RT Journal Article
T1 Low thermal conductivity in La-filled cobalt antimonide skutterudites with an inhomogeneous filling factor prepared under high-pressure conditions
A1 Serrano-Sánchez, Federico
A1 Prado Gonjal, Jesús de la Paz
A1 Nemes, Norbert Marcel
A1 Biskup Zaja, Nevenko
A1 Varela Del Arco, María
A1 Dura, Oscar Juan
A1 Martínez, José
A1 Fernández-Díaz, Maria Teresa
A1 Fauth, François
A1 Alonso, José Antonio
AB La-filled skutterudites LaxCo4Sb12 (x = 0.25 and 0.5) have been synthesized and sintered in one step under high-pressure conditions at 3.5 GPa in a piston-cylinder hydrostatic press. The structural properties of the reaction products were characterized by synchrotron X-ray powder diffraction, clearly showing an uneven filling factor of the skutterudite phases, confirmed by transmission electron microscopy. The non-homogeneous distribution of La filling atoms is adequate to produce a significant decrease in lattice thermal conductivity, mainly due to strain field scattering of high-energy phonons. Furthermore, the lanthanum filler primarily acts as an Einstein-like vibrational mode having a strong impact on the phonon scattering. Extra-low thermal conductivity values of 2.39 W m−1 K−1 and 1.30 W m−1 K−1 are measured for La0.25Co4Sb12 and La0.5Co4Sb12 nominal compositions at 780 K, respectively. Besides this, lanthanum atoms have contributed to increase the charge carrier concentration in the samples. In the case of La0.25Co4Sb12, there is an enhancement of the power factor and an improvement of the thermoelectric properties.
PB Royal Society of Chemistry
SN 2050-7488
YR 2018
FD 2018
LK https://hdl.handle.net/20.500.14352/94069
UL https://hdl.handle.net/20.500.14352/94069
LA eng
NO Serrano-Sánchez, F., et al. «Low Thermal Conductivity in La-Filled Cobalt Antimonide Skutterudites with an Inhomogeneous Filling Factor Prepared under High-Pressure Conditions». Journal of Materials Chemistry A, vol. 6, n.o 1, 2018, pp. 118-26.  https://doi.org/10.1039/C7TA08545A.
DS Docta Complutense
RD 4 abr 2025