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La-filled skutterudites LaxCo4Sb12 (x : 0.25 and 0.5) have been synthesizedand sintered in one step under high-pressure conditions at 3.5 GPa in apiston-cylinder hydrostatic press. The structural properties of the reactionproducts were characterized by synchrotron X-ray powder diffraction, clearlyshowing an uneven filling factor of the skutterudite phases, confirmed bytransmission electron microscopy. The non-homogeneous distribution of Lafilling atoms is adequate to produce a significant decrease in lattice thermalconductivity, mainly due to strain field scattering of high-energy phonons.Furthermore, the lanthanum filler primarily acts as an Einstein-likevibrational mode having a strong impact on the phonon scattering. Extra-lowthermal conductivity values of 2.39 W/mK and 1.30 W/mK are measured forLa0.25Co4Sb12 and La0.5Co4Sb12 nominal compositions at 780 K, respectively.Besides this, lanthanum atoms have contributed to increase the charge carrierconcentration in the samples. In the case of La0.25Co4Sb12, there is anenhancement of the power factor and an improvement of the thermoelectricproperties.

Low thermal conductivity in La-filled cobalt antimonide skutterudites with an inhomogeneous filling factor prepared under high-pressure conditions