Journal article


Ca neighbors from XANES spectroscopy: A tool to investigate structure, redox, and nucleation processes in silicate glasses, melts, and crystals


Publication Details
Author(s): Cicconi MR, de Ligny D, Gallo TM, Neuville DR
Publisher: Mineralogical Society of America
Publication year: 2016
Volume: 101
Journal issue: 5-6
Pages range: 1232-1235
ISSN: 0003-004X

Abstract

This approach was tested on Ca-aluminosilicate glasses (CAS system) with constant SiO2 content (50 and 76 mol%), ranging from percalcic to peraluminous domains. In alkali-earth aluminosilicate glasses Al and Si are network formers in a large range of compositions, whereas calcium should act either as network modifier and charge compensator. The results obtained show a different Ca behavior as a function of Al content, which in turn is related to the Al local environment. For example, we observe changes in the pre-edge peak centroid energies depending on the changes in the role of Ca as a network modifier (Al = 0 mol%) to charge compensator (aluminosilicate join) to a more complex role in the peraluminous domain, depending on the fraction of Al-[4],Al-[5],Al-[6]. This approach was further applied to study Fe-bearing glasses and, a diopside (CaMgSi2O6) composition at different temperatures. It was possible to correlate the variations occurring in the Ca pre-edge peak centroid positions with both redox state and crystal nucleation mechanism.



How to cite
APA: Cicconi, M.R., de Ligny, D., Gallo, T.M., & Neuville, D.R. (2016). Ca neighbors from XANES spectroscopy: A tool to investigate structure, redox, and nucleation processes in silicate glasses, melts, and crystals. American Mineralogist, 101(5-6), 1232-1235.

MLA: Cicconi, Maria Rita, et al. "Ca neighbors from XANES spectroscopy: A tool to investigate structure, redox, and nucleation processes in silicate glasses, melts, and crystals." American Mineralogist 101.5-6 (2016): 1232-1235.

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