Аннотация:The M-type hexaferrites crystal lattice attracts interest as the prospectibe matrix for substitution to vary the object’s properties. This article presents the investigation results of aluminum-substituted barium hexaferrite BaFe8Al4O19. It was obtained that cation substitution proceeds layer by layer, meaning that aluminum ions located at 12k positions form a nonmagnetic layer. That separates the magnetic sublattices and enables the reorientation of magnetic moments upon heating, forming a new magnetic sublattice without changing the phase composition. The aluminum cations distribution in the crystal lattice was confirmed by quantum chemical calculations, neutron diffraction, and Mössbauer spectroscopy. The presence of two magnetic transitions at different temperatures was confirmed by temperature magnetometry and temperature neutron diffraction.
