کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7900678 1510394 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural studies on new xCeO2·(50 − x)PbO·50B2O3 glasses and glass ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural studies on new xCeO2·(50 − x)PbO·50B2O3 glasses and glass ceramics
چکیده انگلیسی
Influence of CeO2 substitution for PbO on network structure of the glasses in the system xCeO2 −(50 − x)PbO·50B2O3 (0 ≤ x ≤ 50 mol%) has been studied. Stretching and bending vibrations due to CeO, PbO and BO bonds were assigned on the bases of their FTIR absorbance spectra. The quantitative values represent CeO4, PbO4 and BO4 species have been determined. The results were correlated with data based on X-Ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Electron Diffraction Pattern (EDP) spectroscopies. The fraction of different tetrahedral structural units (B4) is a significant variable parameter in altering the structure changes. The determined values of fraction of tetrahedral boron (N4) obtained from FTIR spectra agree well with that obtained from 11B MAS NMR spectra of the same glasses having ≤ 7.5 mol% CeO2. The lowest value of fraction of tetrahedral groups (B4) is found at 50 mol% CeO2 (lead free glass). In this regard, 50CeO2-50B2O3 composition showed lower value of B4 than that found in 50PbO-50B2O3 glass.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 452, 15 November 2016, Pages 291-296
نویسندگان
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