Investigating the Magnetic Properties of Strontium Hexagonal Ferrite Nanoparticles

Strontium hexaferrite with the formula SrFe₁₂O₁₉ is prepared using citrate technology. A feature of this synthesis is a relatively low production temperature of 700°C. X-ray diffraction study reveals the single-phase state of the resulting material, due to the full correspondence of the positions of the diffraction maxima on the experimental XRD pattern and the positions on the reference XRD pattern of strontium hexaferrite from the ICDD database. A SEM image of the sample at a magnification of 50 000 testifies to the nanodispersed state of strontium hexaferrite particles. DSC reveals a Curie point of 450.9°C. Analysis of the hysteresis loops at 300 and 50 K indicates a magnetically hard material in a single-domain state and the growth of magnetic parameters at low temperatures, which slows upon cooling to 100 K. Studies are performed on a Rigaku Ultima IV diffractometer with CuKα radiation and a scanning speed of 2°/min, a JEOL JSM-7001F electron microscope with an EDS Oxford INCA X-max 80 energy-dispersive spectrometer, a Netzsch STA449C F1 Jupiter thermal analyzer upon heating to 600°C at a rate of 10°С/min in air, and a Quantum Design PPMS VersaLab vibrating magnetometer at temperatures of 300 and 50 K with an applied magnetic field of up to 3 T.