Crystallization Kinetics of Strontium Hexaferrite: Correlation to Structural, Morphological, Dielectric and Magnetic Properties

Abstract

Citrate precursor technique has been used to synthesize strontium hexaferrite and reported here. The crystallization process for ferrite phase formation has been investigated by TG/DTG/DTA for three different heating rates in air atmosphere. The thermal process mainly consists of three essential steps; first removal of water residues; second decomposition of organic compound and the third step is crystallization of SrF12O19. The activation energy of reaction is, 157 KJ/mole, evaluated using non-isothermal kinetic model. The precursor and crystallized SrF12O19 samples have been characterized for structural, chemical, morphological, dielectric and magnetic properties using x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), inductance capacitance resistance (LCR) meter bridge and vibrating sample magnetometer (VSM) respectively. The degree of crystallization of SrF12O19 is the key factor for the dilution and enhancement of morphological and magnetic properties. The thermal, morphological and magnetic analysis confirms the formation of single phase of magnetoplumbite strontium ferrite at 1200°C.