Effect of heating temperature on structural, magnetic, and dielectric properties of Magnesium ferrites prepared in the p
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Effect of heating temperature on structural, magnetic, and dielectric properties of Magnesium ferrites prepared in the presence of Solanum Lycopersicum fruit extract Hina N. Chaudhari1, Preksha N. Dhruv1, Charanjeet Singh2,*, Sher Singh Meena3,*, Shrikanti Kavita4, and Rajshree B. Jotania1,* 1
Department of Physics, Electronics and Space Science, University School of Sciences, Gujarat University, Ahmedabad 380 009, India 2 School of Electronics and Electrical Engineering, Lovely Professional University, Jalandhar, Punjab 144 411, India 3 Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India 4 International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), IIT Chennai Research Park, Chennai 600113, India
Received: 22 May 2020
ABSTRACT
Accepted: 31 August 2020
MgFe2O4 ferrite was synthesized in the presence of Solanum Lycopersicum fruit extract using sol–gel auto-combustion technique and heated from 650 °C to 1050 °C with the difference of 100 °C. The effect of heating temperature on phase purity, crystal structure, and magnetic as well as dielectric properties was systematically investigated. XRD analysis show that all samples consist of a single phase cubic spinel structure. The average crystallite size of heated samples varied from 10 to 26 nm, it was observed that crystallite size increases with the calcination temperature and average grain size was found in between 18 and 65 nm. SEM micrographs show that there is a drastic reduction in the grain size in the sample prepared in presence of tomato extract (65 nm) compared to the sample prepared without tomato extract (373 nm) and heated at 1050 °C for 4 h. All samples belong to soft ferrite (HC * 10 to 70 Oe) and possess a multidomain structure. As heating temperature increases the values of both saturation magnetization (MS) and hyperfine magnetic field (Hhf) are found to increase. The frequency-dependent dielectric phenomenon was observed in all prepared samples and single one-fourth semi-circles observed in Nyquist plot because of the contribution of the grain boundaries over the grain conductions. M00 and Z00 vs frequency plots reveal the absence of Debye relaxation in prepared compositions.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04389-1
J Mater Sci: Mater Electron
1 Introduction Ferrites are ferrimagnetic ceramics that comprise iron oxide as the main element [1]. Ferrites have huge technological importance due to their good magnetic and electrical properties [2, 3]. Spinel ferrites are used in various gadgets like high-frequency transformer cores, phase shifter, switches, resonators, mobile phones, computers, and televisions [4, 5]. Nanoparticles of spinel ferrites are used for gas sensor and hyperthermia applications [6–8]. Ferrites with spinel structure can be represented by MFe2O4 (where, M = Ni2?, Co2?, Cu2?, etc.). The cubic spinel f
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