INVESTIGATION OF MAGNETIC PROPERTIES OF STRONTIUM HEXAGONAL FERRITE NANOPARTICLES

Abstract

Strontium hexaferrite with the formula SrFe₁₂O₁₉ was obtained due to citrate method. A feature of the synthesis is a relatively low production temperature – 700 °С. The X-ray diffraction study revealed the single-phase state of the obtained material due to the complete correspondence of the positions of the diffraction maxima on the experimental XRD pattern with the positions on the reference XRD pattern of strontium hexaferrite from the ICDD data base. An image of the sample obtained with a SEM method at a magnification of 50000 indicates the nanodispersed state of strontium hexaferrite particles. The method of DSC revealed the Curie point located at 450.9 °С. An analysis of the hysteresis loops obtained at 300 and 50 K indicates the obtained magnetically hard material in a single-domain state and the growth of magnetic parameters in conditions of low temperatures, which slows down upon cooling to 100 K. The studies were carried out using a Rigaku Ultima IV diffractometer with CuK_α 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 with a speed of 10 °С/min in air atmosphere, Quantum Design PPMS VersaLab vibrating magnetometer at a temperature of 300 and 50 K with an applied magnetic field of up to 3 T.