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Home > Issues > SearchMagnetic and Dielectric Properties of CoFe2O4 and CoxZn1-xFe2O4 Nanoparticles Synthesized Using Sol-Gel Method
Journal of Magnetics, Volume 22, Number 3, 30 Sep 2017, Pages 406-413
Sewench N. Rafeeq (Department of Applied Science, University of Technology), Mukhils M. Ismail * 
(Department of Applied Science, University of Technology), Jameel M. A. Sulaiman (Department of Applied Science, University of Technology)
(Department of Applied Science, University of Technology), Jameel M. A. Sulaiman (Department of Applied Science, University of Technology)
Abstract
Cobalt ferrite nanoparticles (CoFe2O4) and cobalt zinc ferrites with general formula CoxZn1-xFe2O4 (x = 0.5, 0.6, 0.7) were prepared by sol-gel method at a low temperature with a final pH value of 7. Synthesized spinel
ferrites were sintered at various temperatures (220, 400, 600, 800 and 1000oC). X-ray diffraction (XRD) was used to characterize the sizes of particles and structural properties. The average crystalline size of the prepared
ferrite was ranged between 18-49 nm. The FTIR spectra however showed two strong absorption bands ranged between (1037.45-399.26 cm−1), which is a spinel ferrite. The study also focused on several dielectric
properties of the samples such as dielectric constant (ε' ), dielectric loss tangent (tan δ) and complex dielectric constant (ε'' ). The variation of dielectric parameters (ε) and tanδ with frequency revealed that the dispersion
was due to Maxwell-Wagner. Magnetization measurements showed that the coactivity (Hc), saturation magnetization (Ms), remanent magnetization (Mr) and squarenessremnance ratio (R = Mr/Ms) strongly depend on content of zinc.
ferrites were sintered at various temperatures (220, 400, 600, 800 and 1000oC). X-ray diffraction (XRD) was used to characterize the sizes of particles and structural properties. The average crystalline size of the prepared
ferrite was ranged between 18-49 nm. The FTIR spectra however showed two strong absorption bands ranged between (1037.45-399.26 cm−1), which is a spinel ferrite. The study also focused on several dielectric
properties of the samples such as dielectric constant (ε' ), dielectric loss tangent (tan δ) and complex dielectric constant (ε'' ). The variation of dielectric parameters (ε) and tanδ with frequency revealed that the dispersion
was due to Maxwell-Wagner. Magnetization measurements showed that the coactivity (Hc), saturation magnetization (Ms), remanent magnetization (Mr) and squarenessremnance ratio (R = Mr/Ms) strongly depend on content of zinc.
Keywords: Sol-gel synthesis; Co-Zn ferrites; dielectric; magnetic properties
DOI: https://doi.org/10.4283/JMAG.2017.22.3.406
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