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TitleDielectric and magnetic properties of ferrite/poly(vinylidene fluoride) nanocomposites
Author(s)Martins, P.
Costa, Carlos M.
Botelho, Gabriela
Lanceros-Méndez, S.
Barandiaran, J. M.
Gutierrez, J.
KeywordsPolymer composites
Dielectric properties
Magnetic properties
Composite materials
Issue date2012
JournalMaterials Chemistry and Physics
Abstract(s)Particulate composite films of poly(vinylidene fluoride) and CoFe2O4 and NiFe2O4 ferrites were prepared from solvent casting and melt processing. The well dispersed ferrite nanoparticles nucleate the piezoelectric -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 β-relaxation in the composite samples is similar to the one observed for -PVDF obtained by stretching. A superparamagnetic behavior was observed for NiFe2O4/PVDF composites, whereas CoFe2O4/PVDF samples develop a hysteresis cycle with coercivity of 0.3 T.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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