Evolution of structural and magnetic properties of nickel oxide nanoparticles: Influence of annealing ambient and temperature

Jafari, Atefeh and Pilban Jahromi, Siamak and Boustani, Komail and Goh, Boon Tong and Huang, Nay Ming (2019) Evolution of structural and magnetic properties of nickel oxide nanoparticles: Influence of annealing ambient and temperature. Journal of Magnetism and Magnetic Materials, 469. pp. 383-390. ISSN 0304-8853

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Official URL: https://doi.org/10.1016/j.jmmm.2018.08.005

Abstract

Nickel oxide (NiO) nanoparticles (NPs) are synthesized using the sol-gel method. The effect of annealing atmosphere type, including air, O2 and annealing temperature (TA) on the structural, morphological and magnetic properties of NiO NPs was investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) analysis. For this purpose, NiO NPs are annealed at 400, 500, 600, 700 and 800 °C. The magnetic properties of the NPs change as a result of increasing crystallite size in terms of TA in both atmospheres. These variations are different according to the type of the annealing atmosphere. At lower temperatures (TA < 600 °C), the NPs that annealed in the O2 atmosphere have higher crystallinity, larger lattice constant, and lower magnetization and coercivity. At higher temperatures, the structural and magnetic properties of the samples in both atmospheres are more similar.

Item Type: Article
Uncontrolled Keywords: NiO nanoparticle; Annealing; Air; O2; Magnetic properties
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 18 Jan 2019 02:19
Last Modified: 18 Jan 2019 02:19
URI: http://eprints.um.edu.my/id/eprint/20064

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