Nuclear Magnetic Resonance and Electron Paramagnetic Resonance Studies of Glass

Zwanziger, Josef W.; Werner‐Zwanziger, Ulrike; Calahoo, Courtney; Paterson, Alexander L.

doi:10.1007/978-3-319-93728-1_28

Cited by 3 publications

(8 citation statements)

References 219 publications

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“…18 and 13 ppm, respectively. [67][68][69][70][71] The different B 3 environments can be resolved using 11 11 B MAS NMR provides initial results that are comparable to the IR and Raman spectroscopy data that will be discussed in subsequent sections. Increasing B 2 O 3 content for SiO 2 , NaBSi1 (R = 2.0) to NaBSi5 (R = .5), results in the reduction of relative populations of tetrahedral borate in favor of trigonal borate species.…”

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 59%

“…Ring and nonring forming B 3 units are attributed to the higher and lower shift values seen at ca. 18 and 13 ppm, respectively 67–71 . The different B 3 environments can be resolved using 11 B 3QMAS NMR or with careful peak fitting of the MAS NMR spectra.…”

Section: Resultsmentioning

confidence: 99%

“…−3 to 5 ppm, and trigonal three‐coordinated boron is attributed to the higher shifts seen between ca. 5 and 20 ppm 32,67–71 . Shift positions of both B 4 and B 3 are strongly influenced by glass composition, K ‐ and R ‐values, and local structure surrounding the probed boron.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental 11 B MAS NMR spectra for the NBSs, shown in Figure 5, allows for boron speciation and quantification of relative populations of both three-and fourfold coordinated boron, B 3 and B 4 , respectively (the subscript denotes the boron coordination), as seen in Table 1. [65][66][67] Tetrahedral four-coordinated boron has a shift typically centered at ca. −3 to 5 ppm, and trigonal three-coordinated boron is attributed to the higher shifts seen between ca.…”

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

“…5 and 20 ppm. 32,[67][68][69][70][71] Shift positions of both B 4 and B 3 are strongly influenced by glass composition, K-and R-values, and local structure surrounding the probed boron. The nearest cation neighbor strongly influences the B 4 shift, where a higher shift is associated with boron being connected to additional borate and less silicate structural units, where B 4 (1B, 3Si) and B 4 (0B, 4Si) has been assigned to 0 and −2 ppm, respectively.…”

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

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Structure‐terahertz property relationship in sodium borosilicate glasses

Tostanoski

Möncke

Youngman

et al. 2022

Int J of Appl Glass Sci

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We report, for the first time, an early evidence of structure‐terahertz (THz) property relationship for two tie‐lines within the sodium borosilicate glass system. The NaBSi series was chosen to study the effect of the substitution of silicon dioxide for boron oxide, whereas the BNaSi series studies the substitution of silicon dioxide for sodium oxide. Nuclear magnetic resonance, infrared absorption, and Raman spectroscopies were used to determine structural changes across both series. THz time‐domain spectroscopy was used to record the refractive index over the measured bandwidth. Individual measurements at .502 THz were used as a frequency of focus for comparisons. The foundation for the proposed structure‐THz property relationship is based on higher measurable THz refractive index changes correlated to a depolymerized glass network, R > .5, a network consisting of SiO4 tetrahedra and charge‐deficient [BØ4]− tetrahedra‐forming borosilicate danburite and reedmergnerite rings with mixed Si–O–B bridges, and the formation of nonbridging oxygen (nbO) atoms on silicate tetrahedra. A polymerized glass network, R < .5, consists of homonuclear boroxol and silica rings within sodium borate and silicate subnetworks. Calculated and experimental fractions of tetrahedral borate and silicate tetrahedra with one nbO, optical basicity, density, and network connectivity data support the structure‐THz property relationship.

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Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

See 3 more Smart Citations

Structure‐terahertz property relationship in sodium borosilicate glasses

Tostanoski

Möncke

Youngman

et al. 2022

Int J of Appl Glass Sci

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Effect of femtosecond laser irradiation on structure‐terahertz property relationship in sodium borosilicate glasses

Tostanoski

Youngman

Sundaram

2023

Int J of Appl Glass Sci

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We report the effect of high‐repetition rate femtosecond (fs) laser irradiation on structure‐terahertz (THz) property relationship for sodium borosilicate glasses. We have used nuclear magnetic resonance (NMR), terahertz time‐domain spectroscopy (THz‐TDS), and Raman spectroscopy to examine pristine and laser irradiated regions of these glasses to determine and quantify boron speciation, THz refractive index, n(THz), and change (Δn) in n(THz), and spectral, that is, structural, changes due to laser exposure, respectively. Our results suggest that laser irradiation‐induced Δn(THz) values are dependent upon the glass composition, structural units, connectivity, and network, for example, the corresponding K‐ and R‐values of the borosilicate glass. Depolymerized glass networks show no changes in NMR B4 signal, slight changes in Raman spectral changes related to silicate structural units, for example, increase in Q3 tetrahedra with one nonbridging oxygen (nbO) atom, and higher measurable n(THz) and Δn(THz). More polymerized glasses, on the other hand, show changes in NMR B4 signal, varying degrees of Raman spectral changes in the borate subnetwork and structural units, and lower n(THz) and Δn(THz). The THz refractive index is most sensitive to modifier ions in the glasses, which are directly responsible for nbO formation, glass structure, and network polymerization.

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The Short-Range Order (SRO) and Structure

Henderson

Stebbins

2022

Reviews in Mineralogy and Geochemistry

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Nuclear Magnetic Resonance and Electron Paramagnetic Resonance Studies of Glass

Cited by 3 publications

References 219 publications

Structure‐terahertz property relationship in sodium borosilicate glasses

Structure‐terahertz property relationship in sodium borosilicate glasses

Effect of femtosecond laser irradiation on structure‐terahertz property relationship in sodium borosilicate glasses

The Short-Range Order (SRO) and Structure

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