Thermal conductivity of amorphous materials above the plateau

Jagannathan, Ashok; Orbach, Raymond Lee; Entin‐Wohlman, O.

doi:10.1103/physrevb.39.13465

Cited by 128 publications

(61 citation statements)

References 30 publications

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“…The temperature dependence of the thermal conductivity in the solid phases of deuterated alcohol is rationalized assuming that it is given by a sum of two contributions [22][23][24][25][26][27][28][29]:…”

Section: Interpretation Of Experimental Resultsmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

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The thermal conductivity κ(T) of pure deuterated ethanol has been measured under its equilibrium vapor pressure in its orientationally-ordered crystal (T = 2 K -T m ), orientational glass and the glass state (T = 2 K -T g , T g is the glass transition temperature) solid phases. The temperature dependence of the conductivity is well described by a sum of two contributions: κ(T) = κ I (T) + κ II (T), where κ I (T) account for the heat transport by acoustic phonons and κ II (T) for the heat transfer by localized high-frequency excitations respectively. The thermal conductivities of deuterated and hydrogenated ethanols are compared in different phases. The phonon scattering mechanisms in the glasses have been analyzed. In the investigated glasses the effect of complete deuteration shows up as a contribution κ II (T).

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Section: Interpretation Of Experimental Resultsmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

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“…Thermal conductivity of methanol-H 2 O sample crystallized at T > 121 K coincides, within the experimental error, with k(T) of the sample prepared by crystallizing the pure methanol at T » Ò m . The behavior of k(T) of the methanol glass is similar to that of the glasses of ethanol and 1-propanol [14,15] The temperature dependence of the thermal conductivity of the orientationally-ordered phase and glass state can be interpreted assuming that k(T) consists of two components [22][23][24][25][26][27][28][29]:…”

Section: Experiments and Discussionmentioning

confidence: 99%

Heat transfer in solid methyl alcohol

Korolyuk

Кривчиков

Sharapova

et al. 2009

Low Temperature Physics

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Thermal conductivity coefficient k(T) of two crystalline (orientationally-ordered and orientationally-disordered) phases of pure methanol (at temperatures from 2 K to T m , T m is the melting temperature), CH 3 OH + 6.6 % H 2 O glass from 2 K to T g , T g is the glass transition temperature and a supercooled liquid from T g to 120 K has been measured under equilibrium vapor pressure. The dependence k(T ) is described approximately as a sum of two contributions: k I (T) describing heat transport by acoustic phonons and k II (T) -by localized high-frequency excitations. The temperature dependences of the thermal conductivity of primary monoatomic alcohols CH 3 OH, C 2 H 5 OH, and C 3 H 7 OH in the glass state have been compared. Different mechanisms of phonon scattering in the crystalline phases and glass have been analyzed. The k II (T) has been calculated within the Cahill-Pohl model. There is an anomaly of the thermal conductivity of the glass state near T g (a smeared minimum in the k(T) -curve).

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“…This model accounts for the non-propagating nature of the modes. As pointed out by the authors of [50], fractons have been used to "obtain explicit results", but "the approach would apply to any localized vibrational states". We believe this remark is in particular true for what concerns the functional dependence in T of the relaxation times.…”

Section: Discussionmentioning

confidence: 99%

“…The theory of lattice viscosity was developed for crystals, in which case the calculation of correlation functions [48] or the sums over modes [11,49] could be carried out quite far. For glasses, only the fracton model has been pursued to the point of making analytic predictions for the acoustic linewidth [19,50]. However, the development described in [11], in particular the one leading to Eq.…”

Section: Network Viscositymentioning

confidence: 99%

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

et al. 2005

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This series discusses the origin of sound damping and dispersion in glasses. In particular, we address the relative importance of anharmonicity versus thermally activated relaxation. In this first article, Brillouin-scattering measurements of permanently densified silica glass are presented. It is found that in this case the results are compatible with a model in which damping and dispersion are only produced by the anharmonic coupling of the sound waves with thermally excited modes. The thermal relaxation time and the unrelaxed velocity are estimated.

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Thermal conductivity of amorphous materials above the plateau

Cited by 128 publications

References 30 publications

Deuteration effects in the thermal conductivity of molecular glasses

Deuteration effects in the thermal conductivity of molecular glasses

Heat transfer in solid methyl alcohol

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

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