Research progress of p-type Fe-based skutterudite thermoelectric materials

Tong, Xin; Liu, Zhiyuan; Zhu, Jianglong; Yang, Ting; Wang, Yonggui; Xia, Ailin

doi:10.1007/s11706-021-0563-7

Cited by 14 publications

(10 citation statements)

References 105 publications

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Section: Resultsmentioning

confidence: 99%

“…In addition, it should me mentioned that these ZT values are in the range of or even higher than those of skutterudites, with outstanding high ZTs, prepared in the traditional way, i. e. by HP or spark plasma sintering. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The ZT-matching thermal-electric conversion efficiencies, η, are plotted in the lower panel of Figure 11. Whereas in case of the p-type samples almost all efficiencies (calculated for the temperature range of 300 K to 857 K) are in the range of 14 % to 15 %, the efficiencies of the n-type samples, due to a bigger variety in ZT values, vary between 9.8 % and 17.9 %, the latter being an outstanding high value.…”

Section: Samples With a Height Of ~1 MMmentioning

confidence: 99%

“…which appears as a fraction of the Carnot efficiency, where T h and T c are the temperatures on the hot and cold side, respectively. Many thermoelectric materials are being explored for power generation applications, such as GeTe, [1] PbTe, [2] Bi 2 Te 3 , [3] silicides, [4] half Heuslers [5] or skutterudites, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] the latter being focused on in this work. Samples, prepared via ball milling (BM) prior to hot pressing (HP) achieve grain sizes in the order of micometers or of about 100 nanometers, respectively.…”

Section: Introductionmentioning

confidence: 99%

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High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Rogl

2022

Zeitschrift anorg allge chemie

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Dedicated to Professor Mercouri Kanatzidis on the occasion of his 65th birthdayFor mass production of thermoelectric generators, a cheap/ sustainable method is required to fabricate leg material with a high figure of merit, ZT. Severe plastic deformation, SPD, increases the defect density, and in parallel decreases the grains to nano-size. SPD via high-pressure torsion, HPT, was used to process hot pressed discs, whereby the Seebeck coefficient remained unchanged and the enhanced electrical resistivity was overcompensated by a low thermal conductivity, resulting in a raise of ZT. Secondly, cold pressed commercial p-and n-type skutterudite-powder was deformed via HPT, exhibiting higher ZT values than the hot-pressed reference samples. This method was upscaled to samples of 30 mm diameter (heights: 1 mm, 8 mm). These large samples, enabled to study the influence of shear strain with all its impact on micro-structural, physical and mechanical properties, revealing for the thin samples record high ZTs. Both thick samples showed homogeneous properties and ZTs ~1.3.

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Section: Resultsmentioning

confidence: 99%

Section: Samples With a Height Of ~1 MMmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Rogl

2022

Zeitschrift anorg allge chemie

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“…These fillers can significantly strengthen the phonon scattering to reduce κ l in CoSb 3 -based skutterudites. Particularly, rare-earth Yb and Ce fillers, with heavy atomic masses and small ionic radii, can effectively reduce κ l . , For the p-type CoSb 3 -based skutterudites, the dominating carriers and the corresponding electrical conducting types can be tuned by substitution at the Co or Sb site. − Pandya et al partially replaced Co with Fe, and a p-type Co 0.95 Fe 0.05 Sb 3 was obtained with a room-temperature S of ∼55 μV K –1 and a high S 2 σ of ∼10 μW cm –1 K –2 . Ba-filled and Fe-substituted (at Co sites) BaFe 4 Sb 12 possesses a p-type electrical conducting behavior with a room-temperature S of ∼65 μV K –1 and a zT of 0.62 at 800 K. In addition, Ge substitution at the Sb site forms a p-type Co 4 Ge 0.5 Sb 11.5 with a room-temperature S of ∼50 μV K –1 .…”

