کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484338 1510523 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Iron environment in calcium-soda-phosphate glasses and vitroceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Iron environment in calcium-soda-phosphate glasses and vitroceramics
چکیده انگلیسی

The structure of calcium-soda-phosphate glasses and vitroceramics with relatively high iron content was investigated by X-ray diffraction, electron paramagnetic resonance (EPR) and Mössbauer spectroscopy. The X-ray diffraction analysis proves the vitreous state of the as prepared samples and the development of crystalline phases in the annealed samples. The ferric ions disposed in sites that give rise to the absorption line with gef ≈ 4.3 in the EPR spectra of vitreous samples are not more evidenced in the spectra of the annealed samples, from which only of a symmetric and narrowed line with gef ≈ 2 is recorded. The room temperature 57Fe Mössbauer spectra both of glass and vitroceramic samples consist of two quadrupole doublets characteristic for octahedral sites of Fe2+ and Fe3+ ions. The isomer shift for glass samples decreases and for vitroceramic samples increases with the iron oxide content.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 40–41, 15 October 2008, Pages 4603–4608
نویسندگان
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