Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5490994 | Journal of Magnetism and Magnetic Materials | 2017 | 6 Pages |
Abstract
The solution combustion synthesis of porous magnetite (Fe3O4) powders by a mixture of glycine and urea fuels was investigated concerning the thermodynamic aspects and powder characteristics. The adiabatic combustion temperature and combusted species were thermodynamically calculated as a function of the fuel to oxidant molar ratio (Ï). The combustion behavior, phase evolution, porous structure and magnetic properties were characterized by thermal analysis, X-ray diffractometry, N2 adsorption-desorption, electron microscopy and vibrating sample magnetometry techniques. Nearly single phase Fe3O4 powders were synthesized by the mixture of fuels at Ï values of 0.75 and 1. The as-combusted Fe3O4 powders at ÏÂ =Â 1 exhibited porous structure with the specific surface area of 83.4Â m2/g. The highest saturation magnetization of 75.5 emu/g and the lowest coercivity of 84 Oe were achieved at ÏÂ =Â 1, due to the high purity and large crystallite size, inducing from the highest adiabatic combustion temperature.
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Physical Sciences and Engineering
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Condensed Matter Physics
Authors
H. Parnianfar, S.M. Masoudpanah, S. Alamolhoda, H. Fathi,