Upon filling, caged compounds like skutterudites can have their lattice thermal conductivity reduced by 4∼5 times compared with unfilled structures [1]. Recently, it was found that the thermal conductivity in Bi2Te3/Sb2Te3 superlattice structure is also greatly reduced, even comparing with its corresponding alloy, in the cross-plane direction [2]. A fundamental understanding of thermal conductivity reduction in these structures is important due to their enhanced thermoelectric figure of merit. For filled skutterudites, “phonon-glass-electron-crystal (PGEC)” scheme was adopted to describe the role of guest atoms in the cages constructed by host atoms [3]. The localized and incoherent “rattling” behavior of guest atoms cuts down the mean free path of phonons, which results in reduced lattice thermal conductivity. In this study we apply ultrafast time resolved measurement technique to study coherent phonons in Bi2Te3/Sb2Te3 superlattice and coherent vibrations in misch metal filled skutterudites, aim to reveal the mechanisms behind thermal conductivity reduction.
Skip Nav Destination
ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
July 19–23, 2009
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4357-4
PROCEEDINGS PAPER
Investigation of Phonon Scattering and Thermal Conductivity Reduction in Thermoelectric Materials Using Ultrafast Time-Resolved Optical Measurements Available to Purchase
Yaguo Wang,
Yaguo Wang
Purdue University, West Lafayette, IN
Search for other works by this author on:
Xianfan Xu
Xianfan Xu
Purdue University, West Lafayette, IN
Search for other works by this author on:
Yaguo Wang
Purdue University, West Lafayette, IN
Xianfan Xu
Purdue University, West Lafayette, IN
Paper No:
HT2009-88210, pp. 159-161; 3 pages
Published Online:
March 12, 2010
Citation
Wang, Y, & Xu, X. "Investigation of Phonon Scattering and Thermal Conductivity Reduction in Thermoelectric Materials Using Ultrafast Time-Resolved Optical Measurements." Proceedings of the ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. Volume 2: Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Computational Heat Transfer. San Francisco, California, USA. July 19–23, 2009. pp. 159-161. ASME. https://doi.org/10.1115/HT2009-88210
Download citation file:
12
Views
Related Proceedings Papers
Related Articles
Electron and Phonon Thermal Conduction in Epitaxial High- T c Superconducting Films
J. Heat Transfer (February,1993)
Tuning Phonon Transport: From Interfaces to Nanostructures
J. Heat Transfer (June,2013)
Size Effects on Nonequilibrium Laser Heating of Metal Films
J. Heat Transfer (November,1993)
Related Chapters
Study on Load Position Switching of Radial Scattering Dispenser
International Conference on Mechanical Engineering and Technology (ICMET-London 2011)
Model and Simulation of Low Elevation Ground-to-Air Fading Channel
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
Scattering of Out-Plane Line Source Load by a Shallow-Embedded Circular Lining Structure and the Ground Motion
Geological Engineering: Proceedings of the 1 st International Conference (ICGE 2007)