http://www.cnr.it/ontology/cnr/individuo/prodotto/ID281951

Structural, Magnetic, and Optical Characterization of MnFe2O4 Nanoparticles Synthesized Via Sol-Gel Method (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Structural, Magnetic, and Optical Characterization of MnFe2O4 Nanoparticles Synthesized Via Sol-Gel Method (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1109/TMAG.2013.2262039 (literal)

Alternative label

Rivas, Patricia; Sagredo, Vicente; Rossi, Francesca; Pernechele, Chiara; Solzi, Massimo; Pena, Octavio (2013)
Structural, Magnetic, and Optical Characterization of MnFe2O4 Nanoparticles Synthesized Via Sol-Gel Method
in IEEE transactions on magnetics; IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE,, PISCATAWAY, NJ 08855-4141 (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Rivas, Patricia; Sagredo, Vicente; Rossi, Francesca; Pernechele, Chiara; Solzi, Massimo; Pena, Octavio (literal)

Pagina inizio

4568 (literal)

Pagina fine

4571 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

10th Latin American Workshop on Magnetism, Magnetic Materials and their Applications (LAW3M) Location: Univ Buenos Aires, Facultad Derecho, Buenos Aires, ARGENTINA Date: APR 08-12, 2013 Sponsor(s):IEEE Magnet Soc (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6566072&queryText%3D10.1109%2FTMAG.2013.2262039 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

49 (literal)

Rivista

IEEE transactions on magnetics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

4 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

8 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1 Univ Los Andes, Fac Ciencias, Dept Fis, Lab Magnetismo, Merida 5101, Venezuela; 2 IMEM CNR Inst, I-43010 Parma, Italy; 3 Univ Parma, Dipartamento Fis, I-43100 Parma, Italy; 4 Univ Parma, CNISM, I-43100 Parma, Italy; 5 Univ Rennes 1, Sci Chim Rennes UMR 6226, F-35014 Rennes, France (literal)

Titolo

Structural, Magnetic, and Optical Characterization of MnFe2O4 Nanoparticles Synthesized Via Sol-Gel Method (literal)

Abstract

Nanoparticles of MnFe2O4 were synthesized via sol-gel method, with calcination processes at 400 degrees C and 500 degrees 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 Neel 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 degrees 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. (literal)

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