Amighian, J. and Mozaffari, M. and Nasr, B. (2006) Preparation of nano-sized manganese ferrite (MnFe2O4) via coprecipitation method. Physica Status Solidi C - Current Topics in Solid State Physics, 3 (9). pp. 3188-3192. ISSN 1610-1634
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Official URL: http://www3.interscience.wiley.com/journal/1127707...
Nano-sized manganese ferrite (MnFe2O4) powder has been synthesized via coprecipitation method, using FeSO4.7H(2)O and MnSO4.H2O as starting materials. An aqueous solution of the starting materials, containing Fe2+ and Mn2+ in the ratio required in the ferrite, was poured into an NaOH alkaline solution. A greenish precipitate was formed, which carefully washed and dried for 6 h at 80 degrees C. The dried powder was then heated for 2 h at different temperatures in argon atmosphere and then rapidly cooled to room temperature, using water quenching. XRD patterns of the samples show that the sample annealed at 1050 degrees C is single phase. Also using Scherrer's formula a mean crystallite size of 80 nm was obtained. Magnetic measurements were performed on cold pressed pellets, using a sensitive permeameter with a maximum field of 1.2 T. The results show that a single phase MnFe2O4 nano-sized powder can be obtained at annealing temperature of 1050 degrees C, which is lower than 1250 degrees C related to the annealing temperature of the same ferrite, prepared by the conventional ceramic technique. Saturation magnetization of the single-phase sample was 1330 G, which is lower than 5000 G related to a bulk sample. The difference between the values is reasonable, because the magnetic measurements were performed on cold-pressed unsintered nano sized powders. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||04 Nov 2009 07:48|
|Last Modified:||04 Nov 2009 07:48|
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