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Reaction mechanism and thermoelectric properties of In0:22Co4Sb12 prepared by magnesiothermy

Abstract : The magnesioreduction synthesis of In 0.22 Co 4 Sb 12 with high In-rattler concentration from Sb 2 O 4 and In-doped Co 3 O 4 precursors is reported. This process directly yields a submicronic powder in a single step of 96 h at 810 K. The reaction mechanism has been investigated by stopping the reaction every 12 h and quantifying the existing phases by X-ray diffraction and Rietveld refinements. The precursors are first reduced in CoO and Sb 2 O 3 lower oxides, then form CoSb 2 O 6 and CoSb 2 O 4 intermediates which are finally reduced in In x Co 4 Sb 12. A powder with 350 nm average size and mostly composed of In-filled skutterudite phase with composition close to In 0.17 Co 4 Sb 12 is obtained. Upon spark plasma sintering, small residual amount of InSb reacts with the skutterudite matrix to form a single-phase densified pellet with composition close to In 0.22 Co 4 Sb 12. The resulting densified material with 1.8 µm average grain size shows a figureof-merit ZT max of 0.95 at 750 K.
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Contributor : Valérie Demange Connect in order to contact the contributor
Submitted on : Wednesday, December 9, 2020 - 11:16:02 AM
Last modification on : Wednesday, November 3, 2021 - 9:28:20 AM
Long-term archiving on: : Wednesday, March 10, 2021 - 6:51:08 PM


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Sylvain Le Tonquesse, Eric Alleno, Valérie Demange, Carmelo Prestipino, Olivier Rouleau, et al.. Reaction mechanism and thermoelectric properties of In0:22Co4Sb12 prepared by magnesiothermy. Materials Today Chemistry, Elsevier, 2020, 16, pp.100223. ⟨10.1016/j.mtchem.2019.100223⟩. ⟨hal-03048178⟩



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