Abstract
M-type hexagonal SrCoxFe12−xO19 (x = 0, 0.1, 0.2, and 0.3) have been synthesized by the ball-milling assisted ceramic process. The influence of Co substitutions on the crystalline structure, lattice strain, morphology, and magnetic behaviors has been investigated. The results show that a high-crystallized hexagonal SrCoxFe12−xO19 is obtained when the precursor is calcined at 950 °C in air for 3 h. Lattice parameters and grain size of SrCoxFe12−xO19 increase with the increase in substitution content (x). Hysteresis behavior varies with substitution content (x) and calcination temperature. M-type hexagonal SrCoxFe12−xO19 (x = 0, 0.1, and 0.2), calcined at 950 °C, with uniaxial anisotropy exhibits a broad M–H loop and rectangular shape. At higher calcination temperature (1050 and 1200 °C) or substitution content (x) is equal to 0.3, the character of the hysteresis loop of SrCoxFe12−xO19 changes from hard into semi-hard. The trend of specific saturation magnetization of SrCoxFe12−xO19, calcined at 950 °C, increases with the decrease in lattice strains. SrFe12O19, calcined at 950 °C, has the highest specific saturation magnetization value (91.30 emu/g) and magnetic moment (17.36 µ B). With the increase of calcination temperature, magnetic domain type of ferrites changes from a single magnetic domain to a multi-domain type.
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Grant No. 21603040) and the Guangxi Natural Science Foundation of China (Grant Nos. 2016GXNSFDA380034, 2016GXNSFBA380062).
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Wu, X., Chen, W., Wu, W. et al. Synthesis of hexagonal Co3+-substituted Sr-ferrites via ball-milling assisted ceramic process and their magnetic properties. J Mater Sci: Mater Electron 28, 18815–18824 (2017). https://doi.org/10.1007/s10854-017-7831-4
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DOI: https://doi.org/10.1007/s10854-017-7831-4