MAS NMR study of soda-lime–silicate glasses with variable degree of polymerisation

Jones, A.; Winter, Rudolf; Greaves, G.N.; Smith, Ian H.

doi:10.1016/s0022-3093(01)00656-1

Cited by 71 publications

(76 citation statements)

References 12 publications

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“…Figure 3a). Figure 3b shows that a higher Jones et al 30 and Deriano et al 6 They found that additions of CaO to a Na2O·SiO2 glass reduced the amount of Q 4 whilst the amount of Q 3 increased 30 and that substitution of MgO for SiO2 lowered the amount of Q 4 as the amount of Q 3 species increased in magnesium sodium silicate glasses 31 . This is also in agreement with Hauret et al 32 who when comparing the imaginary dielectric function of soda-magnesia-silica and soda-lime-silica glasses found that both MgO and CaO behaved similarly as network modifiers.…”

Section: Chemical and Physical Measurementsmentioning

confidence: 90%

Mechanical properties of soda–lime–silica glasses with varying alkaline earth contents

Kilinc

Hand

2015

Journal of Non-Crystalline Solids

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Section: Chemical and Physical Measurementsmentioning

confidence: 90%

Mechanical properties of soda–lime–silica glasses with varying alkaline earth contents

Kilinc

Hand

2015

Journal of Non-Crystalline Solids

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“…Fig. 5b shows the 23 Na NMR spectra, which exhibit a single, broad, slightly asymmetric peak at approximately 15 ppm [50,51]. 23 Na.…”

Section: 1mentioning

confidence: 99%

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

“…5b) exhibit a single, broad, slightly asymmetric peak at approximately 15 ppm [50,51]. Detailed information on the chemical environment for sodium is difficult to obtain due to both the broadening that arises from the distribution of bond angles and the inability to eliminate second-order quadrupolar interactions [50,51]. A study of the sodium environment in a binary sodium tellurite glass system found that increasing concentration of Na 2 O in the glass, caused a change in chemical shift in the 23 Na NMR spectra, which was attributed to a decrease in the sodiumoxygen coordination from six to five [69].…”

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

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Structural and physico-chemical analysis of calcium/strontium substituted, near-invert phosphate based glasses for biomedical applications

Patel¹,

Moss²,

Hossain³

et al. 2017

Acta Biomaterialia

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Neutron diffraction, 23 Na and 31 P NMR and FTIR spectroscopy have been used to investigate the structural effects of substituting CaO with SrO in a 40P 2 O 5 ·(16-x)CaO·20Na 2 O·24MgO·xSrO glass, where x is 0, 4, 8, 12 and 16 mol%. The 31 P solid-state NMR results showed similar amounts of Q 1 and Q 2 units for all of the multicomponent glasses investigated, showing that the substitution of Sr for Ca has no effect on the phosphate network. The M-O coordinations (M= Mg, Ca, Sr, Na) were determined for binary alkali and alkaline earth metaphosphates using neutron diffraction and broad asymmetric distributions of bond length were observed, with coordination numbers that were smaller and bond lengths that were shorter than in corresponding crystals. The Mg-O coordination number was determined most reliably as 5.0(2). The neutron diffraction results for the multicomponent glasses are consistent with a structural model in which the coordination of Ca, Sr and Na is the same as in the binary metaphosphate glass, whereas there is a definite shift of Mg-O bonds to longer distance. There is also a small but consistent increase in the Mg-O coordination number and the width of the distribution of Mg-O bond lengths, as Sr substitutes for Ca. Functional properties, including glass transition temperatures, thermal processing windows, dissolution rates and ion release profiles were also investigated. Dissolution studies showed a decrease in dissolution rate with initial addition of 4 mol% SrO, but further addition of SrO showed little change. The ion release profiles followed a similar trend to the dissolution rates observed. The limited changes in structure and dissolution rates observed for substitution of Ca with Sr in these fixed 40 mol% P 2 O 5 glasses were attributed to their similarities in terms of ionic size and charge.

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“…One peak is centred constantly on the chemical shift, δ iso at -108⋅5 ppm where it has been identified with silicate tetrahedral possessing four bridging oxygens (BOs) expressed in terms of Q 4 species. The other peak is varied in the range of δiso of -90⋅4 to -95⋅5 ppm for coordinating with three bridging oxygens, Q 3 species (Jones et al 2001). When glass basicity increased, the Q 4 peak decreased only in intensity at constant δ iso whereas the Q 3 peak increased both in intensity and in δ iso .…”

Section: Nmr Studiesmentioning

confidence: 99%

Redox ratio and optical absorption of polyvalent ions in industrial glasses

et al. 2007

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The changes in glass structure and redox ratio, R (reduced ion to oxidized ion) of Mn 2+ -Mn 3+ , Cu + -Cu 2+ , Cr 3+ -Cr 6+ , Ni 2+ -Ni 3+ and Co 2+ -Co 3+ couples and optical absorption due to Mn 3+ , Cu 2+ , Cr 3+ , Ni 2+ and Co 2+ ions in industrial soda-lime-silica glass were investigated as a function of Na 2 O concentration in the range 11-19 mol%. With increasing Na 2 O concentration in the experimental glasses, the basicity, expressed as calculated basicity, Λ cal , increased. 29 Si NMR and X-ray diffraction were used to investigate the structural change in glasses. The NMR spectra showed high non-bridging oxygens (NBOs) when the basicity of glass was increased. The results were interpreted to be due to the tetrahedral networks; Q 4 species were depolymerized by replacing the bridging oxygens (BOs) with NBOs to Q 3 species. These results confirmed the shift of broadening peaks of XRD patterns. The redox reactions of the Mn 2+ -Mn 3+ , Cu + -Cu 2+ and Cr 3+ -Cr 6+ couples shifted more toward their oxidized ions due to the oxygen partial pressure, p(O 2 ), during melting and the oxide ion activity, a O2-, increased with increasing glass basicity. These changes caused the redox ratio of these ion couples to decrease. The Ni 2+ -Ni 3+ and Co 2+ -Co 3+ couples were assumed to be present only in the Ni 2+ and Co 2+ ions in these glasses, respectively. The optical absorption bands due to Mn 3+ , Cu 2+ , Cr 3+ , Ni 2+ and Co 2+ ions were also investigated. Their spectra occurred at constant wavelengths with different optical densities or intensities as a function of glass basicity. The increase in the intensities of the absorption bands of these absorbing ions, except for Cr 3+ ion, at the maximum wavelength, depends not only on the ion concentration but also on the increase of polarizability of oxide (-II) species, α oxide(-II) , surrounding the ions. This value affected directly the extinction coefficients of the ions, ε ion . The increase of ε ion caused the colour of glasses appearing in high intensity. In the case of Cr 3+ ion, the results were reversed such that the lower the concentration, the higher the intensities of colour.

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MAS NMR study of soda-lime–silicate glasses with variable degree of polymerisation

Cited by 71 publications

References 12 publications

Mechanical properties of soda–lime–silica glasses with varying alkaline earth contents

Mechanical properties of soda–lime–silica glasses with varying alkaline earth contents

Structural and physico-chemical analysis of calcium/strontium substituted, near-invert phosphate based glasses for biomedical applications

Redox ratio and optical absorption of polyvalent ions in industrial glasses

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