HPHT synthesis of highly doped InxCo4Sb12 – Experimental and theoretical study

Leszczyński, Juliusz; Szczypka, Wojciech; Candolfi, Christophe; Dauscher, A.; Lenoir, Bertrand; Koleżyński, Andrzej

doi:10.1016/j.jallcom.2017.08.194

Cited by 16 publications

(16 citation statements)

References 43 publications

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“…In the Co2p region, only the Co2p 3/2 line was analysed due to interference with Sb MNN Auger electrons in a higher binding energies region. The recorded binding energy was equal to 777.76 eV, which is close to those previously obtained for filled CoSb 3 [49,51]. No additional maxima were found between 779 and 781 eV, which are binding energies characteristic for cobalt oxides [52].…”

Section: Structural and Microstructural Analysissupporting

confidence: 86%

“…In the Sb3d region, the spectrum can be fitted by only one doublet, similarly to the results presented in [53]. This effect, resulting from the different character of Sb bonding, is clearly visible in the XPS spectra presented in [49,51]. The obtained Sb3d 5/2 binding energy is close to that found in [51,49].…”

Section: Structural and Microstructural Analysissupporting

confidence: 80%

“…This effect, resulting from the different character of Sb bonding, is clearly visible in the XPS spectra presented in [49,51]. The obtained Sb3d 5/2 binding energy is close to that found in [51,49]. Additionally, the O1s maximum was present.…”

Section: Structural and Microstructural Analysissupporting

confidence: 72%

“…The position of the 3d 5/2 peak is slightly higher than for In 0 and lower than for the oxide compounds [47,48]. It could be correlated with an electron transfer to the matrix in the In-filled CoSb 3 [49], confirming the electron-donor character of In atoms. This is in agreement with the covalent character of In-Sb bonding [50].…”

Section: Structural and Microstructural Analysismentioning

confidence: 74%

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New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

et al. 2020

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Highly porous, In-filled CoSb 3 skutterudite materials with an attractive thermoelectric figure of merit (ZT * 1) and corresponding dense samples were fabricated through the cost-effective method of reduction in oxides in dry hydrogen and the pulsed electric current sintering (PECS) method, respectively. The reduction process was described in detail using in situ thermogravimetric analysis of Co 2 O 3 , Sb 2 O 3 and In(NO 3) 3 Á5H 2 O separately and in a mixture. Two methods to synthesise the same material were examined: (a) free sintering of an initially reduced powder and (b) PECS. The free-sintered materials with higher porosities (up to * 40%) exhibited lower values of electrical conductivity than the dense PECS samples (porosity up to * 5%), but the benefit of an even sixfold reduction in thermal conductivity resulted in higher ZT values. The theoretical values of thermal conductivity for various effective media models considering randomly oriented spheroid pores are in good agreement with the experimental thermal conductivity data. The assumed distribution and shape of the pores correlated well with the scanning electron microscope analysis of the microstructure. The lowest value of thermal conductivity, equal to 0.5 W/m K, was measured at 523 K for In 0.1 Co 4 Sb 12 with 41% porosity. The highest value of ZT max = 1.0 at 673 K was found for the In 0.2 Co 4 Sb 12 sample in which the porosity was 36%.

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Section: Structural and Microstructural Analysissupporting

confidence: 86%

Section: Structural and Microstructural Analysissupporting

confidence: 80%

Section: Structural and Microstructural Analysissupporting

confidence: 72%

Section: Structural and Microstructural Analysismentioning

confidence: 74%

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New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

et al. 2020

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“…The greater the amount of In introduced into CoSb 3 , the smaller the charge of indium atoms, which means that the increase in the In content in InCo 4 Sb 12 leads to a much higher carrier concentration compared to In 0.4 Co 4 Sb 12 , while the absolute value of Seebeck efficiency is lower. 4 On this basis, researchers have tried different doping methods, such as the co-doping of In-Sn, 86 In-Ba, 87 In-Ba-Te 88 and so forth. What caught our attention is that all the measures we mentioned before showed very low thermal conductivity, and the maximum ZT value showed good performance.…”

Section: Sintering Temperature (K)mentioning

confidence: 99%

High pressure: a feasible tool for the synthesis of unprecedented inorganic compounds

Wang

Liu

2020

Inorg. Chem. Front.

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Ce‐filled Ni_1.5Co_2.5Sb₁₂ Skutterudite Thin Films with Record‐High Figure of Merit And Device Performance

Li,

Shi,

Zhu

et al. 2023

Advanced Energy Materials

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Realizing high thermoelectric performance in CoSb3 skutterudite‐based thin films and their devices is historically challenging, especially due to the lack of high‐performing thin‐film‐based device working at medium‐to‐high temperatures. Here, a record‐high ZT of 1.1 is achieved at 683 K in an n‐type Ce0.3Ni1.5Co2.5Sb12 thin film, fabricated from a self‐designed target via advanced pulsed laser deposition. Both experimental and computational results confirm that the Ce‐filling and metal‐featured nanoinclusions such as CeSb contribute to high electrical conductivity, while the Ni‐doping and significantly strengthen the energy filtering effect that occurs at the dense interfaces between the Ce0.3Ni1.5Co2.5Sb12 matrix and the nanoinclusions which leads to a large Seebeck coefficient, giving rise to such a high ZT. In addition, a new‐type CoSb3 thin‐film‐based device is successfully fabricated, which exhibits a high output power density of 8.25 mW cm−2 at a temperature difference of 140 K and a cold‐side temperature of 573 K, indicating the potential for application to medium‐to‐high‐temperature power generation scenarios.

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HPHT synthesis of highly doped InxCo4Sb12 – Experimental and theoretical study

Cited by 16 publications

References 43 publications

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

High pressure: a feasible tool for the synthesis of unprecedented inorganic compounds

Ce‐filled Ni_1.5Co_2.5Sb₁₂ Skutterudite Thin Films with Record‐High Figure of Merit And Device Performance

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HPHT synthesis of highly doped InxCo4Sb12 – Experimental and theoretical study

Cited by 16 publications

References 43 publications

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

High pressure: a feasible tool for the synthesis of unprecedented inorganic compounds

Ce‐filled Ni1.5Co2.5Sb12 Skutterudite Thin Films with Record‐High Figure of Merit And Device Performance

Contact Info

Product

Resources

About

Ce‐filled Ni_1.5Co_2.5Sb₁₂ Skutterudite Thin Films with Record‐High Figure of Merit And Device Performance