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Abstract
Glass-forming liquids exhibit a pronounced diversity in the viscosity-temperature relation. This has been characterized by the liquid fragility index to quantify the extent of the non-Arrhenian flow. Precise and accurate determination of liquid fragility is important for understanding a range of phenomena and controlling industrial glass melting processes. In this study, we use temperature-modulated differential scanning calorimetry (TM-DSC) to determine liquid fragility of a wide range of oxide compositions, including tellurites, borates, and silicates. We compare our fragility data to those determined using viscometry and the Moynihan DSC approach. We find that TM-DSC is a useful method for determination of fragility, as it exhibits higher sensitivity and provides an easier and more reliable determination of characteristic temperatures compared to the Moynihan approach. Moreover, TM-DSC is faster and requires smaller sample volume compared to the viscometric approach. However, we also observe that TM-DSC tends to either overestimate or underestimate the fragility of very strong and highly fragile compositions, respectively.
Originalsprog | Engelsk |
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Tidsskrift | International Journal of Applied Glass Science |
Vol/bind | 10 |
Udgave nummer | 3 |
Sider (fra-til) | 321-329 |
Antal sider | 9 |
ISSN | 2041-1286 |
DOI | |
Status | Udgivet - jul. 2019 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Liquid fragility determination of oxide glass‐formers using temperature‐modulated DSC'. Sammen danner de et unikt fingeraftryk.Projekter
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Fundamentals of Glass Relaxation
Smedskjær, M. M. & Bechgaard, T.
01/10/2015 → 30/09/2018
Projekter: Projekt › Forskning