Nanotech 2010

Controlling the size distribution of Fe3O4 by reservoir parameters

F. Karami, A. Yazdani, M. Mirshahi, Z. Shadrokh
tarbiat modares university, IR

Keywords: magnetic materials, nanostructures, chemical synthesis, magnetic properties

Abstract:

The effect of change of pressure and temperature of heat reservoir on the chemical bond, chemical composition, size distribution and the stability of crystal structure of Fe3O4 nanoparticles, synthesized by a chemical co-precipitation method, are investigated by measurements of SEM, X-ray diffraction and magnetization. The effects are considered on the samples which are prepared in aqueous media containing ferrous and ferric salts in two ranges of temperature 25-27°C and 0-2°C at various amounts of urea. The results of SEM and XRD measurements suggest that, homogeneity, crystallization of particles and size are functions of the amount of urea in solution where, with increasing in this amount, as increasing the pressure at constant PH, the particle size would increase too. But, the lattice constants have a reversed relation and decrease with increasing in this amount. The superparamagnetic character with a slop to changeable saturations which as well depends on the amount of urea is the behavior of the prepared samples.
 
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