Chemical gradients at the surface of TiO2-doped cordierite glass-ceramics
| Autor: | Bernd Dr. Rüdinger, Oliver Hochrein, Alessio Zandona, Joachim Deubener |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Nucleation Cordierite 02 engineering and technology engineering.material 01 natural sciences law.invention symbols.namesake law 0103 physical sciences Materials Chemistry Ceramic Crystallization 010302 applied physics Doping 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Reference sample Chemical engineering visual_art Ceramics and Composites visual_art.visual_art_medium symbols engineering 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Non-Crystalline Solids. 547:120298 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2020.120298 |
| Popis: | After crystallizing monolithic cordierite glass samples nucleated by TiO2, ToF-SIMS, GI-XRD and Raman spectroscopic measurements were performed on their surface. Compositional gradients (Mg and Al depletion, Si and Ti enrichment) and a different crystalline assemblage from the one in the interior were identified. The Al-Si ordering process during the indialite-cordierite phase transition appeared moreover to proceed slower on the surface. These differences were absent in the TiO2-free reference sample; they were therefore related to the role of TiO2 as a nucleating agent and to the resulting crystallization sequence. In addition, similar effects were observed in powders of the same composition as the monoliths. |
| Databáze: | OpenAIRE |
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