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Dielectric Studies of laser ablated Ca doped BaTiO3 thin films.

Published online by Cambridge University Press:  11 February 2011

P. Victor ,
R. Ranjith, Asis Sarkar ,
R. Vinayak ,
S. Saha  and
S. B. Krupanidhi
P. Victor
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore, India
R. Ranjith, Asis Sarkar
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore, India
R. Vinayak
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore, India
S. Saha
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore, India
S. B. Krupanidhi
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore, India
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Abstract

Recently, there has been growing interest in Ca modified BaTiO3 structures due to their larger electro-optic coefficients for their use in optical storage of information over conventional BaTiO3 crystals. Barium Calcium Titanate (BCT) shows promising applications in advanced laser systems, optical interconnects and optical storage devices. BaTiO3 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 748: Symposium U – Ferroelectric Thin Films XI , 2002 , U12.15
Copyright
Copyright © Materials Research Society 2003

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References

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