RT Journal Article
T1 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
A1 Gainza, Javier
A1 Serrano Sánchez, F.
A1 Prado Gonjal, Jesús de la Paz
A1 Nemes, Norbert Marcel
A1 Biskup Zaja, Nevenko
A1 Dura, O.J.
A1 Martínez, J.L.
A1 Fauth, F.
A1 Alonso, J.A.
AB 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.
PB Royal Society of Chemistry
SN 2050-7526
YR 2019
FD 2019-04-14
LK https://hdl.handle.net/20.500.14352/104550
UL https://hdl.handle.net/20.500.14352/104550
LA eng
NO 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.
NO Juan de la Cierva fellowship
NO Ministerio de Economia y Competitividad (España)
NO Ministerio de Ciencia e Innovación (España)
NO Agencia Estatal deInvestigación (España)
NO Comunidad de Madrid
NO European Commission
DS Docta Complutense
RD 9 abr 2025