Analysis of chemically synthesized Nickel Ferrite nanoparticle depending on sintering temperature

This paper reports that the Nickel Ferrite (NiFe₂O₄) nanoparticle has been synthesized by chemical method applying ultrasonic vibration followed by sintering at the temperature range of 200-1400°C. Ultrafine particles has been successfully obtained which was confirmed by X-ray diffraction patterns. In order to study properties like resistivity and permittivity of NiFe₂O₄, samples have been sintered in the temperature range of 800-1400°C for 3 hours. Homogeneous grain distribution has been found from Scanning Electron Microscopy. The DC electrical resistivity of NiFe₂O₄ samples decreases with increase in temperature which is due to grain size and grain boundary as well as electron hopping between Fe³⁺ and Fe²⁺ state. The dependence of dielectric properties on sintering temperature has been presented for the frequency range of 100 kHz to 5 MHz which follows the conventional nature of ferrites, that is, the permittivity has its lowest value at the highest frequency of 5 MHz.