In y Co4Sb12 Skutterudite: Phase Equilibria and Crystal Structure

Grytsiv, A.; Rogl, P.; Michor, H.; Bauer, E.; Giester, Gerald

doi:10.1007/s11664-013-2679-8

Cited by 41 publications

(39 citation statements)

References 53 publications

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“…Ad b) The In 0.4 Co 4 Sb 12 samples were synthesized from CoSb, InSb and (Sb) using In pieces (99.9 mass%; Ögussa Austria), Sb ingot (99.8 mass% metals basis; Alfa Aesar, Germany) and Co powder (99.9 mass%, particle size < 150 lm, Sigma-Aldrich, Germany) as described in detail in an earlier reference [24].…”

Section: Methodsmentioning

confidence: 99%

In-doped multifilled n-type skutterudites with ZT= 1.8

et al. 2015

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Section: Methodsmentioning

confidence: 99%

In-doped multifilled n-type skutterudites with ZT= 1.8

et al. 2015

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“…The products were then ground into fine powders, cold pressed into pellets and annealed at 973 K, in the case of the double-filled skutterudites, and 923 K, in the case of the As-substituted specimens, for 2 weeks. Additional grinding and annealing were performed in order to further promote homogeneity of the products [26,27]. After appropriate annealing, the products were again ground into fine powders and sieved to 325 mesh inside a glovebox before loading into graphite dies for hot pressing.…”

Section: Methodsmentioning

confidence: 99%

High-temperature thermoelectric properties of p-type skutterudites Ba0.15Yb x Co3FeSb12 and Yb y Co3FeSb9As3

et al. 2014

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Two series of p-type polycrystalline skutterudites, Ba 0.15 Yb x Co 3 FeSb 12 and Yb y Co 3 FeSb 9 As 3 with varying Yb concentrations, were synthesized by solid-state reaction and then densified by hot pressing. The phase and stoichiometries of the resulting materials were characterized by powder X-ray diffraction and energy dispersive spectroscopy, while their high-temperature transport properties were investigated from 300 to 800 K. The Seebeck coefficients and electrical resistivities increased linearly with increasing temperature for the double-filled specimens. The Seebeck coefficients and electrical resistivities did not change very much for the As-substituted specimens. The thermal conductivity for all specimens decreased with increasing temperature up to 700 K, corresponding to the plateau in the Seebeck coefficient, and then increased again due to bipolar diffusion. We find that double filling is a more feasible approach to thermoelectric property optimization than single filling with As substitution.

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“…After melting for 96 h and quenching the ingots were ground into fine powders by ball milling, annealed for another 96 h, and then milled again. Both melting (T m ) and annealing (T a ) temperatures were 650 [9], respectively, and formation of R y Fe 4−x Co x Sb 12 within 898-973 K [10,11]. We used also p-type precursor Mm 0.9 Fe 3 CoSb 12 nanopowders from commercial supplier (Matres scrl, Italy; Mm stands for misch-metal, a Ce:La mixture).…”

Section: Methodsmentioning

confidence: 99%

“…In principle, a 300K of filled skutterudites should obey the Vegard law, i.e. it should increase with the filling fraction linearly [8,9]. Likewise, the lattice would expand with iron content, and multiple filling should lead to further expansion of the unit cell due to variation in atomic radii of constituent elements.…”

Section: Methodsmentioning

confidence: 99%

Nanostructure Features, Phase Relationships and Thermoelectric Properties of Melt-Spun and Spark-Plasma-Sintered Skutterudites

et al. 2018

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Reduction of thermal conductivity remains a main approach relevant to enhancement of figure-of-merit of most thermoelectric materials. Melt spinning combined with spark plasma sintering appears to be a vital route towards fine-grain skutterudites with improved thermoelectric performance. However, upon high-temperature processing the Fe4−xCoxSb12-based skutterudites are prone to decompose into multiple phases, which deteriorate their thermoelectric performance. In this study we addressed the effects of combined melt spinning and spark plasma sintering on the phase composition and microstructural properties of filled Fe4−xCoxSb12 as well as their influence on thermoelectric characteristics of these compounds. The crystallites of filled Fe4−xCoxSb12 were effectively reduced to sizes below 100 nm upon melt spinning, but also severe decomposition with weakly preserved nominal phase was observed. Spark plasma sintering of melt spun skutterudites resulted in even further reduction of crystallites. Upon short annealing and sintering the n-type materials easily restored into single-phase filled CoSb3 with nanoscale features preserved, while secondary phases of FeSb2 and Sb remained in p-type compounds. Relatively high figure-of-merit ZTmax of 0.9 at T ≈ 400•

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In y Co4Sb12 Skutterudite: Phase Equilibria and Crystal Structure

Cited by 41 publications

References 53 publications

In-doped multifilled n-type skutterudites with ZT= 1.8

In-doped multifilled n-type skutterudites with ZT= 1.8

High-temperature thermoelectric properties of p-type skutterudites Ba0.15Yb x Co3FeSb12 and Yb y Co3FeSb9As3

Nanostructure Features, Phase Relationships and Thermoelectric Properties of Melt-Spun and Spark-Plasma-Sintered Skutterudites

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