Polymerization of silicate and aluminate tetrahedra in glasses, melts, and aqueous solutions—III. Local silicon environments and internal nucleation in silicate glasses

Jong, B.H.W.S. de; Keefer, Keith D.; Brown, Gordon E.; Taylor, Charles M

doi:10.1016/0016-7037(81)90223-4

Cited by 61 publications

(61 citation statements)

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“…De Jong et al (1981) investigated silica-rich alkali silicate glasses using NMR. They reported that both lithium and sodium cations tend to have a bimodal distribution throughout the silicate network and form alkali clusters.…”

Section: The Structure Of Other Alkali Silicate Glassesmentioning

confidence: 99%

“…In contrast to this, potassium, rubidium and cesium cations were observed to exhibit a more uniform distribution. De Jong et al (1981) determined that lithium silicates are more stable with a Q 4 -Q 2 distribution rather than a Q 3 -Q 3 arrangement, resulting in the clustering of lithium pairs around the SiO 4 tetrahedra. These conclusions were supported by Matson et al (1983).…”

Section: The Structure Of Other Alkali Silicate Glassesmentioning

confidence: 99%

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The Structure of Silicate Melts: A Glass Perspective

Henderson

2005

The Canadian Mineralogist

126

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Glasses are widely used as analogues for the study of silicate melts. Although they are solid materials, their structure is inherently complex and diffi cult to study. However, progress has been made in elucidating this structure, its relationship to composition, and how it behaves at high temperatures and pressures. Recent research has brought to light some new fi ndings with important implications for natural melts. These include the observation that the structure is dependent upon the type and size of alkali or alkaline-earth cations incorporated into the glass network, with Li behaving very differently than other alkali cations. In addition, the presence of more than one type of alkali cation can cause non-linear physical behavior. Elements such as Al, Ti and Fe, which play important roles in petrological phenomena, can exhibit coordination environments (e.g., 5-fold) or polyhedral arrangements (e.g., triclusters) that are not common in crystalline phases. Furthermore, polyamorphic phase-transitions may occur at high temperature and pressures; the application of new theoretical models like mean fi eld-constraint hypothesis suggests that several glass phenomena, and probably melt phenomena as well, may be related to stress-rigid to fl oppy transitions. The state of understanding of glass structure, although still rudimentary relative to crystalline materials, has grown exponentially over the last few decades, often with geological researchers at the forefront.Keywords: melts, structure, glasses, petrology, spectroscopy, behavior, model. SOMMAIREOn se sert couramment des verres pour étudier les bains fondus silicatés. Quoiqu'ils sont des matériaux solides, leur structure est naturellement complexe et diffi cile à étudier. Toutefois, des progrès ont été faits dans l'étude de cette structure, sa relation à la composition, et son comportement à températures et pressions élevées. Les projets de recherche récents font ressortir les implications importantes aux bains fondus naturels. A titre d'exemple, la structure dépendrait de la sorte et la taille d'ion alcalin ou alcalino-terreux qui se trouve incorporé dans le réseau du verre. Le Li se comporte de façon très différente des autres alcalins. De plus, la présence de plus d'une sorte d'alcalin peut causer des comportements physiques non-linéaires. Les élements tels Al, Ti et Fe, dont l'importance pétrologique est évidente, peuvent adopter une coordinence inhabituelle, cinq par exemple, et un arrangement polyédrique, des groupements par trois, par exemple, qui ne sont pas communs dans les phases cristallines. De plus, des transitions de phases polyamorphiques pourraient avoir lieu à températures et à pressions élevées. L'application de nouveaux modèles théoriques, par exemple le modèle de contrainte moyenne du champ, fait penser que plusieurs phénomènes impliquant les verres, et tout probablement les bains fondus, pourraient résulter de transitions de matériau rigide face aux contraintes à maté-riau déformable. Quoique les connaissances de la structure du ve...

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Section: The Structure Of Other Alkali Silicate Glassesmentioning

confidence: 99%

Section: The Structure Of Other Alkali Silicate Glassesmentioning

confidence: 99%

The Structure of Silicate Melts: A Glass Perspective

Henderson

2005

The Canadian Mineralogist

126

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“…Using molecular orbital calculations to determine the relative energies of non-bridging and bridging bonds in alkali-silicate melts, DeJong and Brown (1980) concluded that Li atoms in silicate melts tend to cluster while K atoms tend to be more homogeneously distributed. Therefore, the addition of K to a silicate melt produces more non-bridging oxygens per mole of cations and has a more pronounced effect on the melt structure than the addition of the same amount of Li.…”

Section: Variation Of 71v and ?Sl With Composition And Crystallographmentioning

confidence: 99%

The effect of melt composition on the wetting angle between silicate melts and olivine

Wanamaker

Kohlstedt

1991

Phys Chem Minerals

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Abstract. The wetting angle between silicate melts containing Ca, Li, Na, or K and olivine single crystals have been measured as part of an investigation of the dependence of the solid-liquid interfacial energy on melt composition and olivine orientation. The wetting angle increases with increasing silica content of the melt on (100) surfaces, but decreases with increasing silica content on (010) and (001) surfaces. For a given silica content, the wetting angle on (100) decreases in going from Ca to Li to Na to K, while the wetting angle on (010) and (001) increases in going from Ca to K-bearing melts. Based on published values for liquid-vapor interfacial energies, the observed changes in wetting angle with changes in melt composition indicate that the solid-liquid interracial energy increases with increasing silica content of the melt for the (100) surface. However, for (010) and (001) surfaces, the variation of the solid-liquid interfacial energy with silica content depends upon whether Ca or K is present in the melt. In addition, the solidliquid interfacial energy depends upon the orientation ~,(01o) ~. ~,(001) of the olivine in the following manner: rsl -~rs~The melt distribution in a two-phase, solid-plus-melt, system is characterized by the dihedral angle, 0, the angle formed by the melt and two adjoining solid grains when viewed perpendicular to a three-grain junction, as illus-

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“…De Jong and Brown (1980) proposed that the degree to which alkalis "perturb" Si-O-(Si) bonds increases with increasing cation field strength, i.e. Cs < Rb < K < Na < Li.…”

Section: Effect Of Alkalis On Rheological Properties Of Peralkaline Mmentioning

confidence: 99%

“…Cs < Rb < K < Na < Li. De Jong and Brown (1980) and Navrotsky et al (1985) also argued that the smaller alkalis Li and Na should exhibit a greater tendency to destabilize silicate melts when compared to K, Rb, and Cs. These conclusions are confirmed for nominally dry aluminosilicate melts by Hess et al (1995) and Romano et al (2001), who observe an increase of the viscosity with increasing size of the alkali cations in water-free, strongly peralkaline and metaluminous melts, respectively.…”

Section: Effect Of Alkalis On Rheological Properties Of Peralkaline Mmentioning

confidence: 99%