Determination of complex-specific heat and fragility of sodium borate glasses by temperature-modulated DSC

Fukawa, Yasuteru; Matsuda, Yu; Kawashima, Mitsuru; Kojima, Seiji

doi:10.1007/s10973-009-0522-5

Cited by 11 publications

(13 citation statements)

References 18 publications

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“…with increasing alkali composition, namely it changes from strong to fragile. In lithium and sodium borate glasses it was reported that the origin of fragility strongly correlates to the formation of the BO 4 [24,25].…”

Section: Mixed Alkali Effect On Fragilitymentioning

confidence: 99%

High temperature Brillouin scattering study on elastic properties of lithium cesium borate glasses, crystals and melts

Aramomi

Matsuda

Kojima

2014

Journal of Non-Crystalline Solids

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The mixed alkali effect on elastic properties of lithium caesium borate glasses 0.25[xLi 2 O-(1-x) Cs 2 O]-0.75B 2 O 3 was studied by Brillouin scattering. The observed mixed alkali effect on the negative deviation from linearity in the composition dependence of longitudinal modulus was discussed on the basis of the decrease of four-fold coordinated boron atoms and the increase of nonbridging oxygens. The temperature dependence of elastic properties was studied in the large temperature range from room temperature to 1500 K to clarify the differences between glasses, crystals and melts. The influence of annealing was clearly observed in LA sound velocity. Fragility was discussed using the temperature dependence of velocity.

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Section: Mixed Alkali Effect On Fragilitymentioning

confidence: 99%

High temperature Brillouin scattering study on elastic properties of lithium cesium borate glasses, crystals and melts

Aramomi

Matsuda

Kojima

2014

Journal of Non-Crystalline Solids

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“…When the temperature changes during a modulated scan, the observation time changes accordingly. According to Kojima and coworkers, the average relaxation time τ corresponds to

T_{g}^{ω}

, with τ = P /2π . To construct the Angell plot,

T_{g}^{ω}

must be normalized by T g , confirmed as the temperature at equilibrium viscosity η = 10 12 Pa s .…”

Section: Resultsmentioning

confidence: 99%

“…TM‐DSC has previously been used to determine the fragility of both chalcogenide and oxide glass‐forming systems . However, due to instrumental limitations, this has been limited to glasses with low T g (below ~550°C), and it has thus not been suitable for many high‐ T g silicate glasses of industrial importance.…”

Section: Theorymentioning

confidence: 99%

“…Instead, a technique for measuring the structural relaxation time of glasses based on specific heat capacity spectroscopy measurements was proposed in 1985, using the thermal relaxation caused by the isothermal temperature oscillations to measure the structural relaxation time. Using the frequency dependence of the peak temperature (

T_{g}^{ω}

) in the imaginary heat capacity, TM‐DSC has successfully been applied to determine m of several borate‐based glass‐forming liquids ( T g ≈ 450°C) by converting frequency into relaxation time and using the following equation,

m false(x false) = {(|, \frac{d {log}_{10} τ false(T, x false)}{d (T_{g} false(x false) / T)})}_{T = T_{g} false(x false)} .

…”

Section: Theorymentioning

confidence: 99%

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

Bechgaard

Gulbiten

Mauro

et al. 2019

Int J of Appl Glass Sci

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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.

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“…Therefore, both the heating cycles have been reported in order to show the thermal events corresponding to the samples obtained on initial polymerization as well as that for the heat-treated post cured samples. The dynamic glass transition is also studied by measuring complex heat capacity by varying the frequency of measurement [41] .…”

Section: Resultsmentioning

confidence: 99%

Study of Thermal Relaxation of Poly (HDDA-co-MMA) by Temperature Modulated DSC and Dielectric Spectroscopy

Goswami

Umarji

Madras

2013

Polymer-Plastics Technology and Engineering

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The thermal transitions in the copolymer of 1,6-hexanediol diacrylate (HDDA) and methyl methacrylate (MMA) was investigated to understand its use in microstereolithography. The glass transition temperature and the effect of interaction on this transition process was investigated by means of temperature modulated differential scanning calorimetry (TMDSC). The heat capacities were determined and PHDDA rich phases showed lower heat capacity than PMMA rich phases. The frequency dependence of glass transitions were studied by varying the modulation period of TMDSC and confirmed by dielectric relaxation spectroscopy. Vogel Fulcher Tammann Hesse (VFTH) parameters of homo and copolymers have also been reported.

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Determination of complex-specific heat and fragility of sodium borate glasses by temperature-modulated DSC

Cited by 11 publications

References 18 publications

High temperature Brillouin scattering study on elastic properties of lithium cesium borate glasses, crystals and melts

High temperature Brillouin scattering study on elastic properties of lithium cesium borate glasses, crystals and melts

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

Study of Thermal Relaxation of Poly (HDDA-co-MMA) by Temperature Modulated DSC and Dielectric Spectroscopy

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