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- Title
An anomaly in the glass transition width trends of alkali borate glasses at low modifier loadings.
- Authors
DeCeanne, A.; Potter, A.; Richter, K.; Starkenburg, D.; Perez, B.; Munhollon, T.; Barnes, N.; Troendle, E.; Flynn, C.; Affatigato, M.; Feller, S.; Zanotto, E.; Pietl, O.
- Abstract
The glass transition onset temperature (Tg), the glass transition end temperature (Te), and the glass transition width (ΔTg) of alkali borate glasses were determined using differential scanning calorimetry (using the definition ΔTg≡Te-Tg). An anomaly was found in ΔTg trends of the lighter alkali modifiers, with that of lithium being the most prominent. From R=0·03 to 0·10, where R is the molar ratio of alkali oxide to boron oxide, ΔTg values of the lithium family experience a large increase, maximizing at R=0·05. Those of the sodium family experience a smaller increase. After R=0·10, the trends of all alkali borates follow a similar monotonic decline. An explanation based on thermodynamic modelling of the borate species, as well as viscosity, is proposed.
- Subjects
BORATE glass; GLASS transition temperature; DYNAMIC testing of materials
- Publication
Physics & Chemistry of Glasses: European Journal of Glass Science & Technology Part B, 2017, Vol 58, Issue 5, p187
- ISSN
1753-3562
- Publication type
Article
- DOI
10.13036/17533562.58.5.004