naa a22 4500 510802893 CHVBK 20180411083403.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-013-2487-1 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2487-1 Resonant Oscillations in Multiple-Filled Skutterudites [Elektronische Daten] [L. Guo, X. Xu, J. Salvador, G. Meisner] Partially filled skutterudites were investigated by ultrafast spectroscopy using a femtosecond laser system, which excites resonant oscillations due to the host-guest interactions. To investigate the effect of individual guest elements on phonon-mediated thermal transport, four skutterudite samples were studied: three samples partially filled with Ba, Yb, and La, respectively, and a fourth with a combination of these three elements. The spectrum of the oscillations in the transient thermoreflectance signal was analyzed by Fourier transformation. Comparison with the Raman spectra shows that different guest elements cause resonant oscillations with different frequencies, which can scatter phonons in different spectrum spans. This further demonstrates that multiple guest elements can scatter a wider spectrum of phonons than a single guest element at similar filling fractions, which results in lower lattice thermal conductivity (κ L) in skutterudites. These findings are consistent with thermal conductivity measurements reported previously. TMS, 2013 Multiple-filled skutterudite nationallicence ultrafast laser spectroscopy nationallicence resonant oscillation nationallicence phonon transport nationallicence Guo L. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, 47907, West Lafayette, IN, USA aut Xu X. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, 47907, West Lafayette, IN, USA aut Salvador J. Chemical and Materials Systems Laboratory, GM Global R&D, 48090, Warren, MI, USA aut Meisner G. Chemical and Materials Systems Laboratory, GM Global R&D, 48090, Warren, MI, USA aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1978-1981 0361-5235 42:7<1978 2013 42 11664 https://doi.org/10.1007/s11664-013-2487-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2487-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guo L. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Xu X. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Salvador J. Chemical and Materials Systems Laboratory, GM Global R&D, 48090, Warren, MI, USA aut NATIONALLICENCE 700 1- Meisner G. Chemical and Materials Systems Laboratory, GM Global R&D, 48090, Warren, MI, USA aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1978-1981 0361-5235 42:7<1978 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer