کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1530724 995811 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixed conductivity studies in silver oxide based barium vanado–tellurite glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Mixed conductivity studies in silver oxide based barium vanado–tellurite glasses
چکیده انگلیسی

The dc conductivity and frequency dependent ac conductivity of the quaternary glass system x(BaO:1.5 Ag2O)–(95 − x)V2O5–5TeO2, are reported in the frequency range 1 Hz to 32 MHz in the temperature range from room temperature to 433 K. The dc conductivity measured in high temperature range increased with transition metal oxide content while the activation range decreased. The conductivity arises mainly from polaron hopping between V4+ and V5+ ions. High temperature conductivity data satisfy Mott's small polaron hopping model. It is found that a mechanism of non-adiabatic hopping is the most appropriate conduction model for these glasses. A power law behavior σ(ω) = σdc + Aωn (with 0 < n < 1) is well exhibited by the ac conductivity data of the glasses. The activation energy calculated from both the relaxation time and dc conductivity is found to be nearly same in both the cases. A scaling of the conductivity spectra with respect to temperature and composition is attempted and it is observed that the relaxation dynamics of charge carriers in the present glasses is independent of temperature and composition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 149, Issue 1, 15 March 2008, Pages 18–25
نویسندگان
, , , ,