Preparation of Strontium Ferrite by Hydrothermal-Chemical Co-Precipitation and its Morphological Properties

Abstract

M-type SrFe12O19 (SrM) ferrite was prepared via the hydrothermal and chemical co-precipitation route using ‘needle-like’ FeOOH as the iron source. The effects of different heating rates and calcination temperatures on the physical phase, structure, and magnetic properties of SrM ferrite were investigated using x-ray diffractometer (XRD), scanning electron microscope (SEM), and vibrating sample magnetometer (VSM) techniques. The results show that heating rates have a significant effect on the phase composition, microstructure, and magnetic properties of ferrite. As the pure SrM ferrite was synthesized, a lamellar hexagonal structure formed alongside lower heating rates. Calcination temperature also has a significant effect on the phase composition, microstructure, and magnetic properties of ferrite. Pure SrM ferrite was synthesized at calcination temperatures of higher than 1100 ℃. The particle size of ferrite gradually increased alongside higher calcination temperatures. The as-made SrM ferrite exhibited a Ms of 55.09 emu/g, a Mr of 31.93 emu/g, a Hc of 5538 Oe at a calcination temperature of 1100 ℃, and a heating rate of 1 ℃/min (900 ℃ – 1100 ℃).

Keywords: Strontium ferrite, Hydrothermal method, Chemical co-precipitation, Characterization, Analysis