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
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کلمات کلیدی
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 2.5Â GPa, 4Â GPa, 6Â GPa and 7.7Â 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 6Â GPa was associated to the distortion of the SiO4 tetrahedral structure. However, for the sample processed at 7.7Â 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
Journal: Journal of Non-Crystalline Solids - Volume 387, 1 March 2014, Pages 112-116
نویسندگان
Silvio Buchner, Altair Soria Pereira, João Cardoso de Lima, Naira Maria Balzaretti,