Nanosized powders of NiZn ferrite: Synthesis, structure, and magnetism

摘要: The structure and magnetic behavior of nanostructured powders stoichiometric NiZn ferrite, Ni0.5Zn0.5Fe2O4, synthesized by coprecipitation, are investigated extended x-ray-absorption fine spectroscopy (EXAFS), x-ray diffraction, Mossbauer spectroscopy, vibrating sample magnetometry. Samples high purity homogeneity were obtained annealing at relatively low temperatures (300–800 °C) resulting in nanoparticles with average diameter between 9 90 nm, as determined diffraction. EXAFS was applied to follow Ni, Zn, Fe cations distribution the evolution short range order samples increasing temperature. Our results show ferrimagnetic ferrite nanosized purity, 1:1 Ni Zn ratio superparamagnetic behavior. Moreover, exhibit good structural ordering already after heat treatment 400 °C. Analysis magnetometry indicated a critical particle for tran...