Siberian Federal University

In this paper, alkaline precipitation of iron and nickel ions has been used to obtain ferrimagnetic NiFe2O4 nanoparticles of homogeneous size and morphology, with low values of coercivity and remanent magnetization. Using the fractional factorial design (FFD 27–4) the optimal synthesis parameters were determined: C(Ni(NO3)2) = 0,4 M, C(Fe(NO3)3) = 0,8 M, C(NaOH) = 1 M, n(CTAB)/n(Ni2++ Fe3+) = 1/60, pH = 10, temperature 25 °C, duration 5 min, volume of 0.1 M tartaric acid – 1 ml. The obtained samples were characterized by X‑ray phase analysis, transmission electron microscopy, photon correlation spectroscopy. Optical and magnetic properties of the synthesized nickel ferrite have been studied. It is shown that the magnetic properties of nickel ferrite particles can be tuned by controlling their size through the selection of the reaction parameters. Under optimal conditions, NiFe2O4 nanoparticles with an average size of 18,0 ± 0,8 nm and saturation magnetization 35 emu/g, residual magnetization 6,3 emu/g, coercivity 167 Oe were obtained. The particles are suitable for therapeutic applications