کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9694220 1459642 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical and thermal properties of semiconducting Fe2O3-Bi2O3-Na2B4O7 glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Electrical and thermal properties of semiconducting Fe2O3-Bi2O3-Na2B4O7 glasses
چکیده انگلیسی
xFe2O3-(25 − x)Bi2O3-75Na2B4O7 glasses with x = 5, 10, 15 and 20 mol% were prepared by press-quenching from glass melts, and their dc conductivity (σ) were determined in the temperature range 300-473 K. It is found that the dc conductivity increased from 10−9 to 10−5 S cm−1 with increasing Fe2O3 content. The small polaron hopping (SPH) model of Mott is used for the interpretation of the temperature dependence of the activation energy. Results of thermal analysis performed at different heating rates on these glasses are reported and discussed. From the heating rate dependence of the glass transition temperature (Tg) and the peak temperature of crystallization (Tp) values of the activation energy for glass transition (Et) and the activation energy for crystallization (Ec) are evaluated, and their composition dependence is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 427, Issues 1–2, March 2005, Pages 181-186
نویسندگان
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