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Title: Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels

Abstract

Anisotropic thermal transport behavior was investigated in a single crystal sapphire patterned by vertically aligned few-nanometer diameter and several micrometer long cylindrical ion tracks. These ion tracks were introduced by exposing the sapphire to energetic ions of xenon accelerated to 167 MeV with fluences ranging from 1012 to 1014 ions/cm2. It was found that, in the low ion-track density regime, cross-plane thermal conductivity is larger, whereas in the high track density regime, the trend reverses and in-plane conductivity becomes larger. The crossover between these regimes is attributed to the interplay between phonon scattering with ion track boundaries and phonon confinement effects. In the low track density regime, the material is described by bulk phonon dispersion and anisotropy in thermal transport is attributed to the aligned nature of tracks that effectively reduce the mean free path of phonons traveling in the in-plane direction more than in the cross-plane direction. In the high-density regime, larger conductivity reduction in the cross-plane direction is consistent with previous observations, where the anisotropic reduction in thermal conductivity is owed to the anisotropic reduction of acoustic velocity caused by phonon confinement. Our results are further supported by an analytical model describing phonon mediated thermal transport.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Nazarbayev Univ., Nur-Sultan (Kazakhstan)
  3. Nelson Mandela Univ., Port Elizabeth (South Africa). Center for HRTEM
  4. Joint Inst. for Nuclear Research, Dubna (Russia). Flerov Lab. of Nuclear Reactions; National Research Nuclear Univ. (MEPhI), Moscow (Russia); Dubna State Univ., Dubna (Russia)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Thermal Energy Transport under Irradiation (TETI)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Kazakhstan Ministry of Education and Science; Kazakhstan Ministry of Industry and Infrastructural Development; Nazarbayev University
OSTI Identifier:
1767716
Alternate Identifier(s):
OSTI ID: 1581208
Grant/Contract Number:  
AC07-05ID14517; AP05130446; AP06851392; 110119FD4501
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; optics; phonons; thermal conductivity; nuclear; defects; magnetism and spin physics; mesoscale science; mesostructured materials; phononic crystal; interface defects; ionization processes; phonon scattering; nanocomposites; thermal transport; superlattices; radiation damage; nanochannels

Citation Formats

Chauhan, Vinay S., Abdullaev, Azat, Utegulov, Zhandos, O’Connell, Jacques, Skuratov, Vladimir, and Khafizov, Marat. Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels. United States: N. p., 2020. Web. doi:10.1063/1.5125415.
Chauhan, Vinay S., Abdullaev, Azat, Utegulov, Zhandos, O’Connell, Jacques, Skuratov, Vladimir, & Khafizov, Marat. Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels. United States. https://doi.org/10.1063/1.5125415
Chauhan, Vinay S., Abdullaev, Azat, Utegulov, Zhandos, O’Connell, Jacques, Skuratov, Vladimir, and Khafizov, Marat. Mon . "Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels". United States. https://doi.org/10.1063/1.5125415. https://www.osti.gov/servlets/purl/1767716.
@article{osti_1767716,
title = {Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels},
author = {Chauhan, Vinay S. and Abdullaev, Azat and Utegulov, Zhandos and O’Connell, Jacques and Skuratov, Vladimir and Khafizov, Marat},
abstractNote = {Anisotropic thermal transport behavior was investigated in a single crystal sapphire patterned by vertically aligned few-nanometer diameter and several micrometer long cylindrical ion tracks. These ion tracks were introduced by exposing the sapphire to energetic ions of xenon accelerated to 167 MeV with fluences ranging from 1012 to 1014 ions/cm2. It was found that, in the low ion-track density regime, cross-plane thermal conductivity is larger, whereas in the high track density regime, the trend reverses and in-plane conductivity becomes larger. The crossover between these regimes is attributed to the interplay between phonon scattering with ion track boundaries and phonon confinement effects. In the low track density regime, the material is described by bulk phonon dispersion and anisotropy in thermal transport is attributed to the aligned nature of tracks that effectively reduce the mean free path of phonons traveling in the in-plane direction more than in the cross-plane direction. In the high-density regime, larger conductivity reduction in the cross-plane direction is consistent with previous observations, where the anisotropic reduction in thermal conductivity is owed to the anisotropic reduction of acoustic velocity caused by phonon confinement. Our results are further supported by an analytical model describing phonon mediated thermal transport.},
doi = {10.1063/1.5125415},
journal = {AIP Advances},
number = 1,
volume = 10,
place = {United States},
year = {2020},
month = {1}
}

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Works referencing / citing this record:

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