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Metals 2016, 6(8), 181;

Structure and Physical Properties of NiO/Co3O4 Nanoparticles

Department of Physics, Faculty of Science, Malayer University, Malayer 65719-95863, Iran
Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA
Department of Physics, Universiti Putra Malaysia, Serdang 43400, Malaysia
Department of Chemistry, Azad University, Shahre-Ghods Branch, Tehran 37541-374, Iran
Institute of Micro Engineering and Nano Electronics (IMEN), Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
Department of Physics, Farhangian University, Shiraz 71456-15515, Iran
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 24 March 2016 / Revised: 8 June 2016 / Accepted: 28 June 2016 / Published: 5 August 2016
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The thermal treatment method was employed to prepare nickel-cobalt oxide (NiO/Co3O4) nanoparticles. This method was attempted to achieve the higher homogeneity of the final product. Specimens of nickel-cobalt oxide were characterized by various experimental techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). X-ray diffraction results showed that there was no crystallinity in the predecessor, and it still had the amorphous phase. The formations of the crystalline phases of the nickel-cobalt oxide nanoparticles started from 350–500 °C, and the final products had different crystallite sizes ranging from 11–35 nm. Furthermore, the variation of DC conductivity (σdc), impedance, tangent loss (tgδ) and dielectric constant (ε′) of the calcined specimens with frequency in the range of 102–106 Hz was investigated. σdc showed a value of 1.9 × 10−6 S/m, 1.3 × 10−6 S/m and 1.6 × 10−6 S/m for the specimens calcined at 350, 400 and 450 °C, respectively. Additionally, a decrease in tgδ values with an increase in temperature was observed. Finally, the formed nanoparticles exhibited ferromagnetic behaviors, which were confirmed by using a vibrating sample magnetometer (VSM). View Full-Text
Keywords: nickel-cobalt oxide nanoparticles; conductivity; dielectric constant; magnetic properties nickel-cobalt oxide nanoparticles; conductivity; dielectric constant; magnetic properties

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Naseri, M.; Dehzangi, A.; Kamari, H.M.; See, A.; Abedi, M.; Salasi, R.; Goli-Kand, A.N.; Dianat, P.; Larki, F.; Abedini, A.; Hassan, J.; Far, A.K.; Majlis, B.Y. Structure and Physical Properties of NiO/Co3O4 Nanoparticles. Metals 2016, 6, 181.

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