کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4700570 1637719 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Environments of Mg and Al in MgO–Al2O3–SiO2 glasses: A study coupling neutron and X-ray diffraction and Reverse Monte Carlo modeling
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Environments of Mg and Al in MgO–Al2O3–SiO2 glasses: A study coupling neutron and X-ray diffraction and Reverse Monte Carlo modeling
چکیده انگلیسی

The structure of six glass compositions in the MgO–Al2O3–SiO2 system was investigated using neutron and X-ray diffraction. Reverse Monte Carlo modeling was used to reproduce experimental structure factors derived from diffraction experiments. The environment of Mg was determined and corresponds to an average of 5.1 ± 0.1 oxygens at a mean distance of 2.00 ± 0.02 Å with little change as the compositions vary. Tetrahedral, pentahedral and octahedral polyhedra are found with a majority of MgO5. The Al environment reveals the presence of high-coordinated Al in agreement with 27Al Nuclear Magnetic Resonance results. The Reverse Monte Carlo models were used to interpret the structural role of Mg and Al. The [5]Al species show a trend to be localized in the same regions, which have important implications to quantify the Si/Al ordering in aluminosilicate glasses and melts.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 256, Issues 3–4, 15 November 2008, Pages 111–118
نویسندگان
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