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No Access Submitted: 24 February 2014 Accepted: 05 April 2014 Published Online: 17 April 2014

  • Polarization switching characteristics of 0.5BaTi0.8Zr0.2O3-0.5Ba0.7Ca0.3TiO3 lead free ferroelectric thin films by pulsed laser deposition

Journal of Applied Physics 115, 154102 (2014); https://doi.org/10.1063/1.4871673
Y. D. Kolekar1,2,3, A. Bhaumik1, P. A. Shaikh4, C. V. Ramana3, and K. Ghosh1, a)
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  • Y. D. Kolekar
  • A. Bhaumik
  • P. A. Shaikh
  • C. V. Ramana
  • K. Ghosh
ABSTRACT
We report on the ferroelectricity for morphotropic-phase-boundary lead (Pb) free 0.5BaTi0.8Zr0.2O3-0.5Ba0.7Ca0.3TiO3 (0.5BZT-0.5BCT) thin films. Thin films were grown on Pt/Ti/SiO2/Si substrate using pulsed laser deposition. Raman spectroscopic data combined with the X-ray diffraction analyses confirm body centered tetragonal crystallographic structure 0.5BZT-0.5 BCT thin films on Pt/Ti/SiO2/Si. Polarization studies demonstrate that these 0.5BZT-0.5BCT films exhibit a large remnant and saturation polarization of 37 μC/cm2 and 40 μC/cm2, respectively, with a coercive field of 140 kV/cm. A correlation between polarization dynamics, structural distortion, and phonon vibration is established. The splitting of X-ray diffraction peak of the thin film in the 2θ range of 44.5° to 46.5° represents high degree of tetragonality. The tetragonality factor calculated by Rietveld analysis was found to be 0.006 and can be a major cause for the increased remnant polarization value. It is established from Raman spectra that the non-centrosymmetricity due to the displacement of Ti/Zr ions from its octahedral position is related to the peak position as well as the broadening of the A1 (LO) optical phonon mode. This increase of broadness in the thin film causes an increase in the dipole moment of the unit cell and, hence, the net increase in polarization values.

ACKNOWLEDGMENTS

Y. D. Kolekar, one of the authors, acknowledges the Department of Science and Technology, New Delhi, India, for providing financial support through the BOYSCAST fellowship to visit Missouri State University. C.V.R acknowledges with pleasure the support from National Science Foundation (NSF), NSF-PREM Grant No. DMR-1205302. Y.D.K. at UTEP was supported by the AMLIF. We thank Rishi Patel for proof reading this article carefully.

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