chemical durability of peraluminous glasses for nuclearcompositional models of glass melt properties and their
Structural study of lanthanum sodium aluminoborosilicate
Nov 01 2020 · The chemical shifts associated with the two species BO 3 and BO 4 − varies little so the nature of the entities does not appear to change significantly during substitution. Boron is mainly present in BO 3 −.We observe a chemical shif of the BO 3 entity of the GX2.5 glass compared to the other glasses in the series and an evolution of about 0.5 ppm towards the highest fields over the
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Structural study of lanthanum sodium aluminoborosilicate
Nov 01 2020 · The chemical shifts associated with the two species BO 3 and BO 4 − varies little so the nature of the entities does not appear to change significantly during substitution. Boron is mainly present in BO 3 −.We observe a chemical shif of the BO 3 entity of the GX2.5 glass compared to the other glasses in the series and an evolution of about 0.5 ppm towards the highest fields over the
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Revealing Spatial Distribution of Al-Coordinated Species
Structure determination of glass remains an important issue in glass science. The electron microscope with its high spatial resolution and versatile functions has been widely applied to observe phase separation and structural heterogeneity in glass. While elemental analysis such as energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) may provide local compositional
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Effects of Irradiation on Albite s Chemical Durability
Albite (NaAlSi3O8) a framework silicate of the plagioclase feldspar family and a common constituent of felsic rocks is often present in the siliceous mineral aggregates that compose concrete. When exposed to radiation (e.g. in the form of neutrons) in nuclear power plants the crystal structure of albite can undergo significant alterations. These alterations may degrade its chemical
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Effects of Irradiation on Albite s Chemical Durability
Albite (NaAlSi3O8) a framework silicate of the plagioclase feldspar family and a common constituent of felsic rocks is often present in the siliceous mineral aggregates that compose concrete. When exposed to radiation (e.g. in the form of neutrons) in nuclear power plants the crystal structure of albite can undergo significant alterations. These alterations may degrade its chemical
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Frontiers Tailoring the Mechanical Properties of
The characterization of aluminosilicate glasses is highly relevant in geosciences and for engineering applications such as reinforcement fibers or touchscreen covers. The incorporation of phosphate as a third network-forming species into these glasses offers unique opportunities for fine-tuning glass properties via changes in glass structure and polymerization. In this work we studied melt
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Effect of composition on peraluminous glass properties An
Jan 01 2017 · Main objectives of this work were to understand the effect of each oxide on peraluminous glass properties and also to optimize the glass formulation by finding the best compromise between melt viscosity and T g. Furthermore this study should provide data on the existence of a MAE in peraluminous glasses and to compare the fluidifying effect
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Structure and composition of surface depletion layers in
contrast aluminosilicate glasses represent a particularly in-teresting case study for examining the impact of poling on glass structure. Al 2O 3 is known to be beneficial to many bulk properties in glass melting and forming and is extremely common as a component in most commercial and technical glasses.
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CNBLithia-alumina-silica containing glass
The chemically tempered glass has among other properties an abraded modulus of rupture of 72 to 78 KPSI and a modulus of rupture of 76 to 112 KPSI. Lithia-alumina-silica containing glass compositions and glasses suitable for chemical tempering and articles made using the chemically tempered glass
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Non-stoichiometric non-bridging oxygens and five
Aug 01 2012 · In the "standard" model of glass structure a glass on the metaluminous join (e.g. glasses with R = 0.5) should be "fully polymerized" and contain only bridging oxygen. It was expected that this would correspond with a viscosity maximum however experiments on multiple sodium calcium and magnesium aluminosilicate melts found that
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Non-stoichiometric non-bridging oxygens and five
Aug 01 2012 · In the "standard" model of glass structure a glass on the metaluminous join (e.g. glasses with R = 0.5) should be "fully polymerized" and contain only bridging oxygen. It was expected that this would correspond with a viscosity maximum however experiments on multiple sodium calcium and magnesium aluminosilicate melts found that
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(PDF) Thermodynamic analysis of the system Na2O-K2O-CaO
Contrib Mineral Petrol (2004) 146 762–778 DOI 10.1007/s O R I GI N A L P A P E R David Dolejsˇ Æ Don R. Baker Thermodynamic analysis of the system Na2O-K2O-CaO-Al2O3-SiO2-H2O- F2O)1 Stability of fluorine-bearing minerals in felsic igneous suites Received 18 December 2002 / Accepted 24 October 2003 / Published online 6 December 2003 Ó Springer-Verlag 2003 Abstract
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Properties of Soda Aluminosilicate Glasses I Refractive
Addition of alumina to sodium silicate glasses considerably improves the mechanical properties and chemical durability and changes other properties such as ionic conductivity and melt viscosity.
