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Advances in Materials Research
  Volume 1, Number 4, December 2012, pages 285-292

Concentration dependent dielectric properties of Barium Titanate/Polyvenylidene Fluoride (PVDF) and (Bi0.5Na0.5)0.94Ba0.06TiO3/Poly(VDF-TrFE) composite
Ansu K. Roy, Z. Ahmad, A. Prasad and K. Prasad

    The present study addresses the problem of quantitative prediction of effective complex relative permittivity of Barium Titanate/Polyvenylidene Fluoride (PVDF) and (Bi0.5Na0.5)0.94Ba0.06TiO3/ Poly(VDF-TrFE) biphasic ceramic-polymer composites. Theoretical results for effective relative permittivity derived from several dielectric mixture equations were fitted to the experimental data taken from the works of Prasad et al. (2010), Wang et al. (2004), Takenaka et al. (1991) and Yamada et al. (1982). The study revealed that out of the different test equations, only a few equations like modified Rother-Lichtenecker equation, Dias-Dasgupta equation or Rao equation for the real part and Bruggeman equation for the imaginary part of complex permittivity well fitted the corresponding experimental results. In the present study, some of the equations were used in their original forms, while some others were modified by choosing suitable shape-dependent parameters in order to get reasonably good agreement with experimental results. Besides, the experimental results have been proposed in the form of a mathematical model using first order exponential growth, which provided excellent fits.
Key Words
    ceramic-polymer composite; permittivity; dielectric loss; model fitting
Ansu K. Roy, Z. Ahmad and A. Prasad: University Department of Physics, T. M. Bhagalpur University, Bhagalpur - 812 007, India; K. Prasad: Centre for Applied Physics, Central University of Jharkhand, Brambe, Ranchi 835 205, India

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