Reaction mechanism and thermoelectric properties of In0·22Co4Sb12 prepared by magnesiothermy
作者： S. Le Tonquesse , É. Alleno , V. Demange , C. Prestipino , O. Rouleau
DOI: 10.1016/J.MTCHEM.2019.100223
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摘要: Abstract The magnesioreduction synthesis of In0·22Co4Sb12 with high In rattler concentration from Sb2O4 and In-doped Co3O4 precursors is reported. This process directly yields a submicronic powder in single step 96 h at 810 K. reaction mechanism has been investigated by stopping the every 12 h quantifying existing phases X-ray diffraction Rietveld refinements. are first reduced CoO Sb2O3 lower oxides, then form CoSb2O6 CoSb2O4 intermediates which finally InxCo4Sb12. A 350 nm average size mostly composed In-filled skutterudite phase composition close to In0·17Co4Sb12 obtained. Upon spark plasma sintering, small residual amount InSb reacts matrix single-phase densified pellet In0·22Co4Sb12. resulting material 1.8 μm grain shows figure merit ZTmax 0.95 at 750 K.
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