Structure,magnetization and Mossbauer study of nanostructured Ni_0.50Zn_0.50Fe_2O_4 ferrite powders

摘要

Nanostructured ferrites possess more advantages than the conventional ferrite materials and have been a research focus recently.In this work,a series of nanostructured Ni_0.5Zn_0.5Fe_2O_4 were synthesized by a citrate reaction method followed by calcining at various temperatures with the goal of obtaining pure phase Ni_0.5Zn_0.5Fe_2O_4 nanoparticle while keeping the size small.X-ray diffraction,transmission electron microscopy,SQUID magnetometry and Mossbuaer spectroscopy (ME) have been employed to characterize the crystal structure,phase homogeneity,particle size,the conditinos for reaction completion,and the magnetic properties.The results show that the saturation magnetization M_s at both 10K and 300K increase with increasing calcination temperature T_ca,but particle size also increases with T_ca.