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Dugué, A.; Dymshits, O.; Cormier, L.; Cochain, B.; Lelong, G.; Zhilin, A.; Belin, S.
The Journal of physics and chemistry of solids, 03/2015, Letnik: 78Journal Article
The evolution of Ni2+ environment has been systematically investigated using optical and in situ X-ray absorption spectroscopy (XAS) to determine the influence of nucleating agents (TiO2 and/or ZrO2) during the formation of spinel in magnesium aluminosilicate glass–ceramics. The results were complemented by in situ X-ray diffraction data. According to XAS and optical spectroscopy, the nature of nucleating agents does not modify significantly the Ni environment in initial glasses. However, it has a relatively strong influence in the observed crystallization sequence. Ni2+ ions do not enter the Zr-containing crystalline phase of ZrO2 or ZrTiO4 but a Ni2+ coordination change from the fivefold coordinated sites, with a small amount of tetrahedral sites in parent glasses, to 6Ni2+ and 4Ni2+ sites in spinel (in glasses nucleated by ZrO2 and/or TiO2) or in β-quartz solid solutions (in glasses nucleated by ZrO2) has been found.
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