Phonon lifetimes of the thermoelectric material sodium cobaltate
Sodium cobaltate has excellent thermoelectric properties, including low thermal conductivity. We have measured its phonon dispersion using inelastic x-ray scattering, and we find that it has well defined modes unlike a phonon glass. First-principles density-functional calculations are in excellent agreement with the data, and we identify a rattling mode. We now propose to use the better energy resolution of inelastic neutron scattering on IN8 to measure the energy line widths of selected modes as a function of temperature. This will allow us to determine the phonon lifetimes and estimate the lattice contribution to the thermal conductivity.
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GOFF Jonathan P.; ENDERLE Mechthild; PIOVANO Andrea; REFSON Keith and VONESHEN David. (2013). Phonon lifetimes of the thermoelectric material sodium cobaltate. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-369
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