in Ca modified $BaTiO_3$ structures due to their larger electro-optic coefficients for their use in optical storage of information over conventional $BaTiO_3$ crystals. Barium Calcium Titanate (BCT) shows promising applications in advanced laser systems, optical interconnects and optical storage devices. $BaTiO_3$ thin films of varied Ca (3 at.%-15 at.%) doping were deposited using pulsed laser ablation (KrF excimer laser) technique over Pt/Si substrates. The stoichiometric and the compositional analysis were carried out using EDAX and SIMS. The dielectric studies were done at the frequency regime of 40 Hz to 100 kHz at different ambient temperatures from 200 K to 600 K. The BCT thin films exhibited diffuse phase transition, which was of a typical non lead relaxor behavior and had high dielectric constant and low dielectric loss. The phase transition for the different compositions of BCT thin films was near the room temperature, showing a marked departure from the bulk phase transition. The C-V and the hysteresis behavior confirmed the ferroelectric nature below the phase transition and paraelectric at the room temperature

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Material Research Society.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 11 Jul 2007
Last Modified: 09 Jan 2012 07:48
URI: http://eprints.iisc.ernet.in/id/eprint/10651

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