Approaching the minimum lattice thermal conductivity in TiCoSb half-Heusler alloys by intensified point-defect phonon scattering

Verma, Ajay Kumar; Jain, Shamma; Johari, Kishor Kumar; Candolfi, Christophe; Lenoir, Bertrand; Walia, Sumeet; Dhakate, S. R.; Gahtori, Bhasker

doi:10.1039/d3ma00923h

Mater. Adv.

2023

DOI: 10.1039/d3ma00923h

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Approaching the minimum lattice thermal conductivity in TiCoSb half-Heusler alloys by intensified point-defect phonon scattering

Ajay Kumar Verma,

Shamma Jain,

Kishor Kumar Johari

et al.

Abstract: Enhanced point defect phonons scattering through huge isovalent substitution substantially reduces the lattice thermal conductivity of half-Heusler alloys.

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2024

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Cited by 4 publications

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Weak electron-phonon coupling contributing to enhanced thermoelectric performance in n-type TiCoSb half-Heusler alloys

Verma,

Jain,

Johari

et al. 2024

Journal of Alloys and Compounds

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Weak electron-phonon coupling contributing to enhanced thermoelectric performance in n-type TiCoSb half-Heusler alloys

Verma,

Jain,

Johari

et al. 2024

Journal of Alloys and Compounds

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Enhanced Thermoelectric Performance of ZrCoSb Half-Heusler Compounds by Sn–Bi Codoping

Tan,

Jiang,

Xian

et al. 2024

ACS Appl. Energy Mater.

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ZrCoSb-based half-Heusler compounds have shown outstanding thermoelectric and mechanical properties, making them highly promising for practical applications. However, most optimization strategies have focused on doping costly Hf at the Zr sites. Here, the structural evolution, thermoelectric properties, and transport mechanisms of ZrCoSb0.8–x Sn0.2Bi x compounds co-doped with less-costly Sn and Bi at Sb sites were investigated. Specifically, grains were refined via Bi doping, which introduced grain boundary scattering at low temperatures. The effect of grain-boundary scattering on electron transport weakened and became less pronounced at higher temperatures. Thus, the discrepancy in the weighted mobility of ZrCoSb0.8–x Sn0.2Bi x compounds was reduced. Furthermore, increasing Bi doping level significantly reduced the lattice thermal conductivity due to the introduction of large mass and strain field fluctuations. As a result, the trade-off between the weighted mobility and the lattice thermal conductivity at high temperatures enabled the dimensionless figure of merit (ZT) for ZrCoSb0.71Sn0.2Bi0.09 to be 0.68 at 973 K, an enhancement of 44.6% relative to the single Sn-doped ZrCoSb compound. Overall, this work demonstrates the feasibility of enhancing ZT via co-doping only at the Sb site, and it highlights microstructure effects on thermoelectric properties.

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Radioisotope thermoelectric generators (RTGs): a review of current challenges and future applications

Naseem,

Lee,

2024

Chem. Commun.

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Approaching the minimum lattice thermal conductivity in TiCoSb half-Heusler alloys by intensified point-defect phonon scattering

Abstract: Enhanced point defect phonons scattering through huge isovalent substitution substantially reduces the lattice thermal conductivity of half-Heusler alloys.

Cited by 4 publications

References 65 publications

Weak electron-phonon coupling contributing to enhanced thermoelectric performance in n-type TiCoSb half-Heusler alloys

Weak electron-phonon coupling contributing to enhanced thermoelectric performance in n-type TiCoSb half-Heusler alloys

Enhanced Thermoelectric Performance of ZrCoSb Half-Heusler Compounds by Sn–Bi Codoping

Radioisotope thermoelectric generators (RTGs): a review of current challenges and future applications

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