Analysis of crystal structure and magnetic character strontium ferrite (SrFe12O19) powder made of stoichiometry and non-stoichiometry compositions

Abstract

A hard magnetic strontium hexaferrite was successfully synthesized from SrCl2 and FeCl3 with varying composition of SrCl2 and FeCl3 in stoichiometric ratio (1:6) and non- stoichiometric ratio (1:5.5 and 1:6.5). The synthesis process was carried out by coprecipitation method. The powder then calcined at 950°C and 1050°C, held for 2 hours. Crystal structure was characterized using X-Ray Diffractometer (XRD), showing that the crystal structure is a single phase with stoichiometric ratio at calcination temperature of 950°C. On the other hand, magnetic properties were performed by using Vibrating Sample Magnetometer (VSM). Based on this experiment, it was found some magnetic properties, such as; a magnetic remanent (Br) was 32.47 emu / gram, magnetic coercivity (JHc) was 4.855 kOe.