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

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. K E Y W O R D S liquid fragility, oxide glasses, temperature-modulated DSC How to cite this article: Bechgaard TK, Gulbiten O, Mauro JC, Yue Y, Bauchy M, Smedskjaer MM. Liquid fragility determination of oxide glass-formers using temperature-modulated DSC. Int J Appl Glass Sci.

Determining the fragility of bulk metallic glass forming liquids via modulated DSC

“…Applying different modulation periods to an equilibrium liquid enables us to study the temperature dependence of the system's average relaxation time and therefore its fragility. While various studies on non-metallic systems address MDSC-based fragility analysis [20,[34][35][36][37], only a sparse amount of work on metallic glass formers can be found in literature [24,38]. The present study aims to ll this gap by characterizing the low-temperature fragility of BMG forming liquids via the MDSC approach.…”

Thermal Stability of Lead-Free Transparent Cloisonné Glazes

“…As shown in Figure 4, the Tg increased gradually with increasing heating rate (β). The Tg can be estimated as a function of temperature using the Moynihan et al equation [30]: The glass transition temperature (T g ), endothermic peak temperature of the glass transition (T p ), crystallization temperature (T c ), and temperature interval between the crystallization peak and glass transition (T c -T g ) were determined from the differential scanning calorimetry (DSC) thermograms of the (70 − x) ZnO-30 B 2 O 3 -x Bi 2 O 3 glass. As shown in Figure 4, the T g increased gradually with increasing heating rate (β).…”

“…As shown in Figure 4, the T g increased gradually with increasing heating rate (β). The T g can be estimated as a function of temperature using the Moynihan et al equation [30]:…”

Fabrication of Chalcogenide Glass Based Hexagonal Gapless Microlens Arrays via Combining Femtosecond Laser Assist Chemical Etching and Precision Glass Molding Processes

“…Recently, ChG-based optical components and devices have attracted numerous researchers because of the low cost and unique properties, which include wide transmittance windows (making them suitable for both mid-infrared and long-infrared applications), high refractive indices ( n = 2.0–3.5) and strong nonlinear properties in the mid-infrared region [ 9 , 10 , 11 , 12 , 13 , 14 ]. On the contrary, germanium is rare and expensive, silicon has a nonlinear refractive index 100 or even 1000 times lower than that of a chalcogenide glass, and oxide glasses can only be used in the near- and mid-infrared wave band because of the strong infrared absorption of metal-oxygen bond vibrations [ 15 , 16 , 17 , 18 ]. Consequently, ChG-based optics are promising in many cutting-edge IR applications, such as near- to long-infrared imaging [ 19 ], biologic sensing [ 20 ], infrared photodetection [ 21 , 22 ] and infrared optical microcavity for chemical sensors [ 23 ].…”