Influence of Sn-Mg co-substitution on the microstructural and magnetic characteristics of M-type SrCaLa hexagonal ferrites

摘要

Sn-Mg co-substituted M-type SrCaLa hexaferrites Sr0.5Ca0.2La0.3Fe12.0-2x(SnMg)(x)O-19 (0.0 = x = 0.5) have been synthesized by ball milling and calcining. The results of X-ray diffraction show that a single magnetoplumbite phase is exhibited in all the samples and no impurity phase is observed in the structure. Lattice constants (c and a) increase with increasing Sn-Mg content (x) from 0.0 to 0.5. Platelet like structure exhibited by FE-SEM micrographs confirms the hexagonal structure of the synthesized samples. The saturation magnetization (M-s) first increases with increasing SnMg content (x) from 0.0 to 0.1, and then decreases when Sn-Mg content (x) = 0.1. The remanent magnetization (M-r), M-r/M-s ratio, coercivity (H-c), magnetic anisotropy field (H-a) and first anisotropy constant (K-1) decrease with increasing Sn-Mg content (x) from 0.0 to 0.5. (C) 2017 Elsevier B.V. All rights reserved.