Size dependence of optical and magnetic properties of nickel oxide nanoparticles fabricated by electric arc discharge method |
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| Affiliation: | 1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;2. Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China;1. Holy Spirit University of Kaslik, USEK, Jounieh, Lebanon;2. CNRS, ICMCB, UPR 9048, F-33600 Pessac, France;3. Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France;4. Ministry of Higher Education, Beirut, Lebanon;1. Laboratoire de Physique Appliquée, Faculté des Sciences, B.P. 1171, 3000 Sfax, Université de Sfax, Tunisie;2. MCBT, Institut Néel, CNRS—25 avenue des Martyrs, bâtiment E, BP 166, 38042 Grenoble cedex 9, France;3. Institut Néel, CNRS—Université J. Fourier, BP 166, 38042 Grenoble, France;1. Departamento de Engenharia Química, Escola de Engenharia de Lorena-EEL/USP, Estrada Municipal do Campinho S/N, CEP 12602-810 Lorena, São Paulo, Brazil;2. Instituto Tecnológico de Aeronáutica-ITA/CTA, Praça Mal. Eduardo Gomes 50, CEP 12228-900 São José dos Campos, São Paulo, Brazil;1. Department of Ceramic Engineering, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005 India;2. Department of Electronics Engineering, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India;3. School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India |
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| Abstract: | Nickel oxide nanoparticles with an average size of between 28 and 62 nm were fabricated by electric arc discharge method. The electric currents of 10, 100, 200, 300 and 400 A and oxygen pressures of 1, 2 and 3 atm. were tested. High yield production was observed for the samples prepared at low arc current. The samples were characterized using XRD and FESEM measurements. XRD results showed that the samples were pure and single phase of nickel oxide with cubic structure. The produced nanoparticles were cubic shaped and the average particle sizes increased by increasing the arc pressure, but decreased by increasing the arc current and their size distributions were uniform. The magnetic measurements confirmed a soft ferromagnetic behavior for the nickel oxide nanoparticles at low field region but the hysteresis loop tended to be antiferromagnetic like for the higher fields. By decreasing the particle size from 62 nm, the coercivity (Hc) increased but decreased when the particle size was less than about 57 nm. Such magnetic behavior which can be common for antiferromagnetic nanoparticles was interpreted based on a core-shell model. |
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| Keywords: | C. Optical properties C. Magnetic properties D. Transition metal oxides Arc discharge |
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