NDLI: Structural, Magnetic, and Optical Characterization of <formula formulatype=inline><tex Notation=TeX>${rm MnFe}_{2}{rm O}_{4}$</tex></formula> Nanoparticles Synthesized Via Sol-Gel Method

Content Provider	IEEE Xplore Digital Library
Author	Rivas, P. Sagredo, V. Rossi, F. Pernechele, C. Solzi, M. Pena, O.
Copyright Year	1965
Abstract	Nanoparticles of MnFe₂O₄ were synthesized via sol-gel method, with calcination processes at 400 ^°C and 500 ^°C in air. The effects of the different calcinations in the formation of the crystal structure and magnetic and optical properties were studied with X-ray diffraction (XRD), electron microscopy, SQUID magnetometer, and optical absorption. The XRD studies reveal the formation of a phase corresponding to cubic spinel structure in both samples and the presence of a second phase identified as Fe₂O₃, in the case of the sample with higher temperature treatment. The TEM images of the first sample show small nonuniform nanoparticles with a mean size of 7.8 nm, with a strong tendency to form agglomerates. Magnetization studies as a function of temperature were carried following field-cooled (FC)-Zero-field-cooled (ZFC) routines, where the ZFC curves exhibit blocking temperatures close to 250 K in both cases, and the behavior of the samples below this temperature suggests strong interaction between the particles. In the magnetization as a function of magnetic field studies, the curves display a tendency to saturate at low temperatures and the system shows superparamagnetic behavior above the blocking temperature. Saturation magnetization values (at low temperatures) are low compared to the expected ones, according to the Néel model of collinear spins, this can be attributed to canting effects or the presence of a second antiferromagnetic phase, specifically in the sample treated at 500 ^°C. No significant differences were observed in the magnetic behavior of the samples. Semiconducting characteristics of the ferrites were confirmed by optical absorption measurements, obtaining an energy gap value close to 2.23 eV at room temperature.
Sponsorship	IEEE Magnetics Society
Starting Page	4568
Ending Page	4571
Page Count	4
File Size	760468
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ferrites Saturation magnetization Nanoparticles Magnetic properties Manganese Temperature Temperature measurement optical properties Heat treatment magnetic properties Mn ferrite
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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