Synthesis of the Nanocrystalline/Nanosized NiFe2O4 Powder by Ceramic Method and Mechanical Milling
The polycrystalline nickel ferrite - NiFe2O4 has been obtained by ceramic route starting from a stoichiometric mixture of oxides (NiO and α-Fe2O3 powders). The obtained NiFe2O4 was subjected to high energy ball milling. The formation of NiFe2O4 by ceramic method and also the evolution of the powder during milling were studied by X-ray diffraction. The mean crystallite size of the NiFe2O4 continuously decreases with the increasing of the milling time and for all the milling time it is in nanometric range. The particles sizes are drastically reduced by milling process. For the milled samples, the particles size is ranging from tens of microns to few nanometers. The powder morphology and local chemical homogeneity were investigated by scanning electron microscopy (SEM) and respectively by energy dispersive x-ray spectrometry (EDX).
Mircea Nicoară, Aurel Răduţă and Carmen Opriş
V. F. Tarța et al., "Synthesis of the Nanocrystalline/Nanosized NiFe2O4 Powder by Ceramic Method and Mechanical Milling", Solid State Phenomena, Vol. 188, pp. 27-30, 2012