  The possibility of obtaining relatively high dielectric constant
polymer-ceramic composite by incorporating the giant dielectric constant
material, CaCu3Ti4O12 (CCTO) in a Poly(vinylidene fluoride) (PVDF) polymer
matrix by melt mixing and hot pressing process was demonstrated. The structure,
morphology and dielectric properties of the composites were characterized using
X ray diffraction, Thermal analysis, Scanning Electron Microscope, and
Impedance analyzer. The effective dielectric constant of the composite
increased with increase in the volume fraction of CCTO at all the frequencies
(100 Hz to 1MHz) under study. The dielectric loss did not show any variation
upto 40 % loading of CCTO, but showed an increasing trend beyond 40%. The room
temperature dielectric constant as high as 95 at 100Hz has been realized for
the composite with 55 Vol % of CCTO, which has increased to about 190 at 150oC.
Theoretical models like Maxwells Clausius Mossotti, Effective medium theory,
logarithmic law and Yamada were employed to rationalize the dielectric
behaviour of the composite and discussed. Keywords: A. Ceramic; A. Polymer
matrix composite
