Correlation between Iron Substitution Degree in the M-Type Hexaferrites Based Crystal Structures and Dopant Content in the Crystal Growth Feeding Melt

In this paper the results of the investigation of the properties of the obtained crystals of hexaferrites grown from the sodium carbonate flux doped with 1 – 12 mass % of metal oxide (aluminum, titanium, manganese, cobalt, and copper) are presentd. The ratio of concentration of doping elements in the crystal and in the feeding melt has strong dependence on nature of dopant. Doping metals can be ordered in a line Ti > Al > Mn > Co > Cu where Ti has maximal ratio of 0.5 and Cu of 0.005. Hexagonal M type ferrites attract the reseachers interest due to great capacity for the accommodation of different metals at high doping levels that provides a possibility for wide tuning of physical properties by cation substitution.