Thermal conductivity of thermoelectric material beta-Cu2Se: Implications on phonon thermal transport
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Thermal conductivity of thermoelectric material beta-Cu2Se: Implications on phonon thermal transport
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| Creator |
Namsani, Sadanandam
Auluck, Sushil Singh, Jayant K. |
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| Subject |
Applied Physics/Condensed Matter
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| Description |
Thermal transport properties associated with the thermal structure evolution of beta-Cu2Se are studied using density functional theory (DFT) and molecular dynamics (MD) simulations. Thermal conductivity of beta-Cu2Se is calculated over a temperature range of 400-1000K using reverse non-equilibrium molecular dynamics simulations. The thermal conductivity found through MD simulations decreases monotonically with increasing temperature, which is in line with the reported experimental data and our calculated DFT data. The average phonon mean free path evaluated using the kinetic theory, found to be within the range of 1.0-1.5 angstrom, decreases with increasing temperature. Furthermore, we have investigated the temperature-dependent heat transport phenomena using phonon density of states, calculated using MD simulations. The phonon modes are found to shift towards the low frequency numbers with increasing temperature, indicating lower heat carrying capacity of the material and in agreement with the computed thermal conductivity. Published by AIP Publishing.
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| Publisher |
American Institute of Physics
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| Date |
2017-10-16
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2913/1/Thermal%20conductivity%20of%20thermoelectric%20material%20Implications%20on%20phonon%20thermal%20transport.pdf
Namsani, Sadanandam and Auluck, Sushil and Singh, Jayant K. (2017) Thermal conductivity of thermoelectric material beta-Cu2Se: Implications on phonon thermal transport. Applied Physics Letters, 111 (16390). ISSN 0003-6951 |
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| Relation |
http://npl.csircentral.net/2913/
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