Evolution of the Ni2+ Environment During the Formation of a MgO-Al2O3-SiO2 Glass-Ceramic: A Combined XRD and Diffuse Reflectance Spectroscopy Approach - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the American Ceramic Society Année : 2012

Evolution of the Ni2+ Environment During the Formation of a MgO-Al2O3-SiO2 Glass-Ceramic: A Combined XRD and Diffuse Reflectance Spectroscopy Approach

Résumé

The effect of the addition of NiO on the crystallization mechanisms has been studied for SiO2-Al2O3-MgO glass-ceramics. A detailed Rietveld analysis has been made to determine the chemical composition and the cation distribution in the spinel phase and the evolution of Ni2+ coordination site using diffuse reflectance spectroscopy. Powder X-ray diffraction (XRD) results show the formation of b-quartz and spinel and the nickel fraction in the spinel phase decreasing as the plateau temperature increases. The determination of cation distribution in spinel using XRD reveals a preference of Ni2+ and Al3+ for octahedral sites and an increasing proportion of Ni2+ in tetrahedral sites for heat treatments at high temperature (1100°C- 1200°C). Diffuse reflectance spectroscopy shows that Ni2+ is mainly fivefold coordinated in the starting glass, playing an important role in the crystallization of the spinel phase and it confirms the presence of tetrahedral and octahedral Ni2+ in the glass-ceramics. The combination of these two techniques also indicates a chemical heterogeneity of spinel crystals with Ni2+-rich and Mg2+-rich zones.

Dates et versions

hal-01024707 , version 1 (16-07-2014)

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Aymeric Dugue, Laurent Cormier, Olivier Dargaud, Laurence Galoisy, Georges Calas. Evolution of the Ni2+ Environment During the Formation of a MgO-Al2O3-SiO2 Glass-Ceramic: A Combined XRD and Diffuse Reflectance Spectroscopy Approach. Journal of the American Ceramic Society, 2012, 95 (11), pp.3483-3489. ⟨10.1111/j.1551-2916.2012.05421.x⟩. ⟨hal-01024707⟩
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