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NiFe 2 O 4 nanoparticles were synthesized via solid-state reaction. The effects of the reaction parameters, namely dispersant content, calcination temperature and annealing time on particle size and morphology were investigated. Magnetic properties of NiFe 2 O 4 nanoparticles were tested. The formation mechanism of nanoparticles by solid-state reaction was also discussed. The results indicated that the synthesized nickel ferrite particles were of nanometer size with different morphologies by slight variation of the reaction conditions. The solid-state reaction technique is a simple, convenient, inexpensive and effective preparation method of NiFe 2 O 4 in high yield.*