Vibrational properties of BaFe11.1Sc0.9O19 hexaferrite at high and low temperatures

摘要

BaFe11.1Sc0.9O19 hexaferrite compound was synthesized, the crystal structure was studied by the X- ray diffraction method. Powder samples were prepared from the mark "analytical grade" oxides Fe2O3, Sc2O3 and carbonate BaCO3. It was found that under normal conditions and at room temperatures, the crystal structure of this compound has hexagonal symmetry with the P6(3)mmc space group. The lattice parameters correspond to the values: a = 5.8842 angstrom and c = 23.1774 angstrom. Atomic dynamics of BaFe11.1Sc0.9O19 hexaferrite in the range of low temperatures of -190 degrees C <= T <= 20 degrees C and high temperatures of 20 degrees C <= T <= 490 degrees C were studied. As a result of the analysis of the spectra obtained by the Raman spectroscopy method, it was determined that the structural phase transition does not occur in this compound over a wide temperature range -190 degrees C <= T <= 490 degrees C. At the room temperature, the obtained Raman modes are observed at both low and high temperatures.