کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1480993 1510437 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modifier constraints in alkali ultraphosphate glasses
ترجمه فارسی عنوان
محدودیت های اصلاح کننده در عینک های فوق العاده فشرده قلیایی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
In applying the recently introduced concept of cationic constraint strength [J. Chem. Phys. 140, 214501 (2014)] to bond constraint theory (BCT) of binary phosphate glasses in the ultraphosphate region of xR2O-(1 − x)P2O5 (with x ≤ 0.5 and R = {Li, Na, Cs}), we demonstrate that a fundamental limitation of BCT can be overcome. The modifiers are considered to exist in either “isolated” or “crosslinking” sites, in line with the so-called modifier sub-network [J. Chem. Phys. 140, 154501 (2014)] and each site is associated with a certain number of constraints. We estimate the compositional dependence of the modifier sites and then use this to calculate the glass transition temperature as a function of chemical composition. A statistical distribution of sites achieves a remarkable agreement with experimental data for all tested glasses and greatly improves upon previously published work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 405, 1 December 2014, Pages 12-15
نویسندگان
, , , ,