Effect of Al2O3 on phase formation and thermal expansion of a BaO-SrO-ZnO-SiO2 glass ceramic
| Autor: | Christian Patzig, Michael Kracker, Thomas Höche, Christian Rüssel, Christian Thieme, Marek Sierka, Andreas Erlebach |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2018 |
| Předmět: |
Glass-ceramic
Materials science Process Chemistry and Technology Analytical chemistry Mineralogy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Thermal expansion Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Differential scanning calorimetry law Transmission electron microscopy Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites Crystallization 010306 general physics 0210 nano-technology Stoichiometry Solid solution |
| Zdroj: | Ceramics International. 44:2098-2108 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2017.10.159 |
| Popis: | A glass from the system BaO-SrO-ZnO-Al 2 O 3 -SiO 2 was synthesized and the crystallization behavior was studied using differential scanning calorimetry, X-ray diffraction, and scanning and transmission electron microscopy. The main phase precipitating is a Ba 1−x Sr x Zn 2 Si 2 O 7 solid solution with very low thermal expansion. The formation of this phase leads to a decrease of the coefficients of thermal expansion of sintered and afterwards crystallized powder compacts. The addition of Al 2 O 3 leads to the formation of another phase at the early stage of crystallization, which disappears after longer heat treatments or at elevated temperatures. For comparison, a stoichiometric powder with the composition Ba 0.5 Sr 0.5 Zn 1.9 Si 1.9 Al 0.2 O 7 was prepared via a solid-state reaction in order to verify whether or not Al 3+ -ions can be incorporated into the crystal structure. This phase does not exist as a single-phase material, which means that the addition of Al 2 O 3 leads to the formation of small concentrations of secondary phases. |
| Databáze: | OpenAIRE |
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