Phonon softening and lattice thermal conductivity in high entropy alloys of SnSe thermoelectrics: temperature dependent phonon softening
Thermoelectric materials can contribute to be part of the alternative for a sustainable world, as they present the advantage of converting temperature differences into electrical power, mainly through the scavenging of waste heat with thermoelectric generators. A key limitation of thermoelectrics is their lattice thermal conductivity. Our goal is to understand and decrease the lattice contribution to the heat transport. Control of the phonon system, and phonon scattering, is crucial in improving thermoelectrics, and this is where neutrons can provide valuable insight unobtainable by other means. We will study the temperature dependent phonon spectrum of high entropy alloys based on SnSe, a recently discovered promising thermoelectric, compare with NPD and estimated phonon modes from ADP, and of unalloyed SnSe. In particular, we are interested in the tell-tale sign of the appearance of a softening low energy mode. This proposal builds on the results [13] obtained in IN6, Experiment: 7-01-508, Instrument: IN6-SHARP from 11/10/2019 to 14/10/2019. The results were published in [12] as ¿High-Performance n-type SnSe Thermoelectric Polycrystal Prepared by Arc-Melting¿ in 2020
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N. M. Nemes; ALONSO Jose Antonio; FERNANDEZ DIAZ Maria Teresa; GAINZA MARTIN Javier; KOZA Michael Marek; MARTINEZ PENA Jose Luis and SERRANO Federico. (2024). Phonon softening and lattice thermal conductivity in high entropy alloys of SnSe thermoelectrics: temperature dependent phonon softening. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-594
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