Influence of La-Co substitution on the structure and magnetic properties of low-temperature sintered M-type barium ferrites

La-Co substituted M-type barium ferrites (BaM) were prepared by traditional solid state method and sintered at low temperature (1173 K). X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) were employed to investigate the influence of La-Co on the structure and magnetic properties of the samples. By sintering at 1173 K for 6 h in air, single phase M-type barium ferrites with chemical composition of Ba(LaCo)xFe12−2xO19 (x=0.0−0.5) were formed. M-H curves showed that the magnetic properties of barium ferrites were obviously effected by La-Co substitution. The saturation magnetization (Ms) and coercivity (Hc) reached the maximum value of 65.15 Am2/kg and 4165 Oe, respectively. This behavior was attributed to the sites of La-Co substitutions and the particles size. SEM revealed that the shape of ferrite particles was influenced by La-Co substitution.

Variation of Ms and Hc with different sintering temperatures in the La-Co substituted samples (a) 1173 K for 6 h; (b) 1173 K for 4 hFigure optionsDownload as PowerPoint slide