2022
DOI: 10.2138/rmg.2022.87.02
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From Short to Medium Range Order in Glasses and Melts by Diffraction and Raman Spectroscopy

Abstract: Figure 2: a) crystalline and b) amorphous structure of SiO2 (small blue spheres: Si atoms, large red spheres: O atoms) shown together with their corresponding x-ray diffraction (Warren 1934a) and Raman (Gross and Ramanova 1929) photographs in c) and d).Figure 4: Raman spectra of SiO2 polymorphs: quartz, cristobalite and glass (redrafted from Neuville et al. (2014)). See the text for the assignment of the BP, R, D1, D2, and other peaks in the glass spectrum.

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Cited by 24 publications
(17 citation statements)
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“…In earlier studies of modified aluminosilicate glasses, these high-frequency Raman band envelopes were often assigned to a convolution of the stretching modes of Q 2 , Q 3 , and Q 4 silicate groups. ,,, However, this assignment cannot be used for the glasses studied here because it would imply depolymerization of the aluminosilicate network, thus contradicting the highly polymerized metaluminous glass structure. In an alternative approach, the high-frequency component bands could represent two sets of Q 4 units differing in their intertetrahedral bond angles, ,,,,,,,, as supported by neutron scattering results . Such distinction of structural units by their intertetrahedral angles implies a uniform distribution of Al and Si atoms, , supported by X-ray scattering as well as our NMR results .…”
Section: Resultsmentioning
confidence: 99%
“…In earlier studies of modified aluminosilicate glasses, these high-frequency Raman band envelopes were often assigned to a convolution of the stretching modes of Q 2 , Q 3 , and Q 4 silicate groups. ,,, However, this assignment cannot be used for the glasses studied here because it would imply depolymerization of the aluminosilicate network, thus contradicting the highly polymerized metaluminous glass structure. In an alternative approach, the high-frequency component bands could represent two sets of Q 4 units differing in their intertetrahedral bond angles, ,,,,,,,, as supported by neutron scattering results . Such distinction of structural units by their intertetrahedral angles implies a uniform distribution of Al and Si atoms, , supported by X-ray scattering as well as our NMR results .…”
Section: Resultsmentioning
confidence: 99%
“…The main intermediate elements are Al 3+ , Pb 4+ , Ti 4+ or Fe 3+ . Aluminum is mainly in coordination 4 [Stebbins and Xu, 1997, Neuville et al, 2004c,a,b, Neuville, 2006, Neuville et al, 2008b,a, Stebbins, 2008, Le Losq et al, 2014, Drewitt et al, 2022, Neuville and Le Losq, 2022. By adding Al 2 O 3 to the NS3 glass composition, viscosity increases strongly and becomes quasi-Arrhenian again, as illustrated in Figure 3 for the viscosity of NA75.6 and NA75.12 (albite glass composition) which contain 6 and 12 mol% of Al 2 O 3 respectively.…”
Section: Cationsmentioning
confidence: 97%
“…Al 3+ in four-fold coordination then plays a role of network former. Al 3+ can also be in five-fold coordination [Neuville et al, 2004c,a,b, Neuville, 2006, Neuville et al, 2008b,a, Le Losq et al, 2014, Drewitt et al, 2022, Neuville and Le Losq, 2022; in this condition, it is even possible to define a role of reticator (i.e. an element that ensures a strong connection between network former elements, according to Patrick Royall et al [2008]).…”
Section: Cationsmentioning
confidence: 99%
“…Le plomb a permis le développement des instruments optiques, lentilles, télescopes, et également les arts de la table et les luminaires avec le cristal au plomb. Le plomb joue un double rôle, car il peut être à la fois formateur de réseau en coordinance 4 créant en général un sous réseau de PbO 4 [28,29,33], mais aussi être un modificateur de réseau en coordinance 6, créant des oxygènes non-pontants sur les tétraèdres de SiO 4 . Le rôle du plomb est complexe aussi bien dans une matrice vitreuse que dans les processus d'altération.…”
Section: La Transition Vitreuseunclassified