A discussion about the structural model of “nuclear magnetic resonance studies of glasses in the system Na2OB2O3SiO2”

Xiao, S.Z.

doi:10.1016/0022-3093(81)90086-7

Cited by 41 publications

(24 citation statements)

References 5 publications

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“…Figure 13 shows the correlation between the tetrahedral boron fraction and the glass chemical composition for different R ratios: first assuming the same ratio as in the Dell et al model 10–12 ( R =Na 2 O/B 2 O 3 ), then adding calcium and subtracting the charges compensating zirconium ( R =(Na 2 O+CaO–ZrO 2 )/B 2 O 3 ), and finally excluding calcium as a charge compensator ( R =(Na 2 O–ZrO 2 )/B 2 O 3 ). In the first case (Fig.…”

Section: Resultsmentioning

confidence: 99%

Boron Speciation in Soda‐Lime Borosilicate Glasses Containing Zirconium

Angeli

Charpentier

Ligny

et al. 2010

Journal of the American Ceramic Society

132

156

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Boron speciation was investigated in soda‐lime borosilicate glass containing zirconium. In such compositions, competition between charge compensators (here, sodium and calcium) can occur for the compensation of tetrahedral boron or octahedral zirconium units. 11B MAS NMR is particularly suitable for obtaining data on preferential compensation behavior that directly affects the boron coordination number. In addition to the classical proportions of tri‐ and tetrahedral boron, additional data can be obtained on the contributions involved in these two coordination numbers. An approach is described here based on simultaneous MAS spectrum analysis of borosilicate glass with variable Zr/Si and Ca/Na ratios at two magnetic field strengths (11.7 and 18.8 T), with constraints arising from MQMAS spectroscopy, detailed analysis of satellite transitions, and spin‐echo experiments. New possibilities of 11B NMR were presented for improving the identification and quantification of the different contributions involved in tri‐ and tetrahedral boron coordination. Both NMR and Raman revealed a trend of decreased tetrahedral boron proportion with the increase of Ca/Na ratio or the Zr/Si ratio. This strongly suggests that zirconium compensation takes preference over boron compensation, and that zirconium and boron are both compensated mainly by sodium rather than calcium.

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Section: Resultsmentioning

confidence: 99%

Boron Speciation in Soda‐Lime Borosilicate Glasses Containing Zirconium

Angeli

Charpentier

Ligny

et al. 2010

Journal of the American Ceramic Society

132

156

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“…3). The Dell and Bray model established for ternary borosilicate glass [23][24][25] enables to estimate the proportions of three-coordinate (N 3 ) and four-coordinate (N 4 ) boron according to the chemical composition assuming the existence of particular borosilicate units (diborates, reedmergnerites, etc.). The model is based on the R = Na 2 O/B 2 O 3 and K = SiO 2 /B 2 O 3 molar ratios.…”

Section: Glass Structurementioning

confidence: 99%

Influence of zirconium on the structure of pristine and leached soda-lime borosilicate glasses: Towards a quantitative approach by 17O MQMAS NMR

Angeli

Charpentier

Gaillard

et al. 2008

Journal of Non-Crystalline Solids

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a b s t r a c t 17 O MQMAS NMR was used to characterize the influence of zirconium on the structural organization of soda-lime borosilicate glasses. A new method of quantitative analysis of the 17 O MQMAS spectra is presented, by a direct fit of the two-dimensional MQMAS spectrum which provides the resolution of all the structural groups in glasses containing up to five oxides. Additional data were also obtained from the quantitative deconvolution of the 11 B MAS NMR spectra, with the help of the direct fit of MQMAS data as well. Excess of non-bridging oxygen is clearly identified in these glasses. Sixfolded zirconium is preferentially compensated rather than the tetrahedral boron and calcium only partially compensate the tetrahedral boron. Alteration gels arising from glass leaching were probed by oxygen-17 supplied by the alteration solution. Most of the zirconium is inserted in the silicate network forming Si-O-Zr bonds with the same configuration in the glass and in the gel. During leaching, calcium clearly remains in the alteration gel, either near non-bridging oxygen or as a zirconium charge compensator. This quantitative approach applied to 17 O MQMAS spectra demonstrates its potential for investigating the structure of increasingly complex glass and gel compositions.

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“…As an example, 11 B NMR was first used by Bray et al in order to quantify the proportions of three-and fourcoordinated borons in B 2 O 3 , borate and borosilicate glasses. 15,16 Their later studies led to a structural model, 17,18 which accurately accounted for the boron speciation in sodium borosilicate glasses and was successful enough in predicting many physical and chemical properties of alkaline borosilicate glasses. [19][20][21] In this study, the amount of SiO 2 was fixed at 10 mol% and the amount of BaO was changed in the BaO-B 2 O 3 -SiO 2 ternary glass system.…”

Section: Introductionmentioning

confidence: 98%