A continuum model reproducing the multiple frequency crossovers in acoustic attenuation in glasses

Luo, Haoming; Giordano, Valentina M.; Gravouil, Anthony; Tanguy, Anne

doi:10.1016/j.jnoncrysol.2022.121472

Cited by 2 publications

(3 citation statements)

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“…In the high frequency regime (above the Ioffe-Regel frequency), a scaling of the mean-free path ∝ 1/ω 2 is reported in the experimental litterature [48,89,101], but in this regime the Damped Harmonic Oscillator fits used to identify the mean-free path and the acoustic attenuation are no longer valid [47,62,101]. As shown before, the mean-free path indeed becomes ill-defined in this frequency range.…”

Section: Harmonic Wave-packets Contribution To the Thermal Conductivi...mentioning

confidence: 84%

“…Temporal correlations infered from the measurements of the dynamical structure factors in the supercooled liquid (above the glass transition and below the melting temperature) highlighted two kinds of high-temperature relaxation processes: a fast β-relaxation and a slower streched exponential α-relaxation that could be related to a hierarchy or at least to a large distribution of relaxation times [43]. In the glassy state, below the glass transition temperature, acoustic attenuation follows different frequency laws, interpreted as weak to strong acoustic scattering on the elastic heterogeneities [6,26,[44][45][46][47][48][49], completed by thermal sensitive anharmonic processes that may become dominants in the low frequency regime [27,[50][51][52][53]. The temperature dependence of the thermal conductivity is an example of the anomalous thermal behaviour of glasses compared to crystals.…”

Section: Introductionmentioning

confidence: 99%

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Vibrations and Heat Transfer in Glasses: The Role Played by Disorder

Tanguy

2024

Comptes Rendus. Physique

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Amorphous materials are also distinguished from crystals by their thermal properties. The structural disorder seems to be responsible both for a significant increase in heat capacity compared to crystals of the same composition, but also for a significant decrease in thermal conductivity. The temperature dependence of thermal conductivity, unusual for common interpretations of solid-state physics, gave rise to a lot of debates. We review in this article different interpretations of thermal conductivity in amorphous materials. We show finally that the temperature dependence of thermal conductivity in dielectric materials can be understood by relating it to the disorder-dependent harmonic vibrational eigenmodes.Résumé. Les matériaux amorphes se distinguent aussi des cristaux par leurs propriétés thermiques. Le désordre structural semble être responsable à la fois d'une augmentation importante de la capacité calorifique par rapport aux cristaux de même composition, mais aussi d'une diminution importante de la conductivité thermique. La dépendance en température de la conductivité thermique, inhabituelle pour les interprétations usuelles de la physique du solide, a fait couler beaucoup d'encre. Nous passons en revue dans cet article différentes interprétations de la conductivité thermique dans les matériaux amorphes. Nous montrons que la dépendance en température dans les matériaux diélectriques peut aussi être comprise à l'aide de l'effet du désordre structural sur les modes propres de vibration.

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Section: Harmonic Wave-packets Contribution To the Thermal Conductivi...mentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Vibrations and Heat Transfer in Glasses: The Role Played by Disorder

Tanguy

2024

Comptes Rendus. Physique

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“…It is probably affected as well by the dispersion at the atomic scale in the Thz range. It was shown recently that an effective elasto-viscous law must be considered in this case, in place of the elastic materials behavior used in this work 60,61 .…”

Section: Discussionmentioning

confidence: 99%

Role of a fractal shape of the inclusions on acoustic attenuation in a nanocomposite

et al. 2021

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Nanophononic materials are promising to control the transport of sound in the GHz range and heat in the THz range. Here we are interested in the influence of a dendritic shape of inclusion on acoustic attenuation. We investigate a Finite Element numerical simulation of the transient propagation of an acoustic wavepacket in 2D nanophononic materials with circular or dendritic inclusions periodically distributed in matrix. By measuring the penetration length, diffusivity, and instantaneous wave velocity, we find that the multibranching tree-like form of dendrites provides a continuous source of phonon-interface scattering leading to an increasing acoustic attenuation. When the wavelength is far less than the inter-inclusion distance, we report a strong attenuation process in the dendritic case which can be fitted by a compressed exponential function with β > 1.

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A continuum model reproducing the multiple frequency crossovers in acoustic attenuation in glasses

Cited by 2 publications

References 68 publications

Vibrations and Heat Transfer in Glasses: The Role Played by Disorder

Vibrations and Heat Transfer in Glasses: The Role Played by Disorder

Role of a fractal shape of the inclusions on acoustic attenuation in a nanocomposite

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