2022
DOI: 10.1002/pssr.202200217
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Significant Anharmonicity of Thermal Transport in Amorphous Silica at High Temperature

Abstract: The anharmonicity of thermal transport in amorphous solids is underappreciated and inadequately understood, although considerable attention is paid to that of crystals. Herein, the anharmonic effects on the heat conduction of amorphous silica are investigated by combining the normal mode decomposition method with the Wigner transport equation. The existence of significant anharmonicity in amorphous silica, including temperature‐dependent linewidths and frequency shifts of the vibrational modes, is demonstrated… Show more

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Cited by 5 publications
(2 citation statements)
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“…Figure 13 also shows that first-principles and GAP calculations yield more precise estimates of the specific heat compared to the BKS and Tersoff potentials (the latter has been recently employed in ref. 114 to study the thermal properties of v -SiO 2 ).
Fig.
…”
Section: Methodsmentioning
confidence: 99%
“…Figure 13 also shows that first-principles and GAP calculations yield more precise estimates of the specific heat compared to the BKS and Tersoff potentials (the latter has been recently employed in ref. 114 to study the thermal properties of v -SiO 2 ).
Fig.
…”
Section: Methodsmentioning
confidence: 99%
“…It should be kept in mind that phase 2 features a temperature transient characterized by a very rapid increase (decay) from T 1 (T 2 ) to the target T (300 K in our case). For this reason, within phase 2, T 1 and T 2 are by no means equilibrium temperatures, thereby ruling out any undesirable effect due to a dependence on T of the thermal conductivity [35,36].…”
Section: B Thermal Conductivity: the Aemd Methodsmentioning
confidence: 99%