کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8152508 | 1524755 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and electron spin resonance spectroscopic studies of MnxZn1âxFe2O4 (xâ¯=â¯0.5, 0.6, 0.7) nanoferrites synthesized by sol-gel auto combustion method
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanoferrites with the chemical equation MnxZn1âxFe2O4 (xâ¯=â¯0.5, 0.6, 0.7) were prepared by sol-gel auto combustion method in order to study their structural, elastic and electron magnetic resonance properties. The Bragg reflections in the X-ray diffractograms matched with the formation of cubic spinel phase along with the secondary phases of α-Fe2O3 and Mn2O3. The uneven variation of lattice parameter was found to be depending on the possible cation redistribution in the spinel structure/or grain sizes. From the histograms of SEM studies, the composition xâ¯=â¯0.6 comparatively has a narrow distribution of grain sizes (5-11â¯Î¼m) than those of compositions xâ¯=â¯0.5 (3.5-8.5â¯Î¼m) and xâ¯=â¯0.7 (2.5-8.5â¯Î¼m). The higher and lower vibrational frequencies in the FTIR spectra occurred around 560â¯cmâ1 and 470â¯cmâ1 confirm the cubic spinel phase of present ferrite systems in the line of XRD confirmation. The change in the vibrational frequencies supports the variation of lattice parameter. The variation of lattice energy is supportive for the elastic properties, but not to the structural parameters. The same value of Poisson's ratio (â¼0.35) for the three compositions is an indicative, representing the isotropic behaviour of spinel ferrite systems. The range (2.012-2.106) of Lande's g-parameter indicates the change in Fe3+-O-Fe3+ superexchange interaction. The results are interpreted based on the possible cation redistribution, the secondary phases presuming the core-shell interactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 466, 15 November 2018, Pages 60-68
Journal: Journal of Magnetism and Magnetic Materials - Volume 466, 15 November 2018, Pages 60-68
نویسندگان
M. Deepty, Ch. Srinivas, K. Vijaya Babu, E. Ranjith Kumar, Sher Singh Meena, C.L. Prajapat, N. Krisha Mohan, D.L. Sastry,