Synthesis and characterization of shape-controlled Ni 0.5Zn 0.5Fe 2O 4 via the coprecipitation method

Abstract

Fe 3+ was used for preparing spherical Ni 0.5Zn 0.5Fe 2O 4 with an average diameter of 40 nm by the coprecipitation method. Fe 2+ and various precipitators (NaOH, Na 2CO 3 and NH 3·H 2O) were used for preparing doped FeOOH with different morphologies and crystal types by the coprecipitation–air oxygenation method. Spindle-like and rod-like size-controlled Ni 0.5Zn 0.5Fe 2O 4 samples were obtained subsequent to the calcinations of the precursor, for Ni 0.5Zn 0.5Fe 2O 4 maintained the morphology of the doped FeOOH. The phase, morphology, and particle diameter of the samples were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the magnetic properties were measured by a vibrating sample magnetometer (VSM). It was found that the coercivity of the sample increased with an increase in the effective anisotropy. Also, the comprehensive magnetic properties of the samples obtained via Fe 2+ and the NaOH precipitator were optimum, and the coercivity, saturation magnetization, and remanent magnetization for the Ni 0.5Zn 0.5Fe 2O 4 sample were obtained as 90.5 Oe, 54.3 emu/g, and 5.1 emu/g, respectively.