Role of aluminium in the silicate network: In situ, high-temperature study of glasses and melts on the join SiO2-NaAlO2

Neuville, Daniel R.; Mysen, Bjørn O.

doi:10.1016/0016-7037(96)00049-x

Cited by 202 publications

(193 citation statements)

References 24 publications

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“…7. MAS-0M glass reveals two prominent broad bands centred at ~980 cm -1 and ~550 cm -1 , which are assigned to the vibrations of Si-O stretching modes and Si-O-Si bending modes in depolymerised structural units [30][31], respectively. Molybdate incorporation results in two new bands positioned at ~320 cm -1 and ~965 cm -1 , respectively.…”

Section: Raman Spectramentioning

confidence: 99%

MoO3 incorporation in magnesium aluminosilicate glasses

Tan

Ojovan

Hyatt

et al. 2015

Journal of Nuclear Materials

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Section: Raman Spectramentioning

confidence: 99%

MoO3 incorporation in magnesium aluminosilicate glasses

Tan

Ojovan

Hyatt

et al. 2015

Journal of Nuclear Materials

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“…5). A band near 1150 cm À1 is commonly assigned to SiAO stretching in fully polymerized Q 4 structural units (McMillan et al, 1982;Seifert et al, 1982;Matson et al, 1986;McMillan and Wolf, 1995;Neuville and Mysen, 1996). A band near 450 cm À1 is assigned to SiAO rocking motion in fully polymerized Q 4 units (McMillan et al, 1982;McMillan and Wolf, 1995).…”

Section: Raman Spectroscopymentioning

confidence: 99%

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Mysen

Fogel

Morrill

et al. 2009

Geochimica et Cosmochimica Acta

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The solubility and solution mechanisms of reduced CAOAH volatiles in Na 2 OASiO 2 melts in equilibrium with a (H 2 + CH 4 ) fluid at the hydrogen fugacity defined by the iron-wü stite + H 2 O buffer [f H2 (IW)] have been determined as a function of pressure (1-2.5 GPa) and silicate melt polymerization (NBO/Si: nonbridging oxygen per silicon) at 1400°C. The solubility, calculated as CH 4 , increases from $0.2 wt% to $0.5 wt% in the melt NBO/Si-range $0.4 to $1.0. The solubility is not significantly pressure-dependent, probably because f H2 (IW) in the 1-2.5 GPa range does not vary greatly with pressure. Carbon isotope fractionation between methane-saturated melts and (H 2 + CH 4 ) fluid varied by $14& in the NBO/Si-range of these melts. The (C..H) and (O..H) speciation in the quenched melts was determined with Raman and 1 H MAS NMR spectroscopy. The dominant (C..H)-bearing complexes are molecular methane, CH 4 , and a complex or functional group that includes entities with C"CAH bonding. Minor abundance of complexes that include SiAOACH 3 bonding is tentatively identified in some melts. There is no spectroscopic evidence for SiAC or SiACH 3 . Raman spectra indicate silicate melt depolymerization (increasing NBO/Si). The [CH 4 /C"CAH] melt abundance ratio is positively correlated with NBO/Si, which is interpreted to suggest that the (C"CAH)-containing structural entity is bonded to the silicate melt network structure via its nonbridging oxygen. The $14& carbon isotope fractionation change between fluid and melt is because of the speciation changes of carbon in the melt.

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“…Therefore, it is not surprising that the most significant TOT1 band broadening is observed in the Si-poor, alkali-and alkali-earth rich phonolite glasses from Pollena. TOT2 is classically assigned to the T-O stretching of Q n species (Q, TO 4 units; n, number of bridging oxygens) and its spectral composition is strongly influenced by substitution of Al 3+ and Fe 3+ for Si 4+ as network-forming cation (Mysen, 1988, Neuville and Mysen, 1996and Sharma et al, 1997. In natural volcanic glasses, relative intensity of TOT1/TOT2 decreases with glass depolymerization .…”

Section: Influence Of Glass Composition and Structure On Water Band Nmentioning

confidence: 99%

Quantification of water content and speciation in natural silicic glasses (phonolite, dacite, rhyolite) by confocal microRaman spectrometry

Muro

Villemant

Montagnac

et al. 2006

Geochimica et Cosmochimica Acta

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The determination of total water content (H 2 O T : 0.1-10 wt%) and water speciation (H 2 O molecular /OH) in volcanic products by confocal microRaman spectrometry are discussed for alkaline (phonolite) and calcalkaline (dacite and rhyolite) silicic glasses. Shape and spectral distribution of the total water band (H 2 O T ) at 3550 cm −1 show systematic evolution with glass H 2 O T , water speciation and NBO/T. In the studied set of silicic samples, calibrations based on internal normalization of the H 2 O T band to a band related to vibration of aluminosilicate network (TOT) at 490 cm −1 vary with glass peraluminosity. An external calibration procedure using well-characterized glass standards is less composition-dependent and provides excellent linear correlation between total dissolved water content and height or area of the H 2 O T Raman band. Accuracy of deconvolution procedure of the H 2 O T band to quantify water speciation in water-rich and depolymerized glasses depends on the strength of OH hydrogen bonding. System confocal performance, scattering from embedding medium and glass microcrystallinity have a crucial influence on accuracy of Raman analyses of water content in glass-bearing rocks and melt inclusions in crystals.

show abstract

Role of aluminium in the silicate network: In situ, high-temperature study of glasses and melts on the join SiO2-NaAlO2

Cited by 202 publications

References 24 publications

MoO3 incorporation in magnesium aluminosilicate glasses

MoO3 incorporation in magnesium aluminosilicate glasses

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Quantification of water content and speciation in natural silicic glasses (phonolite, dacite, rhyolite) by confocal microRaman spectrometry

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