کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1623813 | 1516413 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
AC conductivity studies in rare earth ions doped vanadotellurite glasses
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The frequency and temperature dependence of ac electrical conductivity in the temperature range 300-525Â K and frequency range 50Â Hz to 5Â MHz has been investigated in La2O and CeO2 doped vanadotellurite glasses. The electrical conduction has been observed to be due to small polaron hopping at high temperatures. Frequency dependence of ac conductivity has been explained using correlated barrier hopping (CBH) model. The conductivity, at all studied frequencies and temperatures, decreased and activation energy increased with increase in rare earth ion concentration in both La2O and CeO2 doped vanadotellurite glasses, which has been attributed to the hindrance to the electronic motion offered by rare earth ions. The dielectric constant and dielectric loss increased with increase in temperature and decreased with increase in frequency and rare earth ions content. It is for the first time that the La2O and CeO2 doped vanadotellurite glasses have been investigated for ac conductivity and dielectric properties over a wide range of frequency and temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 464, Issues 1â2, 22 September 2008, Pages 393-398
Journal: Journal of Alloys and Compounds - Volume 464, Issues 1â2, 22 September 2008, Pages 393-398
نویسندگان
M. Prashant Kumar, T. Sankarappa, Santhosh Kumar,