A study on the microstructural and magnetic properties of the Sr0.70-xBaxLa0.30Fe11.78Cu0.22O19 hexagonal ferrites

Abstract

Hexagonal ferrite Sr 0.70-x Ba x La 0.30 Fe 11.78 Cu 0.22 O 19 (0 ≤ x ≤0.7) magnetic powders and magnets were synthesized by the ceramic process. The phase compositions of the magnetic powders were investigated by X-ray diffraction. There is a single magnetoplumbite phase in the magnetic powders with barium content (x) from 0 to 0.70. The micrographs of the magnets were observed by a field emission scanning electron microscopy. All magnets have formed hexagonal structures and the particles are distributed evenly. Magnetic properties of the magnets were measured by a magnetic properties test instrument. The remanence, intrinsic coercivity, magnetic induction coercivity and maximum energy product of the magnets continuously decrease with the increase of barium content (x).