کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1480673 1510417 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase separation and crystallization effects on the structure and durability of molybdenum borosilicate glass
ترجمه فارسی عنوان
جداسازی فاز و اثرات بلور سازی بر ساختار و دوام شیشه بوروسیلیکات مولیبدن
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
The effects of phase separation by nucleation and growth as well as those of crystallization on the structure and the chemical durability of sodium borosilicate glasses enriched in molybdenum oxide were investigated. Increasing concentrations of MoO3 (0 to 10% molar) were added to glasses which were homogeneous (MoO3 ≤ 1.4% molar) or with crystallizations and separated phases (MoO3 > 1.4% molar). Their structure was determined by 11B, 23Na, 29Si and 95Mo MAS NMR, and 23Na MQMAS NMR, coupled with DFT calculations of NMR parameters. Their microstructure and morphology were characterized by X-ray diffraction and by electronic microscopy. These complementary approaches pointed out a decrease in the number of non-bridging oxygens (NBOs) within the vitreous matrix, first initiated by an increase in polymerization for glasses with a low molybdenum oxide content (< 2 % molar), and combined with the decrease in the number of tetrahedral boron for higher contents. Correlations between the chemical durability, the structure and the microstructure of the glasses were then obtained at low and high dissolution reaction progress. The modifications to the chemical composition and to the structure of the surrounding glass induced by increasing MoO3 strongly influenced the matrix durability. Moreover, the nature and the morphology of the separated phases influence the dissolution kinetics by modifying the solution chemistry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 427, 1 November 2015, Pages 120-133
نویسندگان
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