Influence of La–Mn substitutions on magnetic properties of M-type strontium hexaferrites

Abstract

M-type strontium hexaferrites of Sr1−xLaxFe12−xMnxO19 (0.0≤x≤0.4) were synthesized by the chemical coprecipitation method. X-ray diffraction (XRD) studies indicate that the samples are single-phase with the space group of P63/mmc. The results of field-emission scanning electronic microscopy (FE-SEM) show that the grains are regular hexagonal platelets with sizes from 0.7 to 1.4 μm. It is observed that the value of Hc increases at low substitution (x ≤ 0.1), reaches a maximum at x = 0.1 and then decreases at x ≥ 0.1, while the value of Ms decreases monotonously with increasing x. The variations of magnetic properties can be tentatively attributed to the effects of La–Mn substitutions. The results above indicate that our samples might be promising candidates for permanent magnets in the future.

Effect of Substitution on the Dielectric and Magnetic Properties of BaFe12O19

“…Among other magnetic properties, some attempts have also been made to improve the maximum energy product, (BH)max for Sr hexaferrites and Ba-hexaferrites using La-Sm [90][91]. Researchers have different manufacturing methods to produce hexaferrites such as traditional ceramic methods [92][93][94][95][96] or several chemical methods [97][98][99][100][101][102][103]. To the best of our knowledge, there are no recent studies which have reported the simultaneous effect of the sintering temperature and La 3+ -Y 3+ dopants on the properties of barium hexaferrites.…”