کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1611716 | 1516298 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and magnetic properties of SrFe12âxâyAlxCoyO19 nanocomposites prepared via autocombustion technique
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
SrFe12âxâyAlxCoyO19 (x = 1.0-4.0, and y = 0.0-2.0) polycrystalline samples were prepared via autocombustion method and analyzed with respect to their structural and magnetic characteristics. The possibility of simultaneous substitution of Fe3+ by Al3+ and Co2+ was verified for low substitution degrees and it was established that single-phase Al3+-Co2+ substituted hexaferrites can only be obtained up to a maximum substitution of y < 1. A secondary soft magnetic phase CoFe2O4 segregated at higher degree of Co2+ substation (y ⩾ 1). The room temperature (300 K) magnetic parameters derived from hysteresis loops show enhancement in saturation magnetization and concomitant reduction in coercivity values of SrFe12âxâyAlxCoyO19 with the increase in cobalt content. The preferential site occupancy of substituted Co2+ and Al3+ ions resulted in a rapid decline in anisotropy field. Smooth hysteresis curves and increased Mr values with the Co2+ content indicate presence of exchange coupling between magnetic-hard and soft phases of the SrFe12âxâyAlxCoyO19 composite. A reduction in Curie temperature of the composite was observed with Co2+ substitution due to decrease in the strength and number of superexchange interactions between Fe3+ sites. As coercivity, remanence and saturation magnetization values could be controlled with the adequate ratio of Al3+ and Co2+ ions, the SrFe12âxâyAlxCoyO19 compound offers rich choice of using it as hard or soft-magnetic material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 595, 15 May 2014, Pages 213-220
Journal: Journal of Alloys and Compounds - Volume 595, 15 May 2014, Pages 213-220
نویسندگان
J.N. Dahal, L. Wang, S.R. Mishra, V.V. Nguyen, J.P. Liu,