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Effect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite

TitleEffect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite
Publication TypeJournal Article
Year of Publication2017
AuthorsOrozco, C, Melendez, A, Manadhar, S, Singamaneni, SR, Reddy, KM, Gandha, K, Niebedim, IC, Ramana, CV
JournalJournal of Physical Chemistry C
Date Published11
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberWOS:000416202900061
Keywordscation distribution, chemistry, cofe2o4, dielectric-properties, electrical-properties, ferrite, growth, Materials Science, nanocrystalline, nanoparticles, oxide thin-films, reduction, spinel, Technology - Other Topics

g x(Mo) values. Detailed X-ray photoelectron spectroscopic (XPS) analyses indicate the increasing Mo content with increasing x from 0.0 to 0.3. XPS confirms that the chemistry of Mo is complex in these CFMO compounds; Mo ions exist in the lower oxidation state (Mo4+) for higher x while in a mixed chemical valence state (Mo4+, Mo5+, Mo6+) for lower x values. From the temperature-dependent magnetization, the samples show ferrimagnetic behavior including the pristine CFO. From the isothermal magnetization measurements, we find almost 2-fold decrease in coercive field (H-c) from 2143 to 1145 Oe with the increase in Mo doping up to 30%. This doping-dependent H-c is consistently observed at all the temperatures measured (4, 100, 200, and 300 K). Furthermore, the saturation magnetization estimated at 4 K and at 1.5 T (from M-H loops) goes through a peak at 92 emu/g (at 15% Mo doping) from 81 emu/g (pristine CFO), and starts decreasing to 79 emu/g (at 30% Mo doping). The results demonstrate that the crystal structure, microstructure, and magnetic properties can be tuned by controlling the Mo-content in the CFMO materials.

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