Low temperature specific heat and fragility of glasses

Zhu, Da‐Ming; Chen, Huiwei

doi:10.1016/s0022-3093(97)00457-2

Cited by 10 publications

(10 citation statements)

References 49 publications

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“…18 Therefore, the observation of T max at about 17 K in c p / T 3 may be associated with the almost unnoticeable plateau for the thermal conductivity data in our LSCAS glass. In the case of the soda lime, as already shown in the literature, the plateau is more pronounced and T max occurs around 12 K. 23 Therefore, our results indicate that T max observed at higher temperatures ͑about 17 K͒ for LSCAS as compared to the soda lime ͑12 K͒ may be the possible explanation for the differences in the temperature dependence of D͑T͒ between the two glasses. Another information that can be retrieved from these results is the ratio between T max and the Debye temperature ⌰ D of the material, which some authors have used to try to connect the glass properties at low temperatures to its structural fragility.…”

Section: Resultssupporting

confidence: 83%

“…4͒ it is possible to identify the peak temperature T max at about 17 K. This maximum in c p / T 3 in glasses is correlated to what is called in the literature as the boson peak. 22,23 The term boson peak for glasses is currently used to nominate the broad, asymmetric to the high energy side and almost universal behavior of the intensities of incoherent neutron scattering and light scattering ͑the dispersion spectra͒ observed in these materials. 22 This denomination comes from the similarity between the mentioned shape of the dispersion spectra intensities scaled with temperature and that obtained for systems that obey the Bose-Einstein statistics.…”

Section: Resultsmentioning

confidence: 99%

“…Another information that can be retrieved from these results is the ratio between T max and the Debye temperature ⌰ D of the material, which some authors have used to try to connect the glass properties at low temperatures to its structural fragility. [23][24][25] Accordingly to Granato, 24,25 the dynamic and thermodynamic properties of a glass are governed by a few percent of interstitial-like defects in the material. With this hypothesis the author predicted that the low temperature specific heat of glasses should have a maximum in c p / T 3 peaked at temperatures of about ⌰ D / 35.…”

Section: Resultsmentioning

confidence: 99%

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Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K

et al. 2005

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In this work the time resolved thermal lens spectrometry was applied to measure the absolute values of the thermo-optical properties of low silica calcium aluminosilicate and soda lime glasses at low temperatures, in the range between 20 and 300 K. The thermal relaxation calorimetry was used as a complementary technique to determine the specific heat. The results showed a marked decrease of the thermal diffusivity with the temperature rise, with a dependence similar to that of the mean free path ͑ϳT −1 ͒ in the interval between 20 and 70 K, while in the range between 70 and 300 K the dependence was T −͑0.33±0.02͒. The marked variation of the temperature coefficient of the optical path length change with the temperature rise was attributed to the increase in the coefficient of the electronic polarizability. The results also showed that for the aluminosilicate glass the excess in the specific heat correlated to the so-called boson peak occurred at about 17 K, higher than that of soda lime, which occurs at about 12 K. In conclusion, our results showed the ability of the time resolved thermal lens to determine the thermo-optical properties of glasses at low temperatures, bringing possibilities for experiments in a wide range of optical materials.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K

et al. 2005

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“…On the contrary, the maxima of the corresponding crystalline states [22,24,25] take place at higher reduced temperatures (T max /θ D ∼ 1/25 for these alcohols), as it seems always be the case (see Fig. 3 [20]. So, it may well be that the exact T max /θ D ratio could somewhat depend on the kind of glass, what is not in conflict with the interstitialcy model [34], but for a given "system", fixing some secondary parameters, the boson peak and Debye temperatures seems to be clearly correlated.…”

Section: Discussionmentioning

confidence: 89%

“…In addition to these phenomenological models, other recent approaches [16,17,18,19,20] have focused on suggesting general scalings, correlations or universalities in the low-temperature properties of glasses which could hint at their microscopic origin.…”

Section: Introductionmentioning

confidence: 99%

The Boson peak in structural and orientational glasses of simple alcohols: specific heat at low temperatures

Ramos

Talón

Vieira

2002

Journal of Non-Crystalline Solids

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We review in this work specific-heat experiments, that we have conducted on different hydrogen-bonded glasses during last years. Specifically, we have measured the lowtemperature specific heat C p for a set of glassy alcohols: normal and fully-deuterated ethanol, 1-and 2-propanol, and glycerol. Ethanol exhibits a very interesting polymorphism presenting three different solid phases at low temperature: a fully-ordered (monoclinic) crystal, an orientationally-disordered (cubic) crystal or 'orientational glass', and the ordinary structural glass. By measuring and comparing the low-temperature specific heat of the three phases, in the 'boson peak' range 2-10 K as well as in the tunneling-states range below 1K, we are able to provide a quantitative confirmation that "glassy behavior" is not an exclusive property of amorphous solids. On the other hand, propanol is the simplest monoalcohol with two different stereoisomers (1-and 2-propanol), what allows us to study directly the influence of the spatial rearrangement of atoms on the universal properties of glasses. We have measured the specific heat of both isomers, finding a noteworthy quantitative difference between them.Finally, low-temperature specific-heat data of glassy glycerol have also been obtained. Here we propose a simple method based upon the soft-potential model to analyze low-temperature specific-heat measurements, and we use this method for a quantitative comparison of all these data of glassy alcohols and as a stringent test of several universal correlations and scaling laws suggested in the literature. In particular, we find that the interstitialcy model for the boson peak [A. V. Granato, Phys. Rev. Lett. 68 (1992) 974] gives a very good account of the temperature T max at which the maximum in C p /T 3 occurs.

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Phonons and Vibrational Spectrum

Zaccone

2023

Lecture Notes in Physics

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Low temperature specific heat and fragility of glasses

Cited by 10 publications

References 49 publications

Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K

Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K

The Boson peak in structural and orientational glasses of simple alcohols: specific heat at low temperatures

Phonons and Vibrational Spectrum

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