Substantial thermal conductivity reduction in mischmetal skutterudites Mm_xCo_4Sb_12 prepared under high-pressure conditions, due to uneven distribution of the rare-earth elements

Gainza, Javier; Serrano Sánchez, F.; Prado Gonjal, Jesús De La Paz; Nemes, Norbert Marcel; Biskup Zaja, Nevenko; Dura, O.J.; Martínez, J.L.; Fauth, F.; Alonso, J.A.

Substantial thermal conductivity reduction in mischmetal skutterudites Mm_xCo_4Sb_12 prepared under high-pressure conditions, due to uneven distribution of the rare-earth elements

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JMChemistry C 7(14)_Substancial.pdf (3.44 MB)

Official URL

http://doi.org/10.1039/c8tc06461j

Publication date

2019

Authors

Gainza, Javier

Serrano Sánchez, F.

Prado Gonjal, Jesús De La Paz

Nemes, Norbert Marcel

Publisher

Royal Society of Chemistry

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URI

https://hdl.handle.net/20.500.14352/104550

Citation

J. Gainza, F. Serrano-Sánchez, J. Prado-Gonjal, N. M. Nemes, N. Biskup, O. J. Dura, J. L. Martínez, F. Fauth and J. A. Alonso, J. Mater. Chem. C, 2019, 7, 4124–4131.

Abstract

Thermoelectric mischmetal-filled Mm(x)Co(4)Sb(12) (Mm: natural cocktail of rare-earth elements, mostly Ce and La) skutterudites have been synthesized and sintered in one step under high-pressure conditions at 3.5 GPa in a piston-cylinder hydrostatic press. Synchrotron X-ray diffraction patterns display a splitting of the diffraction peaks ascribed to purely Ce-, and Mm-filled skutterudite phases, which have been analyzed and confirmed by high-resolution TEM and EELS. A total thermal conductivity () of 1.51 W m(-1) K-1 is measured at 773 K for Mm(0.5)Co(4)Sb(12), below that of other filled skutterudites, which is promoted by the enhanced phonon scattering over a broad range of the phonon spectrum due to the inhomogeneous and nanoscale mischmetal inclusion. Compared to undoped CoSb3 skutterudite synthesized by conventional methods, is reduced by a factor of 3, while the power factor is also substantially enhanced.

Description

Juan de la Cierva fellowship