Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10128951 | Journal of Magnetism and Magnetic Materials | 2019 | 32 Pages |
Abstract
M-type hexaferrite particles with chemical composition of Sr0.8La0.2Co0.2Fe11.8âxAlxO19 (xâ¯=â¯0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were prepared using sol-gel auto-combustion technique followed by a heat treatment. X-ray diffraction patterns showed the presence of single hexaferrite phase with no detection of other phases for all samples. The atomic ratios obtained from energy dispersive X-ray spectroscopy were close to the initial stoichiometric ratios. The observation of the particles achieved using a field emission scanning electron microscope depicted a transition from multi-domain particles to single domain particles due to Al substitution. The room temperature Mössbauer spectral analysis demonstrated that Al3+ ions preferred 12k and 2a sites. DSC analysis showed that the Curie temperature (TC) increased firstly to a maximum value of 707â¯K at xâ¯=â¯0.2, and then decreased with further increasing Al content. The room temperature MS and Mr values decreased linearly with Al substitution while HC increased rapidly to a maximum value of 9390.2 Oe at xâ¯=â¯1.0, which was â¼47% increase in coercivity as compared to that of Sr0.8La0.2Co0.2Fe11.8O19. The magnetic results indicated that a small amount of Al substitution in La-Co co-substituted Sr-ferrites can obviously improve coercivity with relatively high saturation magnetization.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Yibo Du, Ying Liu, Lixian Lian, Jiao Du,