Characterization of Nanostructured Spinel NiFe_2O_4 Obtained by Soft Mechanochemical Synthesis

摘要

Powdery nickel ferrite, NiFe_2O_4 has been obtained by soft mechanochemical synthesis in a planetary ball mill. Ni(OH)_2 and Fe(OH)j are used as initial compounds. This mixture was mechanically activated for 25h, uniaxial pressed and sintered at 1100 °C for 2h. The phase composition of the sintered sample was analyzed by X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and Raman spectroscopy. Morphologies were examined by scanning electron microscopy (SEM). The electrical DC/resistivity/conductivity at different temperatures was measured using a Source Meter Keithley 2410. An Impedance/Gain-Phase Analyzer (HP-4194) was used to measure the impedance spectra (100Hz - 10MHz) at different temperatures.