Thermal transport in silicate glasses. I. Localized phonons

Dixon, G. S.; Gault, Brent D.; Shi, Shuyun; Watson, Patricia A.; Wicksted, James P.

doi:10.1103/physrevb.49.257

Cited by 15 publications

(4 citation statements)

References 13 publications

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“…Yet, the fractal nature of the localized phonons not being evident, later various models have been developed considering Euclidean nature of the localized modes. 31 The TAH model assumes that the phonon spectrum contains low-energy extended phonons and high-energy localized phonons separated by a minimum characteristic frequency x c called the phonon mobility edge. Anharmonic coupling with extended phonons is also a prerequisite for this model.…”

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confidence: 99%

Heat conduction in conducting polyaniline nanofibers

et al. 2013

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Thermal conductivity and specific heat of conducting polyaniline nanofibers are measured to identify the nature of heat carrying modes combined with their inhomogeneous structure. The low temperature thermal conductivity results reveal crystalline nature while the high temperature data confirm the amorphous nature of the material suggesting heterogeneous model for conducting polyaniline. Extended acoustic phonons dominate the low temperature (<100 K) heat conduction, while localized optical phonons hopping, assisted by the extended acoustic modes, account for the high temperature (>100 K) heat conduction. V

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confidence: 99%

Heat conduction in conducting polyaniline nanofibers

et al. 2013

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“…It is not clear, if both anomalies are related [4]. The boson peak refers to an excess contribution to the usual Debye density of states (DOS) at low frequencies [5][6][7][8][9][10]. In silicate and germanate glasses, for example, the boson peak frequency ω peak was reported between 4.5 and 13.5 THz, about 16 − 40 times below the upper band edge ω E [8,9].…”

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confidence: 99%

“…The boson peak refers to an excess contribution to the usual Debye density of states (DOS) at low frequencies [5][6][7][8][9][10]. In silicate and germanate glasses, for example, the boson peak frequency ω peak was reported between 4.5 and 13.5 THz, about 16 − 40 times below the upper band edge ω E [8,9]. In silicate glasses [4,5,10] and polybutadiene and polysterene glasses [10], the peaks occur at frequencies about 4 − 9 times smaller than the corresponding Debye frequency ω D .…”

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confidence: 99%

Excess modes in the vibrational spectrum of disordered systems and the boson peak

2001

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We study a disordered vibrational model system, where the spring constants k are chosen from a distribution P(k)ϰ1/k above a cut-off value k min Ͼ0. We can motivate this distribution by the presence of free volume in glassy materials. We show that the model system reproduces several important features of the boson peak in real glasses: ͑i͒ a low-frequency excess contribution to the Debye density of states, ͑ii͒ the hump of the specific heat c V (T) including the power-law relation between height and position of the hump, and ͑iii͒ the transition to localized modes well above the boson peak frequency.

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“…Phonons are dominating in thermal transport process both for glass 28,29 and carbon nanotubes. 30 Moreover, above room temperature the mechanism is fully controlled by the localized phonons in glass.…”

Section: Role Of Phonons In Thermal Conductionmentioning

confidence: 99%

Improved thermal properties of borosilicate glass composite containing single walled carbon nanotube bundles

Ghosh

Mukherjee

et al. 2015

RSC Adv.

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A single walled carbon nanotube (SWCNT) incorporated borosilicate glass composite was fabricated by a melt quench technique. The thermal diffusivity, specific heat and the thermal conductivity of the base glass and the composite were determined together with their temperature profile. Enhancement of the diffusivity and the conductivity in the composite was found compared to that of the base glass. The interfacial thermal resistance (R k ) plays a decisive role in the thermal transport properties of the composite. Furthermore, the effect of phonons was discussed to substantiate the transport mechanism and the temperature profile of different thermal parameters.

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Thermal transport in silicate glasses. I. Localized phonons

Cited by 15 publications

References 13 publications

Heat conduction in conducting polyaniline nanofibers

Heat conduction in conducting polyaniline nanofibers

Excess modes in the vibrational spectrum of disordered systems and the boson peak

Improved thermal properties of borosilicate glass composite containing single walled carbon nanotube bundles

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