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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lopes, Andreia A. S.
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Publications (4/4 displayed)
- 2018Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5citations
- 2016Formation and crystallization of zinc borosilicate glassescitations
- 2016Effect of processing conditions on the properties of recycled cathode ray tube glass foamscitations
- 2014Glass transition and crystallization kinetics of a barium borosilicate glass by a non-isothermal methodcitations
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article
Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5
Abstract
<p>Glasses based on the molar composition 60ZnO·(40-x)B<sub>2</sub>O<sub>3</sub>·xSiO<sub>2</sub>, x = 10 or 20, with small additions of Nb<sub>2</sub>O<sub>5</sub> (2.5, 5, 7.5 and 10 mol%), were prepared by melt-quenching. Increasing the Nb<sub>2</sub>O<sub>5</sub> content decreased the glass transition and softening temperatures. Thermal stability increased with Nb<sub>2</sub>O<sub>5</sub> addition and it was higher for glasses based on the composition having the highest SiO<sub>2</sub> content. The thermal expansion coefficient tended to increase with the Nb<sub>2</sub>O<sub>5</sub> amount. Zinc borate and zinc niobate were identified in glasses containing Nb<sub>2</sub>O<sub>5</sub> ≤ 5 mol%, however in glasses based on the highest SiO<sub>2</sub> composition, an additional crystalline phase, willemite, was detected. At the highest Nb<sub>2</sub>O<sub>5</sub> additions, willemite formation was suppressed and zinc niobate plus zinc borate were detected. The non-isothermal crystallization kinetics was investigated, and the effect of Nb<sub>2</sub>O<sub>5</sub> addition and of the base glass composition on the crystallization activation energy and crystallization mechanism was discussed.</p>