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| Grohsjean, Alexander |
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| Falmagne, G. |
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| Erice, C. |
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| Hernandez, A. M. Vargas |
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| Leiton, A. G. Stahl |
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| Lipka, K. |
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| Pantaleo, F. |
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| Torterotot, L. |
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| Savina, M. |
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| Cerri, O. |
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| Jung, A. W. |
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| Chiarito, B. |
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| Sahin, M. O. |
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| Strong, G. |
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| Saradhy, R. |
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| Joshi, B. M. |
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| Kaynak, B. |
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| Barrera, C. Baldenegro |
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| Longo, Egidio |
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| Kolberg, Ted |
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| Ferguson, Thomas |
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| Leverington, Blake |
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| Haase, Fabian |
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| Heath, Helen F. |
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| Kokkas, Panagiotis |
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Deubener, J.
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Topics
Publications (9/9 displayed)
- 2023Hydrogen Permeability of Tectosilicate Glasses for Tank Barrier Liners
- 2022Silver dissolution and precipitation in an Na2O–ZnO–B2O3 metallization paste glasscitations
- 2021Reducing the raw material usage for room temperature infusible and polymerisable thermoplastic CFRPs through reuse of recycled waste matrix materialcitations
- 2020Hydrogen Permeation Through Glasscitations
- 2019Density, elastic constants and indentation hardness of hydrous soda-lime silica glassescitations
- 2018Updated definition of glass-ceramicscitations
- 2016Water, the other network modifier in borate glassescitations
- 2012Hardness and crack behavior of compressed borate glasses
- 2011Crystallization kinetics of LaF3 nanocrystals in an oxyfluoride glasscitations
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article
Water, the other network modifier in borate glasses
Abstract
In the present study we have investigated whether the effect of water on properties of borate glasses resembles that of alkali oxide. Soda-lime-borate glasses with nominal compositions of x Na2O, 10 CaO, (90-x) B2O3 (x = 5, 15 and 25 mol%) were doped with up to 8 wt.% H2O by processing glass powder + distilled water in platinum capsules in an internally heated gas pressure vessel at 1523 K and 500 MPa. The water content of hydrous glasses was determined by Karl-Fischer titration and near-infrared spectroscopy. The glass transition temperature T-g. was derived from DTA and micropenetration experiments for which the effect of water loss at the surface of the hydrous glasses was studied. Heating glass samples at 10 K min(-1) in the DTA resulted in T-g values which are close to T-12 isokom temperatures confirming the equivalence of enthalpy relaxation and viscous relaxation for borate glasses. For all three glass series it is shown that T-g strongly decreases whereas the liquid fragility strongly increases upon the addition of water. These findings reveal that H2O primarily causes breaking of B-O-B bonds rather than supporting 4-fold coordinated boron as it is well-known for alkali oxides in this concentration range. (C) 2015 Elsevier B.V. All rights reserved.