Inelastic neutron scattering study of the lattice dynamics of the tetrahedrite compounds Cu12Sb2Te2S13 and Cu10Te4S13
The search for efficient thermoelectric compounds has witnessed a resurgence of interest over the last two decades. These materials should meet two conflicting requirements: the thermal transport should mimic that of a glass while the electrical properties should be those of crystalline solids. One possible strategy resides in choosing materials which show intrinsically low thermal conductivity values. Natural minerals known as tetrahedrite show thermal conductivity values close to the amorphous limit i.e. when the phonon mean free path is reduced to the interatomic distances. We recently initiated a study on the Cu12Sb4-xTexS13 system with the aim at tuning the thermoelectric properties through varying the Te concentration. Preliminary results show that this is indeed the case opening up new possibilities to reach higher thermoelectric efficiency. In this context, we would like to investigate the lattice dynamics of these compounds via inelastic neutron scattering experiments to shed light on the origin of their poor ability to conduct heat.
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CANDOLFI Christophe; BOUYRIE Yohan; KOZA Michael Marek; LENOIR Bertrand and PAILHES Stephane. (2014). Inelastic neutron scattering study of the lattice dynamics of the tetrahedrite compounds Cu12Sb2Te2S13 and Cu10Te4S13. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-398
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