Examination of the mixed-alkali effect in (Li,Na) disilicate glasses by nuclear magnetic resonance and conductivity measurements
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Cited by (45)
Mechanical properties of mixed modified oxide glasses
2022, Journal of Non-Crystalline Solids: XCitation Excerpt :The mixed alkali effect on electrical conductivity and glass transition temperature has been found to corelate to the degree of the network polymerization. Ali et al. [52] have examined the structure of (Li,Na) disilicate glasses by 29Si, 7Li and 23Na MAS NMR. The results show only little change of glass network with the alkali substitution, implying the alkali ions are uniformly mixed rather than separated into lithium and sodium-rich domains.
Molecular structure, configurational entropy and viscosity of silicate melts: Link through the Adam and Gibbs theory of viscous flow
2017, Journal of Non-Crystalline SolidsCitation Excerpt :Using 29Si and 23Na Magic Angle Spinning (MAS) NMR spectroscopy, Hater et al. [100] did not observe systematic change of the Qn unit distribution upon Rb-Na mixing in alkali trisilicate glasses. 23Na, 7Li, and 29Si NMR data from (Na,Li)2Si2O5 glasses also suggest an intimate, uniform mixing of the Li and Na alkali metal cations without significant changes in the silicate tetrahedral network [101]. On the other hand, using 6Li, 7Li and 29Si static NMR spectroscopy, Bray et al. [102] observed a linear change of the fraction of Q3 units upon mixing Li and K in disilicate glasses.
Structural study of Ca-Mg and K-Mg mixing in silicate glasses by neutron diffraction
2010, Journal of Non-Crystalline SolidsStructural manifestations of the mixed-alkali effect: NMR studies of sodium rubidium borate glasses
2005, Journal of Non-Crystalline SolidsCitation Excerpt :Assuming statistical mixing of the cations involved, the MAE can be understood to arise from site-mismatch effects and distributions of site energies [4–7]. Statistical cation mixing in various mixed-alkali silicate glasses is indeed supported by numerous molecular dynamics (MD) simulations [7–10], diffraction studies [11,12] and a variety of solid state NMR experiments [13–17]. Fairly direct evidence can be obtained from measurements of internuclear magnetic dipole–dipole interactions, because these can be related to distance distributions in a quantitative manner.
Ca and Na environments in Na<inf>2</inf>O-CaO-Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf> glasses: Influence of cation mixing and cation-network interactions
2004, Chemical GeologyCitation Excerpt :The Na–Ca PPDFs presents also similar oscillations which suggest that Ca is substituted more or less randomly by Na and that Na–Ca pairs are present in the mixed aluminosilicate glasses. These results confirm previous studies on mixed cations silicate glasses (Ali et al., 1995, Gee et al., 1997; Lee and Stebbins, 2003) concluding that cations are intimately mixed within the glass structure rather than segregated in separate alkali-rich regions and alkali-earth-rich regions. However, this cation mixing does not imply a homogeneous cation distribution.