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- W2041533096 abstract "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." @default.
- W2041533096 created "2016-06-24" @default.
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- W2041533096 date "2009-01-01" @default.
- W2041533096 modified "2023-09-27" @default.
- W2041533096 title "Investigation of Phonon Scattering and Thermal Conductivity Reduction in Thermoelectric Materials Using Ultrafast Time-Resolved Optical Measurements" @default.
- W2041533096 doi "https://doi.org/10.1115/ht2009-88210" @default.
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