Mesostructured thermoelectric Co1−yMySb3 (M = Ni, Pd) skutterudites - Université de Lorraine Access content directly
Journal Articles Journal of Alloys and Compounds Year : 2017

Mesostructured thermoelectric Co1−yMySb3 (M = Ni, Pd) skutterudites

Abstract

n-type skutterudites Co0.97Pd0.03Sb3 + nano-CeO2 and Co0.94Ni0.06Sb3 + nano-CeO2 nanocomposites were synthesized by ball milling and spark plasma sintering in order to promote phonon scattering at the grain boundaries. Addition of nano-CeO2 slows down the grain size growth of the skutterudite matrix which occurs during sintering, leading to grain sizes as small as respectively 220 and 170 nm in Co0.97Pd0.03Sb3 + 2% CeO2 and Co0.94Ni0.06Sb3 + 3% CeO2. Subsequently, the lattice thermal conductivity is reduced by up to 47% at 300 K. An experimental value of ~110 nm can be estimated for the bulk phonon mean free path in both compounds. In Co0.94Ni0.06Sb3 + 3% CeO2, an improved ZT (~0.7) is obtained at 700 K. Annealing Co0.97Pd0.03Sb3 + 2% CeO2 at 825 K leads to a slightly increased grain size (240 nm), which remains stable on a long term (95 days).
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Dates and versions

hal-03984563 , version 1 (12-02-2023)

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Cite

E Alleno, E. Zehani, M. Gaborit, V. Orodniichuk, Bertrand Lenoir, et al.. Mesostructured thermoelectric Co1−yMySb3 (M = Ni, Pd) skutterudites. Journal of Alloys and Compounds, 2017, 692, pp.676-686. ⟨10.1016/j.jallcom.2016.09.094⟩. ⟨hal-03984563⟩
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