Abstract
Nickel ferrite (NiF2O4) was synthesized by the micelles mixing method,
using lyophilized coconut oil. The method leads to the formation of
ferrite nanoparticles. Nickel ferrite was prepared in coconut oil
suspension and annealed during 4 h, at 400, 600, 800, 1000, and 1200 C.
The X-ray diffraction (XRD) was applied to investigate the nanoparticle
size dependence on the annealing temperature. Complex permittivity
measurements were carried out in cavity resonators at 5.0 and 9.0 GHz,
using the small perturbation theory. The main result is that the real
part of the permittivity decreases with increasing annealing
temperatures (3.6-2.4), while the imaginary part of the permittivity
varies only for the lowest annealing temperatures, remaining low for the
other samples (about 10(-3)). The X-ray diffractograms indicates that
the nanoparticle size increase with annealing temperature, allowed the
correlation between the nanoparticle size and the observed microwave
dielectric response. (c) 2007 Wiley Periodicals, Inc.
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