Journal ArticleDOI
The structural groups of alkali silicate glasses determined from 29Si MAS-NMR
TLDR
In this paper, the authors investigated 29 Si nuclear magnetic resonance (MAS-NMR) spectroscopy experiments with Li, sodium and potassium silicate glasses containing 20−56 mol% alkali oxide and determined the distribution of SiO 4 structural units as a function of composition.Abstract:
Lithium, sodium and potassium silicate glasses containing 20–56 mol% alkali oxide were investigated by 29 Si nuclear magnetic resonance (MAS-NMR) spectroscopy. In the spectrum of each sample, at least two to four distinct peaks were identified. The distributions of SiO 4 structural units, Q n , where n is the number of bridging oxygen atoms bound to other Si atoms, were determined as a function of composition. The equilibrium constants of the reactions, 2Q n ⇌ Q n −1 + Q n +1 ( n = 3, 2, 1), were determined. The reaction proceeds to the right direction as cationic power of alkali ion ( Z / r ) increases (Li + >Na + >K + ) at the same alkali oxide concentration. The apparent equilibrium constants of the above reactions are discussed along with a proposed thermodynamic model. The 29 Si chemical shifts assigned to each structural unit increase linearly with alkali oxide contents. The slope of these lines decreases as the numbers of attached bridging oxygen (BO) atoms decrease. The average chemical shifts also increase linearly with an increase of alkali content. A close relationship between the average chemical shifts and the theoretical optical basicity was observed.read more
Citations
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Inorganic glasses, glass-forming liquids and amorphizing solids
G. N. Greaves,Sabyasachi Sen +1 more
TL;DR: In this paper, the authors take familiar inorganic oxide glasses and non-oxide glasses and the liquids from which they derive to review the current understanding of their atomic structure, ranging from the local environments of individual atoms to the long-range order which can cover many interatomic distances.
Journal ArticleDOI
The short-range structure of zinc polyphosphate glass
TL;DR: In this paper, the depolymerization of P metaphosphate chains by the addition of ZnO is quantitatively described by the increase in the concentration of Q 1 -phosphate sites, determined from the 31 P MAS-NMR spectra.
Journal ArticleDOI
Structural characterization of noncrystalline solids and glasses using solid state NMR
Journal ArticleDOI
The medium range structure of sodium silicate glasses: a molecular dynamics simulation
Jincheng Du,Alastair N. Cormack +1 more
TL;DR: In this paper, the structure of x Na 2 O (100−− x )SiO 2 ( x ǫ = 0-50) glasses have been studied by molecular dynamics simulation.
Journal ArticleDOI
Bridging, non-bridging and free (O2–) oxygen in Na2O-SiO2 glasses: An X-ray Photoelectron Spectroscopic (XPS) and Nuclear Magnetic Resonance (NMR) study
TL;DR: In this article, high resolution Na 1s, O 1s and Si 2p core level XPS spectra of six Na2O-SiO2 glasses were collected using the Kratos Ultra Axis instrument with its unique charge compensation system.
References
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Journal ArticleDOI
The structure of vitreous silica
R. L. Mozzi,B. E. Warren +1 more
TL;DR: In this paper, a new study of the structure of vitreous silica has been made under greatly improved conditions, using Rh Kα radiation with the method of fluorescence excitation, reliable intensity values were measured to 4π sinθ/λ = 20.
Journal ArticleDOI
Structural studies of silicates by solid-state high-resolution silicon-29 NMR
Journal Article
Structural studies of silicate glasses and melts—applications and limitations of Raman spectroscopy
TL;DR: Raman spectroscopy studies of alkali and alkaline earth silicate glasses and melts are reviewed, and the major Raman bands observed are summarized in this article, where a number of vibrational calculations have been carried out to address this problem.
Journal ArticleDOI
An interpretation of glass chemistry in terms of the optical basicity concept
John A. Duffy,Malcolm D. Ingram +1 more
TL;DR: In this article, the basicity of an oxide glass can be measured experimentally from the frequency shifts in the ultra-violet (UV) (s-p) spectra of probe ions such as Pb2+ and can be expressed on the numerical scale of optical basicity Λ (ideally Λ lies between zero and unity).