Abstract
Nanocrystalline powder of the single phase nickel‐zinc ferrite have been prepared by a sol‐gel auto‐combustion process. The nitrate‐citrate gels were prepared from metal nitrates and citric acid solutions with various molar ratios of the metal nitrates to citric acid. The results showed that the nitrate citrate gels exhibit a self‐propagating behavior after ignition in air. The thermal decomposition of nitrate‐citrate gels and the phase evolution of the as‐burnt powder were investigated by differential thermal analysis and thermogravimetry (DTA/TG) and X‐ray diffraction (XRD) techniques respectively. Transmission electron microscope (TEM) was used to characterize the microstructure of the material. Magnetic properties were also measured by a vibrating sample magnetometer (VSM) with a maximum applied field of 10 kOe. The results also revealed that the molar ratio of the metal nitrates to citric acid has important effects on the formation temperature and the crystallite size which affect the magnetic properties of the nickel‐zinc ferrite.
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