Effect of rapid solidification on the synthesis and thermoelectric properties of Yb-filled Co4Sb12 skutterudite

Aversano, Francesco; Branz, Simone; Bassani, E.; Fanciulli, Carlo; Ferrario, A.; Boldrini, Stefano; Baricco, Marcello; Castellero, Alberto

doi:10.1016/j.jallcom.2019.04.337

Cited by 15 publications

(13 citation statements)

References 35 publications

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“…At low temperatures, a decreasing linear trend with increasing temperature is generally observed due to Umklapp scattering, and the temperature where data start deviating from linearity can be taken as the threshold temperature above which the bipolar contribution becomes significant. The data deriving from Yb-filled Co 4 Sb 12 follow this model [72].…”

Section: Resultsmentioning

confidence: 99%

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

et al. 2019

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The structural and thermoelectric properties of the filled skutterudite (Sm,Gd)y(FexNi1-x)4Sb12 were investigated and critically compared to the ones in the Sm-containing system with the aim of unravelling the effect of double filling on filling fraction and thermal conductivity. Several samples (x = 0.50–0.90 and y = 0.15–0.48) were prepared by melting-sintering, and two of them were densified by spark plasma sintering in order to study their thermoelectric features. The crystallographic study enables the recognition of the role of the filler size in ruling the filling fraction and the compositional location of the p/n crossover: It has been found that the former lowers and the latter moves toward lower x values with the reduction of the filler ionic size, as a consequence of the progressively weaker interaction of the filler with the Sb12 cavity. The analysis of thermoelectric properties indicates that, despite the Sm3+/Gd3+ small mass difference, the contemporary presence of these ions in the 2a site significantly affects the thermal conductivity of both p- and n-compositions. This occurs by reducing its value with respect to the Sm-filled compound at each temperature considered, and making the overall thermoelectric performance of the system comparable to several multi-filled (Fe, Ni)-based skutterudites described in the literature.

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Section: Resultsmentioning

confidence: 99%

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

et al. 2019

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“…14 The lling fraction limit (FFL) in CoSb 3 is reported to be 0.2 for ytterbium and 0.1 for cerium. 18 There are already some reports for Yb-lled skutterudites reaching a lling fraction close to 0.2, 48 or even above 0.25, 14 but for the case of Ce, its lling fraction barely reaches a value of $0.15 following a solubility design. 14 This low lling fraction and FFL for Ce is the main limiting factor to achieve the optimum carrier concentration in Ce-lled skutterudites.…”

Section: Discussionmentioning

confidence: 98%

Strongly reduced lattice thermal conductivity in Sn-doped rare-earth (M) filled skutterudites M_xCo₄Sb_12−ySn_y, promoted by Sb–Sn disordering and phase segregation

et al. 2021

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“… ZT of Yb 0.25 Co 4 Sb 12 / x CoSi 2 composites: (a) temperature dependent ZT ; (c) average ZT value; comparison of ZT max (b) and ZT ave (d) of Yb 0.25 Co 4 Sb 12 /0.05CoSi 2 sample with other representative works. ,,,,− ,− …”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

Shi

Niu

et al. 2022

ACS Appl. Mater. Interfaces

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It is known that Yb-filled skutterudite with excellent thermoelectric performance is promising for a power generation device in the intermediate temperature region. Here we created a new approach to obtain nanostructured materials by adding Si to Co-overstoichiometric Yb-filled skutterudite through high-energy ball milling, which embedded bottom-up formed CoSi 2 nanoparticles into grain-refining Yb 0.25 Co 4 Sb 12 , synergistically resulting in the enhanced thermoelectric properties and room-temperature hardness. On one hand, the abundant grain boundaries and phase interfaces effectively blocked the propagation of medium-low frequency phonons, resulting in a lower lattice thermal conductivity. On the other hand, phase interfaces barrier nicely screened a portion of low-energy electrons, leading to an improved power factor. As a result, an enhanced peak ZT value of ∼1.43 at 823 K and a promising average ZT of ∼1.00 between 300 and 823 K were achieved in the Yb 0.25 Co 4 Sb 12 / 0.05CoSi 2 sample. Meanwhile, such nanostructures also enhanced the hardness through the collective contributions of second phase and fine grain strengthening, which made skutterudite more competitive in practical application.

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Effect of rapid solidification on the synthesis and thermoelectric properties of Yb-filled Co4Sb12 skutterudite

Cited by 15 publications

References 35 publications

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

Strongly reduced lattice thermal conductivity in Sn-doped rare-earth (M) filled skutterudites M_xCo₄Sb_12−ySn_y, promoted by Sb–Sn disordering and phase segregation

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles

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Effect of rapid solidification on the synthesis and thermoelectric properties of Yb-filled Co4Sb12 skutterudite

Cited by 15 publications

References 35 publications

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

Structural Properties and Thermoelectric Performance of the Double-Filled Skutterudite (Sm,Gd)y(FexNi1-x)4Sb12

Strongly reduced lattice thermal conductivity in Sn-doped rare-earth (M) filled skutterudites MxCo4Sb12−ySny, promoted by Sb–Sn disordering and phase segregation

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi2 Nanoparticles

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Strongly reduced lattice thermal conductivity in Sn-doped rare-earth (M) filled skutterudites M_xCo₄Sb_12−ySn_y, promoted by Sb–Sn disordering and phase segregation

Enhanced Thermoelectric Performance of Yb-Filled Skutterudite with Bottom-Up Formed CoSi₂ Nanoparticles