کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1802736 1024603 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of Cu2+ concentration on the structure and transport properties of Cr–Zn ferrites
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Role of Cu2+ concentration on the structure and transport properties of Cr–Zn ferrites
چکیده انگلیسی

The influence of Cu concentration on the transport and microstructure characteristics of CuyZn1−yCr0.8Fe1.2O4 with 0.2≤y≤1 ferrite was studied. X-ray, energy dispersive X- ray (EDAX) and infrared spectra (IR) were carried out to assure the formation of the sample in the proper form. The dielectric constant (ε′) and ac conductivity were measured at different frequencies ranging from 600 kHz to 5 MHz from room temperature up to 800 K. The obtained data reveals that, a single phase cubic spinel structure for all the concentrations. From the results of IR spectra, mainly two bands were observed. The dielectric constant and the dielectric loss tangent decrease with increasing frequency and Cu concentration. The dielectric constant shows a dispersion peak (ε′max) which shifts to higher frequency with increasing the temperature. The results are explained as due to the fact that the dielectric polarization process is similar to that of conduction. The appearance of the dispersion peak is related to the contribution of two types of charge carriers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 321, Issue 20, October 2009, Pages 3436–3441
نویسندگان
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