کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1485023 1510529 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Refractive index behavior in phosphate glass from the view point of B3+ and Al3+ coordination
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Refractive index behavior in phosphate glass from the view point of B3+ and Al3+ coordination
چکیده انگلیسی

Higher refractive index and higher Abbe value were obtained simultaneously at B2O3/Al2O3 = 1 in the system of 65P2O5–xAl2O3–(20 − x)B2O3–10CaO–5Li2O, although the refractive index generally shows a positive correlation with the dispersion. We investigated the molar volume and the molar refraction by Lorentz–Lorenz’s formula and also studied the coordination number of 11B and 27Al by MAS NMR. By the replacement of Al2O3 with B2O3, the molar refraction constantly decreased, but the molar volume was minimized at B2O3/Al2O3 = 1. The refractive index behavior of the glasses was mainly determined by the molar volume in the system. The coordination number of B3+ was only IV and it did not change if the composition was changed. On the other hand the coordinations IV, V and VI were observed for Al3+. The ratio of Al3+(VI) was maximized at B2O3/Al2O3 = 1. It is considered that the higher coordination of Al3+ brings the improvement of the packing and it leads to high refractive index.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 2–9, 15 January 2008, Pages 90–93
نویسندگان
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