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The crystallization of MgO–Al 2 O 3 –SiO 2 –ZrO 2 glass-ceramics with and without the addition of Y 2 O 3 – a combined STEM/XANES study
Glasses with the mol% composition of 51.9SiO 2 /21.2Al 2 O 3 /21.2MgO/5.7ZrO 2 without and with the addition of 2.5 mol% Y 2 O 3 were melted and subsequently transformed into glass-ceramics via annealing. Both glass-ceramics show strong differences in the microstructure and in the phase composition...
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| Published in: | RSC advances 2016, Vol.6 (67), p.62934-62943 |
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| Main Authors: | , , , , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Glasses with the mol% composition of 51.9SiO
2
/21.2Al
2
O
3
/21.2MgO/5.7ZrO
2
without and with the addition of 2.5 mol% Y
2
O
3
were melted and subsequently transformed into glass-ceramics
via
annealing. Both glass-ceramics show strong differences in the microstructure and in the phase composition after crystallization at 950 °C for 5 h and subsequently at 1060 °C for different annealing times. In the glass without Y
2
O
3
, the main crystal phase is a quartz solid solution accompanied by the precipitation of ZrO
2
and spinel. By contrast, glass-ceramics without the presence of a quartz solid solution were observed after the crystallization of the Y
2
O
3
-containing glass, using the same heat treatment. This is confirmed by analytical scanning transmission electron microscopy analysis and X-ray absorption near-edge structure spectroscopy data gathered at the Zr L
2
-, Y L
2,3
-, Si K- and Al L-edges. Furthermore, using X-ray absorption spectroscopy the coordination of the respective elements is analysed, and changes of the coordination during crystallization are monitored. |
|---|---|
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/C6RA10353G |