Abstract
Pr-Bi co-doped M-type Ba-Sr hexaferrites with nominal compositions Ba0.35Sr0.65-xPrxFe12.0-xBixO19 (0.00x0.40) were synthesized for the first time by the solid-state reaction method. These hexaferrites were characterized by X-ray diffractometer (XRD), Fourier transformer infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), vibrating sample magnetometer (VSM) and thermogravimetric analyzer (TGA). XRD patterns showed that the single M-type hexaferrite phase was obtained only if Pr-Bi content (x)0.24. FT-IR frequency bands in the range (608-610) cm(-1) and (445-447) cm(-1) correspond to the formation of tetrahedral and octahedral clusters of metal oxides in the hexaferrites, respectively. FE-SEM micrographs indicated that the grains were of platelet-like shapes. The saturation magnetization (M-s), remanent magnetization (M-r), magnetic anisotropy field (H-a), first anisotropy constant (K-1) and coercivity (H-c) first increased with Pr-Bi content (x) from 0.00 to 0.08, and then decreased when Pr-Bi content (x)0.08. The Curie temperature (T-c) decreased with increasing Pr-Bi content (x) from 0.00 to 0.40.