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dc.contributor.authorMahmoud, Mohamed H.
dc.contributor.authorElshahawy, A. M.
dc.contributor.authorMakhlouf, Salah A.
dc.contributor.authorHamdeh, Hussein H.
dc.identifier.citationMahmoud, Mohamed H.; Elshahawy, A. M.; Makhlouf, Salah A.; Hamdeh, Hussein H. 2014. Synthesis of highly ordered 30 nm NiFe2O4 particles by the microwave-combustion method. Journal of Magnetism and Magnetic Materials, vol. 369, November 2014:pp. 55–61en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractNiFe2O4 of 30 nm average size was synthesized by microwave combustion and subsequent solid state reaction at 1273 K. The materials were characterized by X-ray diffraction, TEM, vibrating sample magnetometery and Mossbauer spectroscopy. The microwave combustion produced materials were comprised chemically of ferrites and a smaller amount of hematite. The NiFe2O4 particles have the cubic spinet structure with crystallites of sizes less than 10 nm, and were found to have low magnetization, and essentially no hysteresis loop; characteristics of superparamagnetism. Upon annealing at temperatures 973 K and below, crystallite growth was accompanied by increase in both coercive held and magnetization. The coercive held was a maximum for the sample annealed at 973 K. On the other hand, crystallite growth at higher annealing temperatures yielded mainly ferrites and improvement in soft magnetic properties. Mtissbauer and magnetization measurements indicate that the fine NiFe2O4 particles produced at the annealing temperature of 1273 K are in good chemical and magnetic order, excluding the spins arrangement at the surface of the particles which show spin glass-like behavior. (C) 2014 Elsevier B.V. All rights reserveden_US
dc.publisherElsevier B.V.en_US
dc.relation.ispartofseriesJournal of Magnetism and Magnetic Materials;v.369
dc.subjectCombustion methoden_US
dc.subjectNickel ferriteen_US
dc.subjectMagnetic propertyen_US
dc.subjectMossbauer spectroscopyen_US
dc.titleSynthesis of highly ordered 30 nm NiFe2O4 particles by the microwave-combustion methoden_US
dc.rights.holder(C) 2014 Elsevier B.V. All rights reserved

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