Title :
Synthesis and Magnetic Properties of Sr0.65−xCaxLa0.35Fe11.32Co0.28O18.435 Hexaferrites Prepared by Solid-State Reaction Method
Author :
Yujie Yang ; Xiansong Liu
Author_Institution :
Eng. Technol. Res. Center of Magn. Mater., Anhui Univ., Hefei, China
Abstract :
M-type hexaferrite Sr0.65-xCaxLa0.35Fe11.32Co0.28O18.435 (0 ≤ x ≤ 0.45) magnetic powder and magnets were prepared according to the solid-state reaction method. The phase compositions of the calcined powder samples were characterized by X-ray diffraction. There is a single magnetoplumbite phase in the calcined magnetic powder with the increase of x from 0 to 0.45. The micrographs of the sintered magnets were observed by a field emission scanning electron microscopy. The sintered magnets have formed the perfect hexagonal structure and the particles are distributed evenly. The influence of calcium content on magnetic properties of the magnets was studied systematically. The magnetic properties [including Br, Hcj, Hcb and (BH)max] of the magnets first increase with x from 0 to 0.20, and then, begin to decrease when x continues to increase. The magnetic properties of the magnet at x = 0.20 reach the maximum values.
Keywords :
X-ray diffraction; calcination; calcium compounds; coercive force; ferrites; field emission electron microscopy; lanthanum compounds; magnetic particles; powders; remanence; scanning electron microscopy; sintering; strontium compounds; FESEM; M-type hexaferrite; Sr0.65-xCaxLa0.35Fe11.32Co0.28O18.435; X-ray diffraction; XRD; calcined magnetic powder; calcium content; field emission scanning electron microscopy; magnetic properties; magnetoplumbite phase; perfect hexagonal structure; phase compositions; sintered magnet micrographs; solid-state reaction method; Calcium; Ferrites; Magnetic hysteresis; Magnetic properties; Perpendicular magnetic anisotropy; Saturation magnetization; Calcium content; X-ray diffraction (XRD); hexagonal ferrites; magnetic properties;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2320221