Role of phonon dispersion in studying phonon mean free paths in skutterudites
Experimental thermal conductivity of bulk materials are often modeled using Debye approximation together with functional forms of relaxation time with fitting parameters. While such models can fit the temperature dependence of thermal conductivity of bulk materials, the Debye approximation leads to...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics
2013
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| Online Access: | http://hdl.handle.net/1721.1/78284 https://orcid.org/0000-0001-8492-2261 https://orcid.org/0000-0002-3968-8530 |
| _version_ | 1826210308563140608 |
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| author | Zebarjadi, Mona Yang, Jian Lukas, Kevin Kozinsky, Boris Yu, Bo Dresselhaus, Mildred Opeil, Cyril Ren, Zhifeng Chen, Gang |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Zebarjadi, Mona Yang, Jian Lukas, Kevin Kozinsky, Boris Yu, Bo Dresselhaus, Mildred Opeil, Cyril Ren, Zhifeng Chen, Gang |
| author_sort | Zebarjadi, Mona |
| collection | MIT |
| description | Experimental thermal conductivity of bulk materials are often modeled using Debye approximation together with functional forms of relaxation time with fitting parameters. While such models can fit the temperature dependence of thermal conductivity of bulk materials, the Debye approximation leads to large error in the actual phonon mean free path, and consequently, the predictions of the thermal conductivity of the nanostructured materials using the same relaxation time are not correct even after considering additional size effect on the mean free path. We investigate phonon mean free path distribution inside fully unfilled (Co4Sb12) and fully filled (LaFe4Sb12) bulk skutterudites by fitting their thermal conductivity to analytical models which employ different phonon dispersions. We show that theoretical thermal conductivity predictions of the nanostructured samples are in agreement with the experimental data obtained for samples of different grain sizes only when the full phonon dispersion is considered. |
| first_indexed | 2024-09-23T14:47:45Z |
| format | Article |
| id | mit-1721.1/78284 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:47:45Z |
| publishDate | 2013 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/782842022-09-29T10:35:11Z Role of phonon dispersion in studying phonon mean free paths in skutterudites Zebarjadi, Mona Yang, Jian Lukas, Kevin Kozinsky, Boris Yu, Bo Dresselhaus, Mildred Opeil, Cyril Ren, Zhifeng Chen, Gang Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Physics Dresselhaus, Mildred Zebarjadi, Mona Chen, Gang Experimental thermal conductivity of bulk materials are often modeled using Debye approximation together with functional forms of relaxation time with fitting parameters. While such models can fit the temperature dependence of thermal conductivity of bulk materials, the Debye approximation leads to large error in the actual phonon mean free path, and consequently, the predictions of the thermal conductivity of the nanostructured materials using the same relaxation time are not correct even after considering additional size effect on the mean free path. We investigate phonon mean free path distribution inside fully unfilled (Co4Sb12) and fully filled (LaFe4Sb12) bulk skutterudites by fitting their thermal conductivity to analytical models which employ different phonon dispersions. We show that theoretical thermal conductivity predictions of the nanostructured samples are in agreement with the experimental data obtained for samples of different grain sizes only when the full phonon dispersion is considered. Massachusetts Institute of Technology. Energy Initiative United States. Dept. of Energy (MIT S3TEC, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science; Office of Basic Energy Sciences under Award No. DE-FG02-09ER46577) Robert Bosch GmbH 2013-04-04T16:40:35Z 2013-04-04T16:40:35Z 2012-08 2012-07 Article http://purl.org/eprint/type/JournalArticle 0021-8979 1089-7550 http://hdl.handle.net/1721.1/78284 Zebarjadi, Mona et al. “Role of Phonon Dispersion in Studying Phonon Mean Free Paths in Skutterudites.” Journal of Applied Physics 112.4 (2012): 044305. CrossRef. Web.© 2012 American Institute of Physics. https://orcid.org/0000-0001-8492-2261 https://orcid.org/0000-0002-3968-8530 en_US http://dx.doi.org/10.1063/1.4747911 Journal of Applied Physics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics MIT web domain |
| spellingShingle | Zebarjadi, Mona Yang, Jian Lukas, Kevin Kozinsky, Boris Yu, Bo Dresselhaus, Mildred Opeil, Cyril Ren, Zhifeng Chen, Gang Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title | Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title_full | Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title_fullStr | Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title_full_unstemmed | Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title_short | Role of phonon dispersion in studying phonon mean free paths in skutterudites |
| title_sort | role of phonon dispersion in studying phonon mean free paths in skutterudites |
| url | http://hdl.handle.net/1721.1/78284 https://orcid.org/0000-0001-8492-2261 https://orcid.org/0000-0002-3968-8530 |
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