Preparation and wide-frequency dielectric properties of (Ba0.5Sr0.4Ca0.1)TiO3/poly(vinylidene fluoride) composites.

Poly(vinylidene fluoride) (PVDF) and (Ba0.5Sr0.4Ca0.1)TiO3 (BSCT) are used as matrix and fillers, respectively, to prepare polymer functional composites by solution casting with N,N-dimethyl formamide as a solvent. It is found that the addition of BSCT has significant influence on the crystallization, melting, and glass transition behaviors of the PVDF matrix. The dielectric properties of the BSCT/PVDF composites are studied over a wide frequency range from 100 Hz to 1 GHz and a wide temperature range from -50°C to 100°C to explore the dependences of frequency and temperature. High dielectric constant (E) up to 132 at 100 Hz and low dielectric loss (tan d) down to 0.0045 at 1 GHz are achieved for the BSCT/PVDF composites. The obtained data of e are also theoretically fit by different models, and the modified Lichtenecker equation and Jayasundere-Smith equation show the best match. © 2014 AIP Publishing LLC. [ABSTRACT FROM AUTHOR]