Lattice Thermal Conductivity Modelling of a Diatomic Nanoscale Material

Author(s): Adil H. Awad*

Journal Name: Nanoscience & Nanotechnology-Asia

Volume 10 , Issue 5 , 2020


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Graphical Abstract:


Abstract:

Introduction: A new approach for expressing the lattice thermal conductivity of diatomic nanoscale materials is developed.

Methods: The lattice thermal conductivity of two samples of GaAs nanobeam at 4-100K is calculated on the basis of monatomic dispersion relation. Phonons are scattered by nanobeam boundaries, point defects and other phonons via normal and Umklapp processes.

Results: A comparative study of the results of the present analysis and those obtained using Callaway formula is performed. We clearly demonstrate the importance of the utilised scattering mechanisms in lattice thermal conductivity by addressing the separate role of the phonon scattering relaxation rate. The formulas derived from the correction term are also presented, and their difference from Callaway model is evident. Furthermore their percentage contribution is sufficiently small to be neglected in calculating lattice thermal conductivity.

Conclusion: Our model is successfully used to correlate the predicted lattice thermal conductivity with that of the experimental observation.

Keywords: Thermal conductivity, GaAs nanobeam, dispersion relation, diatomic nanostructure, scattering mechanisms.

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Article Details

VOLUME: 10
ISSUE: 5
Year: 2020
Page: [602 - 609]
Pages: 8
DOI: 10.2174/2210681209666190423142040
Price: $25

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