کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7900316 1510367 2018 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of Er2O3 content on heat capacity, thermodynamic functions and vitrification characteristics of Er3 +-doped tellurite glass
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effects of Er2O3 content on heat capacity, thermodynamic functions and vitrification characteristics of Er3 +-doped tellurite glass
چکیده انگلیسی
A series of samples of high-purity glasses TeO2-WO3-La2O3-Er2O3-Bi2O3 with different mole content of Er2O3 was synthesized. The total content of the 3d-transition metals impurities did not exceed 0.1-2 ppm wt., the hydroxyl groups absorption near ~ 3 μm was as low as 0.001-0.01 cm− 1. The glasses have been studied by differential scanning calorimetry. Glass transition temperatures were determined; for the highest Er2O3 concentrations the thermal effects of crystallization were observed at the heating rate of 5 K/min. The temperature dependences of heat capacity C°p = f(T) in the range of 320-1050 K were found. Using the experimental data the standard thermodynamic functions were calculated: enthalpy H°(T) − H°(0), entropy S°(T) − S°(0) and Gibbs energy G°(T) − G°(0) in vitreous and “supercooled liquid” states. Model and parametric similarity of properties within the framework of statistical approach with determined correlation dependencies of parameters on composition makes it possible to predict the thermodynamic functions for other compositions of glasses within the system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 480, 15 January 2018, Pages 95-99
نویسندگان
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