F-19 NMR study of the ordering of high field strength cations at fluoride sites in silicate and aluminosilicate glasses

Kiczenski, T. J.; Du, Lin‐Shu; Stebbins, Jonathan F.

doi:10.1016/j.jnoncrysol.2004.03.123

Cited by 60 publications

(90 citation statements)

References 28 publications

(66 reference statements)

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“…This dominant peak could correspond to F-Ca(n) (n represents the number of Ca coordinated with fluorine, and fluorine has an unknown number of exclusively Ca 2+ nearest neighbors, with n typically between 3 and 4) site. [18][19][20][21][22][28][29][30][31] Therefore, most of the fluorine is exclusively coordinate by Ca 2+ in the structure of present glassy slags. According to Zeng and Stebbins, 19) high-frequency shoulder at about -150 ppm may reflect Si-F site.…”

Section: Discussionmentioning

confidence: 99%

Structural Study of Glassy CaO–SiO2–CaF2–TiO2 Slags by Raman Spectroscopy and MAS-NMR

Shu

Chou

2014

ISIJ Int.

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During the production of titanium stabilized stainless steel, as titanium in steel has a tendency to reacting with SiO2 in mould fluxes to generate TiO2 into mould fluxes and mould powder can inevitably pick up Ti-bearing inclusions floating up from steel, TiO2 content in the molten mould fluxes gradually increases so that physiochemical properties of the fluxes change. To evaluate the effect of TiO2 increase in mould fluxes on the structure of the mould flux, the glassy slag system CaO-SiO2-CaF2-TiO2 for stainless steel casting fluxes was studied by combining Raman spectroscopy with 29 in tetrahedral coordination, which cannot change the degree of polymerization of the silicate network. A small amount of Ti enters into the silicate network as the role of network formation, which slightly enhances the degree of polymerization of the silicate network. According to 19 F MAS-NMR spectra, most of the fluorine is exclusively coordinated by Ca 2+ corresponding to F-Ca(n) site and only a few Si-F bonds were observed in samples. Increase of TiO2 content has no significant effects on the F-bonds.

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Section: Discussionmentioning

confidence: 99%

Structural Study of Glassy CaO–SiO2–CaF2–TiO2 Slags by Raman Spectroscopy and MAS-NMR

Shu

Chou

2014

ISIJ Int.

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“…Previous work on F and Cl solution behavior in aluminosilicate melts (Mysen and Virgo 1985;Kohn et al 1991;Schaller et al 1992;Zeng and Stebbins 2000;Mysen et al 2004;Zimova and Webb 2006;Baasner et al 2013) have shown that F preferentially bonds with tetrahedrally coordinated cations such as Al and Si. Although in more complex melts such as basalt, F can also preferentially bond with Mg (Kiczenski et al 2004;Filiberto et al 2012) and form more complex bonds as Al-F-Ca or Al-F-Na (Zeng and Stebbins 2000;Mysen et al, 2004); Si-F and Al-F are always found. Moreover, as NBO/T increases, F bonding and dissolution in silicate melts is favored (Mysen et al 2004).…”

Section: Effect Of Melt Structure On F and CL Partition Coefficientsmentioning

confidence: 99%

Contrasting partition behavior of F and Cl during hydrous mantle melting: implications for Cl/F signature in arc magmas

Dalou

Koga

Voyer

et al. 2014

Prog. in Earth and Planet. Sci.

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We present the results of five experiments on F and Cl partitioning during hydrous mantle melting under conditions relevant to subduction zone magmatism (1.2-2.5 GPa, 1,180°C-1,430°C). For each experiment, we determined the F and Cl partition coefficients between lherzolitic mineral phases (olivine, orthopyroxene (opx), clinopyroxene (cpx), and garnet), amphibole, and hydrous basaltic melts (0.2-5.9 wt.% dissolved H 2 O). At constant pressure, D increases from 0.009 ± 0.0005 to 0.015 ± 0.0008. Experimentally determined F and Cl partition coefficients were used in a hydrous melting model of a lherzolitic mantle metasomatized by slab fluid. In this model, we vary the amount of metasomatic slab fluid added into the mantle while its composition is kept constant. Increasing the amount of fluid results in an increase of both the degree of melting (due to the effect of H 2 O addition) and the F and Cl input in the mantle wedge. Because of the change of F and Cl partition coefficients with the increase of H 2 O, the observed variation in the F and Cl contents of the modeled melts is produced not only by F and Cl input from the fluid, but also by the changes in F and Cl fractionation during hydrous melting. Overall, the model predicts that the Cl/F ratio of modeled melts increases with increasing fluid fraction. Therefore, a variation in the amount of fluid added to the mantle wedge can contribute to the variability in Cl/F ratios observed in arc melt inclusions.

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“…The fluorine in aluminosilicate glass matrix tend to bound with high field strength ions, such as Na + , Al 3+ and rare earth ions [39], [40]. NMR studies of lanthanum containing soda-lime glasses suggest, that the fluorine ions forms Al-F-Na groups [14].…”

Section: Resultsmentioning

confidence: 99%

Upconversion luminescence in erbium doped transparent oxyfluoride glass ceramics containing hexagonal NaYF4 nanocrystals

Šarakovskis

Krieķe

2015

Journal of the European Ceramic Society

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F-19 NMR study of the ordering of high field strength cations at fluoride sites in silicate and aluminosilicate glasses

Cited by 60 publications

References 28 publications

Structural Study of Glassy CaO–SiO2–CaF2–TiO2 Slags by Raman Spectroscopy and MAS-NMR

Structural Study of Glassy CaO–SiO2–CaF2–TiO2 Slags by Raman Spectroscopy and MAS-NMR

Contrasting partition behavior of F and Cl during hydrous mantle melting: implications for Cl/F signature in arc magmas

Upconversion luminescence in erbium doped transparent oxyfluoride glass ceramics containing hexagonal NaYF4 nanocrystals

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