Composition, structure and phonon softening in high entropy alloys based on PbTe thermoelectrics
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 static disorder and the phonon system (phonon scattering) is crucial to improving thermoelectrics, and this is where neutrons can provide valuable insight unobtainable by other means. We have successfully prepared high entropy alloys based on PbTe, alloyed with Sn, Sb and Se. However, SXRD and STEM-EELS alone were not sufficient to characterize the actual composition of the cubic crystalline phase. We will compare them with high resolution low temperature NPD and estimated phonon modes from temperature dependent ADPs. The latter will also complement an imminent experiment on PANTHER on the temperature dependent phonon spectrum of high entropy alloys based on PbTe. This proposal accompanies Experiment: 7-01-594, Instrument: PANTHER, near future
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The recommended format for citing this dataset in a research publication is in the following format:
N. M. Nemes; ALONSO Jose Antonio; ANDERSEN Henrik Lyder; FERNANDEZ DIAZ Maria Teresa; GAINZA MARTIN Javier; SANCHEZ DE BUSTAMANTE Lucia and SERRANO Federico. (2024). Composition, structure and phonon softening in high entropy alloys based on PbTe thermoelectrics. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1199
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