Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 131, Issue 3, Pages 698-705Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.10.037
Keywords
Composite materials; Dielectric properties; Magnetic properties; Nucleation
Categories
Funding
- FEDER funds through the Programa Operacional Factores de Competitividade - COMPETE
- FCT - Fundacao para a Ciencia e a Tecnologia [NANO/NMed-SD/0156/2007, PTDC/CTM/69316/2006, SFRH/BD/45265/2008]
- Basque Government Industry Department [ETORTEK-IE10-272]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/45265/2008] Funding Source: FCT
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Particulate composite films of poly(vinylidene fluoride) and CoFe2O4 and NiFe2O4 were prepared by solvent casting and melt processing. The well-dispersed ferrite nanoparticles nucleate the piezoelectric beta-phase of the polymer, but the different ferrites nucleate the whole polymer crystalline phase at different filler concentrations. The macroscopic magnetic and dielectric response of the composites demonstrates a strong dependence on the volume fraction of ferrite nanoparticles, with both magnetization and dielectric constant increasing for increasing filler content. The beta-relaxation in the composite samples is similar to the one observed for beta-PVDF obtained by stretching. A superparamagnetic behavior was observed for NiFe2O4/PVDF composites, whereas CoFe2O4/PVDF samples developed a hysteresis cycle with coercivity of 0.3T. (C) 2011 Elsevier B.V. All rights reserved.
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