Neutron diffraction of calcium aluminosilicate glasses and melts
نویسندگان
چکیده
منابع مشابه
Polyhedral units and network connectivity in calcium aluminosilicate glasses from high-energy X-Ray diffraction
Structure factors for Ca (x/2)Al xSi 1-xO (2) glasses (x = 0,0.25,0. 5,0.67) extended to a wave vector of magnitude Q = 40 A (-1) have been obtained by high-energy x-ray diffraction. For the first time, it is possible to resolve the contributions of Si-O, Al-O, and Ca-O coordination polyhedra to the experimental atomic pair distribution functions. It has been found that the connectivity of Si/A...
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We have investigated by (27)Al nuclear magnetic resonance spectroscopy some compositions in the Ln(2)O(3)-Al(2)O(3)-SiO2 (Ln = Y or La) ternary phase diagram containing more than 60 mol % of SiO2. One- and two-dimensional high-field (17.6 T) high-speed (30 kHz) magic angle spinning experiments have been performed along with simulations of the spectra to quantify the amount of penta-coordinated ...
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We studied the dynamics of dissolved water in aluminosilicate glasses with the compositions NaAlSi3O8·0.3H2O, NaAlSi3O8·1.3H2O and Ca0.5AlSi3O8·1.3H2O using quasielastic neutron scattering. As shown by near-infrared spectroscopy on these samples, H2O molecules are the predominant hydrous species in the water-rich glasses whereas OH groups bound to tetrahedrally coordinated cations are predomina...
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In this study, the effect of different parameters such as time and temperature of calcination and milling on the formation of calcium aluminosilicates was investigated. Raw materials used in this study were calcium carbonate and kaolin in high purity. Powder X-ray diffraction patterns were obtained from all samples after heat treatment at various temperatures and times. To study the microstruct...
متن کاملStudy on the observation of Eu2+ and Eu3+ valence states in low silica calcium aluminosilicate glasses.
The optical, magnetic and structural properties of Eu doped low silica calcium aluminosilicate glasses were investigated. The optical absorption coefficient presented two bands at 39,246 and 29,416 cm(-1), which were assigned respectively to the [Formula in text], and [Formula in text] transitions of Eu(2+). The fluorescence measured at 300 K on a sample doped with 0.5 wt% of Eu(2)O(3) exhibite...
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ژورنال
عنوان ژورنال: Journal of Non-Crystalline Solids
سال: 2016
ISSN: 0022-3093
DOI: 10.1016/j.jnoncrysol.2016.05.018