کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128951 | 1645163 | 2019 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and magnetic properties of Sr0.8La0.2Co0.2Fe11.8âxAlxO19 hexaferrite particles prepared via sol-gel auto-combustion method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural and magnetic properties of Sr0.8La0.2Co0.2Fe11.8âxAlxO19 hexaferrite particles prepared via sol-gel auto-combustion method Structural and magnetic properties of Sr0.8La0.2Co0.2Fe11.8âxAlxO19 hexaferrite particles prepared via sol-gel auto-combustion method](/preview/png/10128951.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 469, 1 January 2019, Pages 189-195
Journal: Journal of Magnetism and Magnetic Materials - Volume 469, 1 January 2019, Pages 189-195
نویسندگان
Yibo Du, Ying Liu, Lixian Lian, Jiao Du,