کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8157129 | 1524859 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of grain boundaries in the conduction of Eu-Ni substituted Y-type hexaferrites
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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
Single phase nanostructured (Eu-Ni) substituted Y-type hexaferrites with nominal composition of Sr2Co2âxNixEuyFe12âyO22 (x=0.0-1, y=0.0-0.1) were synthesized by the microemulsion method. Temperature dependent DC electrical conductivity and drift mobility were found in good agreement with each other, reflecting semiconducting behavior. The presence of Debye peaks in imaginary electric modulus curves confirmed the existence of relaxation phenomena in given frequency range. The AC conductivity follows power law, with exponent (n) value, ranges from 0.81-0.97, indicating that the mechanism is due to polaron hopping. In the present ferrite system, Cole-Cole plots were used to separate the grain and grain boundary effects. Eu-Ni substitution leads to a remarkable rise of grain boundary resistance as compared to the grain resistance. As both AC conductivity and Cole-Cole plots are the functions of concentration, they reveal the dominant contribution of grain boundaries in the conduction mechanism. It was also observed that the AC activation energy is lower than the DC activation energy. Appreciable improved values of quality factor suggested the possible use of these synthesized materials for power applications and high frequency multilayer chip inductors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 362, August 2014, Pages 115-121
Journal: Journal of Magnetism and Magnetic Materials - Volume 362, August 2014, Pages 115-121
نویسندگان
Irshad Ali, M.U. Islam, Muhammad Naeem Ashiq, M. Asif Iqbal, Hasan M. Khan, G. Murtaza,