Liquid fragility determination of oxide glass‐formers using temperature‐modulated DSC

Tobias Bechgaard, Ozgur Gulbiten, John C. Mauro, Yuanzheng Yue, Mathieu Bauchy, Morten Mattrup Smedskjær

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
TidsskriftInternational Journal of Applied Glass Science
Vol/bind10
Udgave nummer3
Sider (fra-til)321-329
Antal sider9
ISSN2041-1286
DOI
StatusUdgivet - jul. 2019

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  • Projekter

    Fundamentals of Glass Relaxation

    Smedskjær, M. M. & Bechgaard, T.

    01/10/201530/09/2018

    Projekter: ProjektForskning

    Citationsformater