Lattice dynamics in liquid-like thermoelectric material Ag8GeSe6
In thermoelectric (TE) materials research, a low lattice thermal conductivity is indispensable for high material performance. To this end, the liquid-like materials hold great promise. In this project we focus on Argyrodites with the composition Ag8GeSe6, a family of liquid-like TE materials. Our preliminary study [5] showed that the lattice thermal conductivities are below the amorphous limit despite the well-documented crystallinity; particularly, an unusual low temperature peak of lattice thermal conductivity is observed at T ~ 7 K, which might be attributed to strong anharmonic interactions between the heat carrying long wavelength acoustic phonons and the low-lying optical modes. Therefore, we propose to investigate the phonon density-of-states via inelastic neutron scattering in order to derive a coherent multi-scale understanding of lattice dynamics and heat conduction, with the emphases on the phonon mean free path in spatial domain and the phonon life time in temporal domain. The results emanated from this project will not only enrich our knowledge on heat conduction at large but also facilitate developing novel TE materials beyond the class of semiconductors.
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Xingchen Shen; FAK Bjorn; KOZA Michael Marek and WEBER Frank. (2021). Lattice dynamics in liquid-like thermoelectric material Ag8GeSe6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-541
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