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Open AccessArticle

Hydrothermally Synthesized Mg-Based Spinel Nanoferrites: Phase Formation and Study on Magnetic Features and Microwave Characteristics

1
Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan
2
Department of Chemical and Materials Engineering, Chinese Culture University, Taipei 11114, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2274; https://doi.org/10.3390/ma11112274
Received: 13 October 2018 / Revised: 4 November 2018 / Accepted: 12 November 2018 / Published: 14 November 2018
(This article belongs to the Special Issue Advanced Functional Nanomaterials and Their Applications)
Three kinds of magnesium-based spinel nanoferrites with the chemical formulas of MgFe2O4 (Mg ferrite), Mg0.9Mn0.1Fe2O4 (Mg-Mn ferrite), and Mg0.9Mn0.1In0.1Fe1.9O4 (Mg-Mn-In ferrite) were synthesized by hydrothermal route. We report the composition-dependent magnetic parameters and microwave properties of Mg-based ferrite nanoparticles. XRD results revealed that the Mg-based ferrite nanoparticles exhibited a cubic spinel structure and had an average nanocrystallite size in the range of 5.8–2.6 nm. Raman spectroscopy analysis confirmed the formation of cubic-spinel phase Mg-based nanoferrites. The room-temperature magnetization measurements indicated that the Mg ferrite nanoparticles had superparamagnetic behavior; whereas the Mg-Mn and Mg-Mn-In ferrite nanoparticles exhibited a paramagnetic nature. The microwave properties of obtained ferrite nanoparticles were studied by alternating current (AC) magnetic susceptibility measurement and electron paramagnetic resonance (EPR) spectroscopy. It was found that the un-substituted Mg ferrite sample exhibited microwave characteristics better than those of the Mn substituted and Mn-In co-substituted Mg ferrite samples. View Full-Text
Keywords: magnesium ferrite; nanoparticles; hydrothermal synthesis; magnetic properties; superparamagnetism; microwave properties magnesium ferrite; nanoparticles; hydrothermal synthesis; magnetic properties; superparamagnetism; microwave properties
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MDPI and ACS Style

Tsay, C.-Y.; Chiu, Y.-C.; Lei, C.-M. Hydrothermally Synthesized Mg-Based Spinel Nanoferrites: Phase Formation and Study on Magnetic Features and Microwave Characteristics. Materials 2018, 11, 2274.

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