| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 846661 | Optik - International Journal for Light and Electron Optics | 2016 | 7 Pages |
M-type Sr-Ca hexaferrites Sr0.7Ca0.3FexO19 with varying Fe/(Sr + Ca) molar ratios in between 9.8 and 12.0 have been synthesized by utilizing a solid state reaction process. X-ray diffraction (XRD) was used to characterize the phase composition of the magnetic powders. From the XRD data, it is found that the magnetic powders with Fe/(Sr + Ca) molar ratios from 9.8 to 11.8 consists of pure magnetoplumbite without any other impurity phases, while the magnetic powder with Fe/(Sr + Ca) molar ratio of 12.0 shows α-Fe2O3 as a second phase. Morphologies of the sintered magnets were observed by a field emission scanning electron microscopy (FE-SEM). FE-SEM images of the sintered magnets showed the hexagonal platelet-like shape. A magnetic properties test instrument was used to measure the magnetic properties of the sintered magnets. The remanence (Br) and maximum energy product [(BH)max] first increase with Fe/(Sr + Ca) molar ratio from 9.8 to 11.4 and then begin to decrease when Fe/(Sr + Ca) molar ratio ≥ 11.4. While the intrinsic coercivity (Hcj) and magnetic induction coercivity (Hcb) first increase with Fe/(Sr + Ca) molar ratio from 9.8 to 11.0 and then decrease when Fe/(Sr + Ca) molar ratio ≥ 11.0. The Hk/Hcj ratio reaches the minimum value at Fe/(Sr + Ca) molar ratio = 11.0.
