Gas phase synthesis of Ni3Fe nanoparticles by magnesium reduction of metal chlorides

► Ni3Fe nanoparticles prepared by reduction of their chlorides with Mg in gas phase. ► XRD and WDS results conformed to thermodynamic modeling of the process. ► Mean size of the particles synthesized at 1020 °C and 1.4 l/min flow rate was 66 nm. ► Increasing argon flow rate from 0.6 to 1.4 l/min decreased the mean particle size. ► Increasing reaction temperature significantly lowered the particle size.