کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8154894 | 1524802 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of 60Co gamma irradiation on dielectric and complex impedance properties of Dy3+ substituted Ni-Zn nanoferrites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanocrystalline Ni1âxZnxFe2âyDyyO4 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0; y=0.0 and 0.1) ferrites were synthesized by combustion method. Ni-Zn-Dy nanoferrites were investigated by X-ray diffraction, scanning electron microscopy, dielectric and impedance properties, before and after γ-irradiation process by 60Co γ-radiation with a dose rate of 310 kGy. The lattice parameter of irradiated samples increased attributed to the conversion of smaller size Fe3+ ions to larger size Fe2+ ions on ionizing effect of gamma radiation. Experimental results reveal that reduction in dielectric constant (εâ²), loss tangent (tan  δ), real (Zâ²) and imaginary (Zâ²â²) impedance and increase in ac conductivity (Ïac) have been increased with increasing in frequency. It was found that εâ², tan  δ, Ïac increase, Zâ²â² and Zâ²â² reach a maximum value and thereafter decrease with further Zn ion substitution. The values of εâ², tan δ and Ïac decrease with Dy3+ substitution and enhanced after irradiation. The complex impedance analysis suggesting predominant contribution to conduction was through the grain boundary.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 375-385
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 375-385
نویسندگان
M. Veena, A. Somashekarappa, G.J. Shankaramurthy, H.S. Jayanna, H.M. Somashekarappa,