کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1462523 | 989633 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
AC transport properties of nanocrystalline SnO2 semiconductor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The complex dielectric constant É* has been found to vary with frequency which is attributed to the multi-relaxation time constants of the energy states responsible for conduction mechanism. At any particular frequency, É* has been found to increase with temperature. The frequency dependence of loss tangent tan δ has been explained with the help of the equivalent circuit model. The observed frequency dependence of ac conductivity has been found to obey the power law: Ïac â ÏS, where variation of S with temperature indicates multi-hopping conduction mechanism in nanocrystalline SnO2 samples. The complex impedance plots of Zâ² versus Zâ³ at different temperatures have been found to be single semicircular arcs with a non-zero intersection with the real axis in the high frequency region and have their centres lying below the real axis at a particular angle of depression, indicating multirelaxation processes in the material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 38, Issue 2, March 2012, Pages 1281-1286
Journal: Ceramics International - Volume 38, Issue 2, March 2012, Pages 1281-1286
نویسندگان
P.P. Sahay, R.K. Mishra, S.N. Pandey, S. Jha, M. Shamsuddin,