کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483820 1510548 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Redox reactions during temperature change in soda-lime–silicate melts doped with copper and iron or copper and manganese
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Redox reactions during temperature change in soda-lime–silicate melts doped with copper and iron or copper and manganese
چکیده انگلیسی

Glasses with the base composition 16Na2O · 10CaO · 74SiO2 doped with copper and iron or copper and manganese were studied by high temperature UV–vis–NIR spectroscopy. The spectra exhibited distinct absorption bands attributed to the respective transition metal ions present (Cu2+, Fe2+, Fe3+, Mn3+). In glasses doped with only one polyvalent element, the absorption decreases linearly with increasing temperature, the absorption bands are shifted to smaller wave numbers and get broader. In glasses doped with two types of transition metals, the situation is the same up to a temperature of around 550 °C. At larger temperature, the Cu2+-absorption in glasses also co-doped with iron increases again, while in glasses doped with both copper and manganese the absorption is approximately the same as in glasses solely doped with copper. It is shown that this is due to redox reactions between polyvalent species. These reactions are frozen in at temperatures <550 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 38–39, 15 October 2006, Pages 4062–4068
نویسندگان
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