Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods
This study used a combined viscosity approach to determine theoretical fibre drawing points for glasses in the series: xP2O5, 24MgO, 16CaO, (60-x)Na2O (x = 0,45,50,55) and yP2O5, 24MgO, 16CaO, (55-y)Na2O, 5Fe2O3 (y = 40,45,50,55). The points cannot be measured directly since the glasses are only ki...
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| Format: | Article |
| Language: | English |
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Elsevier B.V.
2015
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| Online Access: | http://irep.iium.edu.my/48552/ http://irep.iium.edu.my/48552/1/Viscosity_profiles_of_phosphate_glasses_through_combined_quasi-static_and_bob-in-cup_methods.pdf |
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| author | Parsons, A.J. Sharmin, N. Syed Shaharuddin, Sharifah Imihezri Marshall, M. |
| author_facet | Parsons, A.J. Sharmin, N. Syed Shaharuddin, Sharifah Imihezri Marshall, M. |
| author_sort | Parsons, A.J. |
| building | IIUM Repository |
| collection | Online Access |
| description | This study used a combined viscosity approach to determine theoretical fibre drawing points for glasses in the series: xP2O5, 24MgO, 16CaO, (60-x)Na2O (x = 0,45,50,55) and yP2O5, 24MgO, 16CaO, (55-y)Na2O, 5Fe2O3
(y = 40,45,50,55). The points cannot be measured directly since the glasses are only kinetically stable at these
points and would crystallise if allowed to equilibrate. Quasi-static and bob-in-cup viscosity data from above
and below the range of interest were fitted to the Vogel–Fulcher–Tammann equation and provided good agreement.
The theoretical drawing points were taken as the temperature at which the glass has a viscosity of
2 Log Pa·s, based on the known drawing point viscosity of silica glasses. The theoretical drawing points for the
glasses ranged from 657 to 839 °C. The viscosity information was also used to assess the fragility of the glasses in comparison with a borosilicate standard by using Doremus and Angell parameters. All of the glasses were of low viscosity and high fragility in comparison to the borosilicate. The fragility improved above 50% content of phosphate in the glass and the addition of iron had little effect on the fragility. Additionally, the limitations of the borosilicate 717a standard glass and the measurement of Tg are discussed. |
| first_indexed | 2025-11-14T16:19:25Z |
| format | Article |
| id | iium-48552 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T16:19:25Z |
| publishDate | 2015 |
| publisher | Elsevier B.V. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-485522016-02-25T01:33:07Z http://irep.iium.edu.my/48552/ Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods Parsons, A.J. Sharmin, N. Syed Shaharuddin, Sharifah Imihezri Marshall, M. T Technology (General) TP248.13 Biotechnology TP785 Clay industries. Ceramics. Glass. Cement industries This study used a combined viscosity approach to determine theoretical fibre drawing points for glasses in the series: xP2O5, 24MgO, 16CaO, (60-x)Na2O (x = 0,45,50,55) and yP2O5, 24MgO, 16CaO, (55-y)Na2O, 5Fe2O3 (y = 40,45,50,55). The points cannot be measured directly since the glasses are only kinetically stable at these points and would crystallise if allowed to equilibrate. Quasi-static and bob-in-cup viscosity data from above and below the range of interest were fitted to the Vogel–Fulcher–Tammann equation and provided good agreement. The theoretical drawing points were taken as the temperature at which the glass has a viscosity of 2 Log Pa·s, based on the known drawing point viscosity of silica glasses. The theoretical drawing points for the glasses ranged from 657 to 839 °C. The viscosity information was also used to assess the fragility of the glasses in comparison with a borosilicate standard by using Doremus and Angell parameters. All of the glasses were of low viscosity and high fragility in comparison to the borosilicate. The fragility improved above 50% content of phosphate in the glass and the addition of iron had little effect on the fragility. Additionally, the limitations of the borosilicate 717a standard glass and the measurement of Tg are discussed. Elsevier B.V. 2015-01-15 Article PeerReviewed application/pdf en http://irep.iium.edu.my/48552/1/Viscosity_profiles_of_phosphate_glasses_through_combined_quasi-static_and_bob-in-cup_methods.pdf Parsons, A.J. and Sharmin, N. and Syed Shaharuddin, Sharifah Imihezri and Marshall, M. (2015) Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods. Journal of Non-Crystalline Solids, 408. pp. 76-86. ISSN 0022-3093 http://www.sciencedirect.com/science/article/pii/S0022309314005341 doi:10.1016/j.jnoncrysol.2014.10.014 |
| spellingShingle | T Technology (General) TP248.13 Biotechnology TP785 Clay industries. Ceramics. Glass. Cement industries Parsons, A.J. Sharmin, N. Syed Shaharuddin, Sharifah Imihezri Marshall, M. Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title | Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title_full | Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title_fullStr | Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title_full_unstemmed | Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title_short | Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| title_sort | viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods |
| topic | T Technology (General) TP248.13 Biotechnology TP785 Clay industries. Ceramics. Glass. Cement industries |
| url | http://irep.iium.edu.my/48552/ http://irep.iium.edu.my/48552/ http://irep.iium.edu.my/48552/ http://irep.iium.edu.my/48552/1/Viscosity_profiles_of_phosphate_glasses_through_combined_quasi-static_and_bob-in-cup_methods.pdf |