Thermoelectric properties of Ni0.15Co3.85Sb12 and Fe0.2Ni0.15Co3.65Sb12 skutterudites prepared by HPHT method

Kong, Lingjiao; Ma, Hongan; Zhang, Yuewen; Guo, Xin; Sun, Bing; Liu, Binwu; Liu, Haiqiang; Li, Baomin; Chen, Jiaxiang; Jia, Xiaopeng

doi:10.1515/msp-2017-0069

Cited by 3 publications

(2 citation statements)

References 21 publications

(21 reference statements)

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“…The Jet Propulsion Laboratory in the United States has conducted extensive research on skutterudite compounds and developed ternary skutterudite compounds . The chemical formula of the multicomponent skutterudite can be written as A x Co 4– x Sb 12– y B y , where A represents elements such as Fe, Ni, Pb, , and B represents elements such as Sn, Te, Se. , The carrier concentration is optimized by element replacement at the Co or Sb sites, and a point defect scattering phonon is incorporated into the lattice to reduce its thermal conductivity. Atoms of different periods are typically used for binary or multiple substitutions at the Sb position of the skutterudite compound.…”

Section: Introductionmentioning

confidence: 99%

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

et al. 2022

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In recent years, skutterudite filled with electronegative elements (S, Se, Cl, Br) has attracted the extensive attention of researchers. By doping electron donors (Pb, Ni, or Te, S, Se) at the Co or Sb sites, the electronegative elements can form thermodynamically stable compounds in the intrinsic pores of the skutterudite, substantially expanding the research scope of skutterudite. In this study, S0.05Co4Sb11.3Te0.6Se0.1 skutterudite was synthesized at high pressure and high temperature, with a pressure range of 2.0–3.5 GPa. The phase composition, micro-morphology, and electrical and thermal transport properties were systematically characterized. The micromorphology analysis shows that the introduction of S element and substituting Te and Se at the Sb sites inhibit the grain growth in a suitable high-pressure environment. Substantial differences are observed in the directions of the lattice stripes in the samples, and rich grain boundaries and many lattice distortions and dislocation defects occur. The carrier concentration can be optimized by filling the voids of the skutterudite with a few S atoms, and the thermoelectric properties can be optimized by scattering phonons through resonance scattering and defect scattering. The samples synthesized at a pressure of 3.0 GPa and a temperature of 900 K have a maximum power factor of 23.85 × 10–4 W m–1 K–2 and a maximum zT value of 1.30 at a test temperature of 773 K.

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Section: Introductionmentioning

confidence: 99%

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

et al. 2022

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“…Lowering the lattice thermal conductivity of Co 4 Sb 12 is possible though by substituting Co or Sb using single or multiple elements. These dopants introduce defects into the system due to the difference in atomic radii and atomic masses, which will scatter the phonons. − Filling the voids by suitable elements also helps to reduce the lattice thermal conductivity. − The rattling of elements in the voids scatters the phonons more effectively than doping. The nanostructuring − and interface phonon scattering − are also effective measures, employed for decreasing the thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Performance in the Ba_0.3Co₄Sb₁₂/InSb Nanocomposite Originating from the Minimum Possible Lattice Thermal Conductivity

Ghosh

Shankar

Karati

et al. 2020

ACS Appl. Mater. Interfaces

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The thermoelectric efficiency of skutterudite materials can be improved by lowering the lattice thermal conductivity via the uniform dispersion of a nanosized second phase in the matrix of filled Co 4 Sb 12 . In this work, nanocomposites of Ba 0.3 Co 4 Sb 12 and InSb were synthesized using ball-milling and spark plasma sintering. The thermoelectric transport properties were studied from 4.2 to 773 K. The InSb nanoparticles of ∼20 nm were found to be dispersed in the Ba 0.3 Co 4 Sb 12 grains with a few larger grains of about 10 μm due to the agglomeration of the InSb nanoparticles. The +2 oxidation state of Ba in Co 4 Sb 12 resulted in a low electrical resistivity, ρ, value of the matrix. The enhancement of the Seebeck coefficient, S, and the electrical resistivity values of Ba 0.3 Co 4 Sb 12 with the addition of InSb can be credited to the energy-filtering effect of electrons with low energy at the interfaces. The power factor of the composites could not be enhanced compared to the matrix because of the very high ρ value. A minimum possible lattice thermal conductivity (0.45 W/m•K at 773 K) was achieved due to the combined effect of rattling of Ba atoms in the voids and enhanced phonon scattering at the interfaces induced by nanosized InSb particles. As a result, the (InSb) 0.15 + Ba 0.3 Co 4 Sb 12 composite exhibited improved thermoelectric properties with the highest zT of 1.4 at 773 K and improved mechanical properties with a higher hardness, higher Young's modulus, and lower brittleness.

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Efficiently synthesized n-type CoSb3 thermoelectric alloys under TGZM effect

Yang

et al. 2021

Materials Science in Semiconductor Processing

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Thermoelectric properties of Ni_0.15Co_3.85Sb₁₂ and Fe_0.2Ni_0.15Co_3.65Sb₁₂ skutterudites prepared by HPHT method

Cited by 3 publications

References 21 publications

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

Enhanced Thermoelectric Performance in the Ba_0.3Co₄Sb₁₂/InSb Nanocomposite Originating from the Minimum Possible Lattice Thermal Conductivity

Efficiently synthesized n-type CoSb3 thermoelectric alloys under TGZM effect

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Thermoelectric properties of Ni0.15Co3.85Sb12 and Fe0.2Ni0.15Co3.65Sb12 skutterudites prepared by HPHT method

Cited by 3 publications

References 21 publications

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

Synthesis Optimization and Thermoelectric Properties of S-Filled and Te-Se Double-Substituted Skutterudite under High Pressure

Enhanced Thermoelectric Performance in the Ba0.3Co4Sb12/InSb Nanocomposite Originating from the Minimum Possible Lattice Thermal Conductivity

Efficiently synthesized n-type CoSb3 thermoelectric alloys under TGZM effect

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Thermoelectric properties of Ni_0.15Co_3.85Sb₁₂ and Fe_0.2Ni_0.15Co_3.65Sb₁₂ skutterudites prepared by HPHT method

Enhanced Thermoelectric Performance in the Ba_0.3Co₄Sb₁₂/InSb Nanocomposite Originating from the Minimum Possible Lattice Thermal Conductivity