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

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Details zur Publikation

Autorinnen und Autoren: Cicconi MR, de Ligny D, Gallo TM, Neuville DR
Zeitschrift: American Mineralogist
Verlag: Mineralogical Society of America
Jahr der Veröffentlichung: 2016
Band: 101
Heftnummer: 5-6
Seitenbereich: 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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Cicconi, Maria Rita Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
de Ligny, Dominique Prof. Dr.
Professur für Werkstoffwissenschaften (Glas und Keramik)


Einrichtungen weiterer Autorinnen und Autoren

Brazilian Synchrotron Light Laboratory / Laboratório Nacional de Luz Síncrotron (LNLS)
Paris Institute of Earth Physics / Institut de Physique du Globe de Paris (IPGP)


Zitierweisen

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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Zuletzt aktualisiert 2018-06-08 um 13:54