18-Electron half-Heusler compound Ti<sub>0.75</sub>NiSb with intrinsic Ti vacancies as a promising thermoelectric material

Luo, Feng; Wang, Jian; Zhu, Can; He, Xuhui; Zhang, Shun; Wang, Jiafu; Liu, Hongxia; Sun, Zhigang

doi:10.1039/d2ta00461e

Cited by 13 publications

(26 citation statements)

References 62 publications

(106 reference statements)

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“…In addition, these samples also contain a small amount of NiSb and Ti 2 Ni impurity phases (Figure 3a−f), which is consistent with a previous result. 27 Notably, the Fe-composited samples contain areas with fine black contrast along the grain boundaries, and these areas become larger with the increase of x, especially for the samples of x ≥ 3 (Figure 3d−f). The EDS results show that Fe element is detected in these regions (Figure 3g,i).…”

Section: Resultsmentioning

confidence: 95%

“…Compared with the state-of-the-art ternary HH compounds, 48,54−56 Ti 0.75 NiSb has a larger Gruneisen parameter (γ) of 1.8 (Figure 13b), indicating a strong anharmonicity, 57,58 which is consistent with previous results. 27 Therefore, the intrinsically low lattice thermal conductivity of Ti 0.75 NiSb is associated with the strong anharmonicity and the intrinsic cationic vacancies. The further reduction of κ l mainly derives from the additional interface phonon scattering by magnetic Fe nanoparticles.…”

Section: Electronic Transportmentioning

confidence: 99%

“…26 Recently, through a precise manipulation of the Ti content in TiNiSb, a nearly single-phase compound has been obtained in 18-electron Ti 0.75 NiSb with a predicted zT as high as 1.0, thus showing the potential to be a promising thermoelectric material. 27 Ti 0.75 NiSb has an intrinsically low lattice thermal conductivity due to the existence of a large number of cation vacancies. Currently, the carrier concentration of Ti 0.75 NiSb is 6.53 × 10 21 cm −3 .…”

Section: Introductionmentioning

confidence: 99%

“…However, previous work has shown that to achieve a better thermoelectric property, its theoretical optimum value is 5.94 × 10 20 cm −3 . 27 Therefore, it is necessary to reduce the carrier concentration of Ti 0.75 NiSb to improve its TE performance.…”

Section: Introductionmentioning

confidence: 99%

“…Existing experimental results show that stoichiometric TiNiSb is thermodynamically unstable and its single-phase composition remains controversial . Recently, through a precise manipulation of the Ti content in TiNiSb, a nearly single-phase compound has been obtained in 18-electron Ti 0.75 NiSb with a predicted zT as high as 1.0, thus showing the potential to be a promising thermoelectric material . Ti 0.75 NiSb has an intrinsically low lattice thermal conductivity due to the existence of a large number of cation vacancies.…”

Section: Introductionmentioning

confidence: 99%

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Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Luo

Zhu

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Ti0.75NiSb is a half-Heusler compound with low lattice thermal conductivity due to a large number of cation vacancies. However, the higher carrier concentration limits the improvement of its thermoelectric performance. In this paper, magnetic Fe nanoparticles with a size of 30 nm are composited into Ti0.75NiSb in the form of the second phase. The charge transfer between Fe nanoparticles and Ti0.75NiSb leads to a decrease in carrier concentration. The strong interaction between the magnetic moment and carriers enhances the electron scattering, so that the scattering factor increases and the mobility decreases. The combined effect results in an increase of about 10% in the Seebeck coefficient and a decrease by about 14% in the electronic thermal conductivity at 873 K for the composite Ti0.75NiSb+2 mol % Fe. Meanwhile, the magnetic Fe nanoparticles provide additional scattering centers, leading to a decrease in lattice thermal conductivity. As a result, a zT value of 0.4 at 873 K is achieved for the composite Ti0.75NiSb+2 mol % Fe, which is 21% higher than that of Ti0.75NiSb. This work demonstrates that the compositing magnetic nanoparticles Fe can enhance the thermoelectric performance of Ti0.75NiSb.

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Section: Resultsmentioning

confidence: 95%

Section: Electronic Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Luo

Zhu

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Selective Scatterings of Phonons and Electrons in Defective Half‐Heusler Nb₁₋_δCoSb for the Figure of Merit zT > 1

Gao

Xia

Nan

et al. 2023

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The recently developed defective 19‐electron half‐Heusler (HH) compounds, represented by Nb1−δCoSb, possess massive intrinsic vacancies at the cation site and thus intrinsically low lattice thermal conductivity that is desirable for thermoelectric (TE) applications. Yet the TE performance of defective HHs with a maximum figure of merit (zT) <1.0 is still inferior to that of the conventional 18‐electron ones. Here, a peak zT exceeding unity is obtained at 1123 K for both Nb0.7Ta0.13CoSb and Nb0.6Ta0.23CoSb, a benchmark value for defective 19‐electron HHs. The improved zT results from the achievement of selective scatterings of phonons and electrons in defective Nb0.83CoSb, using lanthanide contraction as a design factor to select alloying elements that can strongly impede the phonon propagation but weakly disturb the periodic potential. Despite the massive vacancies induced strong point defect scattering of phonons in Nb0.83CoSb, Ta alloying is still found effective in suppressing lattice thermal conductivity while maintaining the carrier mobility almost unchanged. In comparison, V alloying significantly deteriorates the carrier transport and thus the TE performance. These results enlarge the category of high‐performance HH TE materials beyond the conventional 18‐electron ones and highlight the effectiveness of selective scatterings of phonons and electrons in developing TE materials even with massive vacancies.

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Effects of magnetic Fe doping on the thermoelectric properties of TiNiSn nanomaterials prepared via melt spinning method

He,

Shen,

Zhai

et al. 2024

Journal of Alloys and Compounds

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18-Electron half-Heusler compound Ti_0.75NiSb with intrinsic Ti vacancies as a promising thermoelectric material

Abstract: Ti vacancies in 18-electron half-Heusler compound Ti0.75NiSb cause lower lattice thermal conductivity.

Cited by 13 publications

References 62 publications

Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Selective Scatterings of Phonons and Electrons in Defective Half‐Heusler Nb₁₋_δCoSb for the Figure of Merit zT > 1

Effects of magnetic Fe doping on the thermoelectric properties of TiNiSn nanomaterials prepared via melt spinning method

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18-Electron half-Heusler compound Ti0.75NiSb with intrinsic Ti vacancies as a promising thermoelectric material

Abstract: Ti vacancies in 18-electron half-Heusler compound Ti0.75NiSb cause lower lattice thermal conductivity.

Cited by 13 publications

References 62 publications

Magnetically Enhanced Thermoelectric Performance of Ti0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Magnetically Enhanced Thermoelectric Performance of Ti0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Selective Scatterings of Phonons and Electrons in Defective Half‐Heusler Nb1−δCoSb for the Figure of Merit zT > 1

Effects of magnetic Fe doping on the thermoelectric properties of TiNiSn nanomaterials prepared via melt spinning method

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Product

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About

18-Electron half-Heusler compound Ti_0.75NiSb with intrinsic Ti vacancies as a promising thermoelectric material

Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Magnetically Enhanced Thermoelectric Performance of Ti_0.75NiSb+x mol % Fe (x = 0–5) Nanocomposites

Selective Scatterings of Phonons and Electrons in Defective Half‐Heusler Nb₁₋_δCoSb for the Figure of Merit zT > 1