Abstract: Iron nitride nanocrystallines with core/shell structure were synthesized by solvothermal method using FeCl₂·4H₂O as Fe source, NH₄Cl and NaN₃ as mixed nitrogen source. XRD, TEM and HRTEM were adopted to characterize the phase composition morphology, and core/shell structure of the final product, respectively. The mechanism of the formation of Fe₄N nanocrystallines with core/shell structure were discussed based on the XRD analysis. The effects of temperature, reaction time and feeding order in the experiment and the magnetic property were studied. The results indicate that Fe₄N nanocrystallines with core/shell structure can be prepared in xylene at 400℃ through the precise control of the feeding order. Because of core/shell structure of the product, the maximum value of the specific saturation magnetization of the iron nitride nanocrystal is lower than the value reported by reference.

Key words: iron nitride nanocrystal, solvothermal synthesis, core/shell structure