Abstract
Electromagnetic core shell nanocomposites (1 − x) ZnTiO3/(x) CoFe2O4 were prepared successfully through sol–gel procedures, where (x ~ 0, 5, 10 and 15 wt%). The end product powders were identified through XRD, SEM, and TEM. The XRD results prove the presence of ZnTiO3 and CoFe2O4, while the SEM graph confirms the core–shell nanostructure. The dielectric properties such as dielectric constant (ε′), loss tangent tan(δ), dielectric modulus M′ and M″, and ac conductivity (σ) are measured in the frequency range 0.1–107 Hz. The dielectric properties show a dependence behavior on the variation of CoFe2O4 content in the core–shell composite. CoFe2O4@ZnTiO3 nanocomposites manifest striking enhancement on dielectric properties compared to ZnTiO3. The dielectric permittivity (ɛ′) increases from 204 to 415 at low frequency with increasing the CFO content from zero to 15 wt%. The Loss tangent tan (δ) of the electromagnetic nanocomposite has a very tiny value of 3.8 × 10−3 in the high-frequency range proving a very high-quality factor (Q = ν × 1/tan (δ) ~ 2 × 109 at 107 Hz. Mʺ shows a peak that differentiates between the long-range hop** and the localized motion of the charge carriers. The conductivity of the electromagnetic composite is released from hop** charge carriers over the whole frequency range compared to CoFe2O4. The improvement of the micro capacitor due to the interfacial polarization enhances the dielectric characterization of CoFe2O4@ZnTiO3. The electromagnetic samples show a presence of magnetic order, in which the saturation magnetization of the electromagnetic samples increases from 0.113 to 9.35 emu/g with increasing CoFe2O4 concentration from 5 to 15 wt%.
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Acknowledgements
The authors are thankful to the support of the Science and Technology Development Fund (STDF)—Egypt—for financial supporting of the researches concerning to the project; ID 25776.
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Abou Hammad, A.B., Darwish, A.G. & El Nahrawy, A.M. Identification of dielectric and magnetic properties of core shell ZnTiO3/CoFe2O4 nanocomposites. Appl. Phys. A 126, 504 (2020). https://doi.org/10.1007/s00339-020-03679-z
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DOI: https://doi.org/10.1007/s00339-020-03679-z