Structural evolution of Ni environment in lithium, magnesium and zinc aluminosilicate glasses and glass-ceramics
| Autor: | Olga Dymshits, Aymeric Dugué, Alexander A. Zhilin, Stéphanie Belin, Gérald Lelong, Laurent Cormier, B. Cochain |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Absorption spectroscopy Aluminate Spinel Nucleation Mineralogy engineering.material Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Amorphous solid chemistry.chemical_compound Crystallography chemistry law Materials Chemistry Ceramics and Composites engineering Crystallization Solid solution |
| Zdroj: | Journal of Non-Crystalline Solids. 413:24-33 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2015.01.011 |
| Popis: | Three glasses in the Li2O–Al2O3–SiO2 (LAS), MgO–Al2O3–SiO2 (MAS) and ZnO–Al2O3–SiO2 (ZAS) systems were investigated to obtain spinel-based transparent glass-ceramics doped with TiO2 to induce internal nucleation and with NiO to provide optically active ion. The sequence of phase transformations of initial glasses during heat-treatments was studied by in situ X-ray absorption spectroscopy, X-ray diffraction and room temperature optical spectroscopy. For all glasses, there is a change of Ni2 + coordination with the increase of the heat-treatment temperature. The [5]Ni2+ sites in the parent glass disappear and new distorted [6]Ni2+ sites are formed within aluminotitanate and (Ni, or Ni,Mg, or Ni,Zn) aluminate amorphous regions. The local environment around Ni2+ then evolves from distorted octahedra to regular octahedra due to the nickel-doped spinel crystallization. In LAS glass-ceramics only, Ni2+ incorporates at elevated temperature octahedral and tetrahedral sites in crystals of β-quartz solid solution, whose content increases with time and temperature of heat treatment accompanied by a continuous decomposition or dissolution of spinel. In MAS and ZAS glass-ceramics, Ni-doped spinel exist in the whole temperature range of applied heat-treatments. |
| Databáze: | OpenAIRE |
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