Unveiling the origin of extra-low thermal conductivity in thermoelectric R1-xCo4Sb12 skutterudites prepared under high pressures
Recently, we have found that high pressure (HP) synthesis promotes a boost in the filling fraction of filled-skutterudite thermoelectric materials, leading to a “glass-like”, ultralow thermal conductivity. This is the effect of additional scattering of high-energy phonons on the lattice thermal conductivity of caged crystals. Additionally, a thorough analysis of the temperature-dependent atomic displacement parameters (ADP) based on the Einstein model may permit to establish a direct relationship between the ADPs of the guest atom and the magnitude of the lattice thermal conductivity, as demonstrated for some filled M1-xCo4Sb12 skutterudites. We aim 1) to investigate the structural influence of the extra filling in HP skutterudites of different compositions: La0.5Co4Sb12; Ce0.5Co4Sb12, Yb0.5Co4Sb12, Mm0.5Co4Sb12 (Mm= Mischmetal: cocktail of Ce, Nd and other rare earths), Sr0.5Co4Sb12, K0.5Co4Sb12, all of them prepared at 3.5 GPa, and 2) to study the thermal evolution above RT, up to 800ºC, in order to fit the ADPs to the Einstein model. For this we ask for 4 days at D2B diffractometer.
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ALONSO Jose Antonio; FERNANDEZ DIAZ Maria Teresa; GAINZA MARTIN Javier; N. M. Nemes; Jesus Prado-Gonjal; J.E. RODRIGUES and SERRANO Federico. (2019). Unveiling the origin of extra-low thermal conductivity in thermoelectric R1-xCo4Sb12 skutterudites prepared under high pressures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1118
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