BaFe10.5Mn1.5O19 single crystal growth

This paper presents the results of single crystal growth and research of the crystal structure of magnetic properties of manganese substituted barium hexaferrite BaFe12-xMnxO19 single crystals. Single crystals were grown from Na2O using the method of spontaneous crystallization. Crystals of BaFe12-xMnxO19 with x up to 1.5 and sizes up to 8 mm were obtained. The influence of Fe substitution by Mn on magnetic properties was investigated. The grown crystals were tested with SEM/EDX. An X-ray analysis of the samples was performed, and lattice parameters were obtained. For the composition BaFe10,5Mn1,5O19 lattice parameters were equal to a = 5.8946(2) Å, c = 23.1870(6) Å, V = 697.73(3) Å3. The differential scanning calorimeter was used to obtain the temperature of phase transformation. For x = 1.5 the Curie temperature decreased from 455 to 380 °C. For BaFe10,5Mn1,5O19 magnetic properties were measured. For single crystal samples saturation magnetization reduced from 269 to 237.3 kA/m, and the coercive force was 1 Oe at room temperature.