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|Title:||Dielectric and magnetic properties of ferrite/poly(vinylidene fluoride) nanocomposites|
Costa, Carlos M.
Barandiaran, J. M.
|Journal:||Materials 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.|
|Access:||Restricted access (UMinho)|
|Appears in Collections:||CDF - FCD - Artigos/Papers (with refereeing)|
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