Heat transport in disordered network forming ...
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Heat transport in disordered network forming materials: Size effects and existence of propagative modes
Author(s) :
Duong, Thuy-Quynh [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Massobrio, Carlo [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Boero, Mauro [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Ori, Guido [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Martin, Évelyne [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Massobrio, Carlo [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Boero, Mauro [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Ori, Guido [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Martin, Évelyne [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Journal title :
Computational Materials Science
Pages :
109607
Publisher :
Elsevier
Publication date :
2020-05
ISSN :
0927-0256
English keyword(s) :
Thermal conductivity
Disordered materials
Nanoscale effects
Disordered materials
Nanoscale effects
HAL domain(s) :
Physique [physics]
Physique [physics]/Matière Condensée [cond-mat]
Physique [physics]/Matière Condensée [cond-mat]
English abstract : [en]
We show that in nanoscale disordered networks the thermal conductivity reduces with respect to the bulk value in a way remindful of the analogous behavior in nanocrystalline systems. Our rationale is based on the analogy ...
Show more >We show that in nanoscale disordered networks the thermal conductivity reduces with respect to the bulk value in a way remindful of the analogous behavior in nanocrystalline systems. Our rationale is based on the analogy with nanostruc-tured crystalline silicon and is substantiated by results obtained (experimen-tally, analytically and by atomic scale modelling) on crystalline Si, amorphous Si, glassy SiO 2 and glassy GeTe 4. We point out the implication of such findings on the potential performances of nanoscale heat devices. Thermal transport by conduction in non-metallic materials is due to heat carriers that either propagate with a wave vector (propagons) or that are extended but have no wave vector (diffusons) [1]. Propagons are sensitive to size reduction, diffusons are not. In crystals, the role of propagons is played by phonons travelling undisturbed without undergoing collisions (i.e. ballistically) 5 on a mean free path (MFP) until they experience a scattering (diffusive) event. In a bulk crystalline system, diffusive events are unavoidable regardless of the extent of the largest MFP. This picture changes drastically when a material has nanoscale dimensions, as in a film or a wire for example, these changes beingShow less >
Show more >We show that in nanoscale disordered networks the thermal conductivity reduces with respect to the bulk value in a way remindful of the analogous behavior in nanocrystalline systems. Our rationale is based on the analogy with nanostruc-tured crystalline silicon and is substantiated by results obtained (experimen-tally, analytically and by atomic scale modelling) on crystalline Si, amorphous Si, glassy SiO 2 and glassy GeTe 4. We point out the implication of such findings on the potential performances of nanoscale heat devices. Thermal transport by conduction in non-metallic materials is due to heat carriers that either propagate with a wave vector (propagons) or that are extended but have no wave vector (diffusons) [1]. Propagons are sensitive to size reduction, diffusons are not. In crystals, the role of propagons is played by phonons travelling undisturbed without undergoing collisions (i.e. ballistically) 5 on a mean free path (MFP) until they experience a scattering (diffusive) event. In a bulk crystalline system, diffusive events are unavoidable regardless of the extent of the largest MFP. This picture changes drastically when a material has nanoscale dimensions, as in a film or a wire for example, these changes beingShow less >
Language :
Anglais
Popular science :
Non
Source :
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