کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7902432 1510451 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
X-ray study of lithium disilicate glass: High pressure densification and polyamorphism
ترجمه فارسی عنوان
بررسی اشعه ایکس شیشه لیتیوم دیسیلیک: فشار بالا و پلی آمورفیسم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
We have investigated the structural changes induced by high-pressure in lithium disilicate glass with stoichiometric composition Li2O.2SiO2 (LS2). Using toroidal type high-pressure chambers, glass samples were processed at 2.5 GPa, 4 GPa, 6 GPa and 7.7 GPa at room temperature. Synchrotron X-ray diffraction measurements were used to obtain the radial distribution functions (RDF) in order to follow the structural changes induced after processing at high pressure. Compared to a pristine sample, the main change observed for the samples processed up to 6 GPa was associated to the distortion of the SiO4 tetrahedral structure. However, for the sample processed at 7.7 GPa, a drastic change in the RDF indicated the formation of a distinct amorphous phase. The observed polyamorphism is important for a better understanding of the nucleation kinetics of crystalline phases under high pressure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 387, 1 March 2014, Pages 112-116
نویسندگان
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