Phonon Thermal Conductivity of the Cubic and Monoclinic Phases of Zirconia by Molecular Dynamics Simulation

Leila Momenzadeh; Irina V. Belova; Graeme E. Murch

doi:10.4028/www.scientific.net/KEM.843.110

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 843Phonon Thermal Conductivity of the Cubic and...

Phonon Thermal Conductivity of the Cubic and Monoclinic Phases of Zirconia by Molecular Dynamics Simulation

Abstract:

Zirconia has a number of remarkable properties, including a very low thermal conductivity. In this research, the phonon thermal conductivity of two phases (cubic and monoclinic) of zirconia (ZrO₂) are calculated. For this purpose, an equilibrium molecular dynamics simulation employing the Green-Kubo formalism is used. The results are presented in detail over a wide temperature range, from 100 K to 2400 K and 100 K to 1400 K for the above-mentioned structures, respectively, with a 100K temperature step. The temperature dependence of the equilibrium atomic volume demonstrated a reasonable agreement with the experimental data. Moreover, the lattice thermal conductivity was calculated by analysing the heat current autocorrelation function. The results showed that zirconia has a low thermal conductivity that is dependent on the temperature. It was also shown that the lattice thermal conductivity of the two phases of zirconia can be decomposed into three contributions due to the acoustic shortrange and long-range phonon and optical phonon modes. Finally, the results from this research are compared with the available experimental data.

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Periodical:

Key Engineering Materials (Volume 843)

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110-115

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https://doi.org/10.4028/www.scientific.net/KEM.843.110

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Online since:

May 2020

Authors:

Leila Momenzadeh*, Irina V. Belova, Graeme E. Murch

Keywords:

Green-Kubo, Molecular Dynamic Simulation, Phonon Thermal Conductivity, Zirconia

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