Low loss high dielectric permittivity of polyvinylidene fluoride and KxTiyNi1-x-yO (x=0.05, y=0.02) composites.

Authors :: Bhadra, Debabrata
Biswas, A.
Sarkar, S.
Chaudhuri, B. K.
Tseng, K. F.
Yang, H. D.
Source :: Journal of Applied Physics; Jul2010, Vol. 107 Issue 12, p124115, 7p, 3 Diagrams, 1 Chart, 5 Graphs
Publication Year :: 2010
Abstract: Homogeneous thick film (∼0.10 mm) of high dielectric K<subscript>0.05</subscript>Ti<subscript>0.02</subscript>Ni<subscript>0.93</subscript>O; abbreviated as KTNO/polyvinylidene fluoride (PVDF) composite has been prepared by hot-molding technique. The frequency and temperature dependent dielectric behavior of this composite has been studied by varying the KTNO volume fraction (f<subscript>KTNO</subscript>). Near the percolation threshold (f<subscript>KTNO</subscript>=0.40), a large enhancement of effective dielectric permittivity ([variant_greek_epsilon]<subscript>eff</subscript>∼400 which is 40 times higher than that of pure PVDF) with low loss (∼0.20 at 1 kHz) is observed. The experimental [variant_greek_epsilon]<subscript>eff</subscript> data have been fitted with different theoretical models and found to follow percolation theory successfully. Such a high [variant_greek_epsilon]<subscript>eff</subscript> and low loss flexible dielectric material appears to be suitable for technological applications. [ABSTRACT FROM AUTHOR]

Subjects :: THICK films
DIELECTRIC devices
FLUORIDES
COMPOSITE materials
PERCOLATION

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