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Ab initio molecular dynamics simulation of Na-doped
The structure and properties of sodium aluminosilicate (NAS) glasses are investigated using ab initio molecular dynamics and density functional calculations. Four NAS glass models of about 700 atoms with composition (SiO 2) 0.6 (Al 2 O 3) 0.4-x (Na 2 O) x with Na/Al ratio R = 0.0 0.5 1.0 and 1.5 are constructed corresponding to x = 0 0.135 0.20 and 0.24. . Detailed information on network
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Fluorine in silicate glasses A multinuclear nuclear
relations between resonances observed in the spectra of glasses and those of model compounds but several sophisticated methods are available that can provide direct information on the existence of chemical bonds between NMR-active nu- clei in the sample. These are cross-polarization (PINES et al.
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(PDF) The transition from peraluminous to peralkaline
The glass of type-A melt inclusion contains 27.7 ± 1.0 wt. H 2 O T (total water) the glass of type-B MI contains 30.8 ± 5 wt. H 2 O T demonstrating that both inclusions were trapped near
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Structure of Silicate Glasses and Melts at High Pressure
Despite their strong implications for magmatic processes in the earth s interior and pressure-induced structural changes in other amorphous covalent oxide materials little is known beyond the coordination numbers of the framework cations about the structures of silicate melts and glasses at high pressure. Here we use multinuclear (27Al and 17O) solid-state NMR and quantum chemical
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Structure and composition of surface depletion layers in
contrast aluminosilicate glasses represent a particularly in-teresting case study for examining the impact of poling on glass structure. Al 2O 3 is known to be beneficial to many bulk properties in glass melting and forming and is extremely common as a component in most commercial and technical glasses.
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Glass structure melt structure and dynamics Some
Apr 01 2016 · Glass structure melt structure and dynamics Some concepts for petrology Glass structure melt structure and dynamics Some concepts for petrology Stebbinss Jonathan F 00 00 00 The thermodynamic and transport properties of the aluminosilicate melts at the heart of most magmatic processes vary in complex ways with composition temperature and pressure.
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Titanosilicate glasses are of interest because of their unusual physical and chemical properties including for example the lower thermal expansion of TiO 2-SiO 2 glass than even that of pure SiO 2. Other glass properties affected by TiO 2 include tensile strength refractive index compressibility and resistance to corrosion.
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Compositional Dependence of Solubility/Retention of
Accordingly three different series of aluminoborosilicate glasses (compositional complexity being added in a tiered approach) with varying MoO3 concentrations have been synthesized and characterized for their ability to accommodate molybdate ions in their structure (solubility) and as a glass
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Chemical Durability of Glass SpringerLink
The term chemical durability has been used conventionally to express the resistance offered by a glass towards attack by aqueous solutions and atmospheric agents. There is no absolute or explicit measure of chemical durability and glasses are usually graded relative to one another after subjecting them to similar experimental conditions
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This structural observation can explain the anomalous variations of viscosity and glass transition temperatures for the glasses with low silica content (Neuville et al. 2004bCormier et al. 2005).Substituting Ca by Mg influences the glass and melt properties since the Mg 2 ion has a smaller radius and higher field strength than Ca 2 (Shannon
Get Price(PDF) Reaction sintered glass a durable matrix for spinel
Reaction sintered glass a durable matrix for spinel-forming nuclear waste compositions. Journal of Nuclear Materials 2000. Rodney C Ewing. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.
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CNALithia-alumina-silica containing glass
The chemically tempered glass has among other properties an abraded modulus of rupture of 72 to 78 KPSI and a modulus of rupture of 76 to 112 KPSI. Lithia-alumina-silica containing glass compositions and glasses suitable for chemical tempering and articles made using the chemically tempered glass
Get Price(PDF) Homogeneity of peraluminous
The influence of the peraluminous glass composition on the lanthanide Glass SiO2 B2O3 Al2O3 Na2O CaO Nd2O3 solubility and glass homogeneity was investigated at two different G0.26Nd0 57.45 14.90 17.02 6.38 4.25 0.00 cooling rates quenching in air and slow cooling (1 °C min−1) the latter G0.26Nd2.3 56.13 14.56 16.64 6.24 4.16 2.27 to
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Melt-vapor solubilities and elemental partitioning in
Vapor-saturated experiments at 200 MPa with peraluminous lithophile-element-rich rhyolite obsidian from Macusani Peru reveal high miscibility of H2O and silicate melt components. The H2O content of melt at saturation (11.5 -0.5 wt. ) is almost twice that predicted by existing melt speciation models. The corresponding solubility of melt components in vapor decreases from 15 wt. dissolved
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(PDF) Melt-vapor solubilities and elemental partitioning
Contrib Mineral Petrol (1988) 99 Contributions to Mineralogy and Petrology 9 Springer-Verlag1988 Melt-vapor solubilities and elemental partitioning in peraluminous granite-pegmatite systems experimental results with Macusani glass at 200 MPa David London Richard L. Hervig and George B. VI School of Geology and Geophysics University of Oklahoma Norman OK
Get PriceHigh Elastic Moduli of a 54Al 2 O 3 -46Ta 2 O 5 Glass
Oct 15 2015 · Glasses with high elastic moduli and high hardness values have been in demand for many years because the thickness of sheet glass with these properties can be decreased while maintaining its strength.
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