Section: Introductionmentioning

confidence: 99%

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Thermoelectric properties of CoSb 3 -based skutterudites are greatly determined by the removal of detrimental impurities, such as (Fe/Co)Sb 2 , (Fe/Co)Sb, and Sb. In this study, we use a facile temperature gradient zone melting (TGZM) method to synthesize high-performance CoSb 3 -based skutterudites by impurity removal. After removing metallic or semimetallic impurities (Fe/Co)Sb, (Fe/Co)Sb 2 , and Sb, the carrier concentration of TGZM-Ce 0.75 Fe 3 CoSb 12 can be reduced to 1.21 × 10 20 cm −3 and the electronic thermal conductivity dramatically reduced to 0.7 W m −1 K −1 at 693 K. Additionally, removing these impurities also effectively reduces the lattice thermal conductivity from 7.2 W m −1 K −1 of cast-Ce 0.75 Fe 3 CoSb 12 to 1.02 W m −1 K −1 of TGZM-Ce 0.75 Fe 3 CoSb 12 at 693 K. As a consequence, TGZM-Ce 0.75 Fe 3 CoSb 12 approaches a high power factor of 11.7 μW cm −1 K −2 and low thermal conductivity of 1.72 W m −1 K −1 at 693 K, leading to a peak zT of 0.48 at 693 K, which is 10 times higher than that of cast-Ce 0.75 Fe 3 CoSb 12 . This study indicates that our facile TGZM method can effectively synthesize high-performance CoSb 3 -based skutterudites by impurity removal and set up a solid foundation for further development.

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“…Skutterudite compounds, as important energy conversion materials, have potential applications in the fields of waste heat recovery and space power generation owing to their excellent TE performances at intermediate temperatures [6][7][8] and excellent mechanical strengths [9][10][11]. The candidates doped or filled the CoSb 3 -and FeSb 3 -based skutterudites are appropriate for n-and p-type legs of TE devices, respectively [12][13][14][15]. Over the past few decades, by different optimization methods, the highest ZT values of single-phase multi-filled n-and p-type skutterudites reached 2.0 [16] and 1.3 [17], respectively.…”

mentioning

confidence: 99%

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

Liu¹,

Wang²,

Yang³

et al. 2023

Journal of Advanced Ceramics

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The enhancements in thermoelectric (TE) performances of p-type skutterudites are usually limited due to the relatively low Seebeck coefficients owing to the higher carrier concentration and more impurity phases induced by inherent structural instability of a Fe-based skutterudite. As shown in this study, alloying engineering of Ni doping at Fe sites in a p-type CeFe 3.8 Co 0.2 Sb 12 skutterudite can not only reduce the impurity phases with high thermal conductivity but also regulate the carrier concentration, and thus significantly increase the Seebeck coefficient. The thermal conductivity was largely suppressed due to the enhanced point defect phonon scattering and decreased hole concentration. As a result, a TE figure of merit ZT of the CeFe 3.5 Ni 0.3 Co 0.2 Sb 12 sample reached 0.8, which is approximately 50% higher than that of a Ni-free sample. Appropriate Ni doping can maintain a high ZT at a high temperature by controlling the reduction in a band gap. Therefore, a high average ZT close to 0.8 at 650-800 K for CeFe 3.5 Ni 0.3 Co 0.2 Sb 12 was obtained, which was comparable to or even higher than those of the reported Ce-filled Fe-based skutterudites due to the synergistic optimization of electrical and thermal performances. This study provides a strategy to synergistically optimize electrical-thermal performances of the p-type skutterudites by alloying engineering.

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Research progress of p-type Fe-based skutterudite thermoelectric materials

Cited by 14 publications

References 105 publications

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

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Research progress of p-type Fe-based skutterudite thermoelectric materials

Cited by 14 publications

References 105 publications

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

High pressure torsion, a large‐scale manufacturing tool for high ZT skutterudite thermoelectrics

Impurity Removal Leading to High-Performance CoSb3-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction

Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

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Impurity Removal Leading to High-Performance CoSb₃-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction