Achieving a fine balance between the strong mechanical and high thermoelectric properties of n-type PbTe–3% Sb materials by alloying with PbS

Fu, Liangwei; Cui, Juan; Yu, Yong; Huang, Yi; Wang, Yifan; Chen, Yue; He, Jiaqing

doi:10.1039/c9ta00400a

Cited by 30 publications

(28 citation statements)

References 34 publications

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“…The inherently higher defect concentrations associated with p‐type doping relative to n‐type doping, as well as lower doping efficiencies in Ag and K dopants may play a key role in explaining high p‐type hardness and outlier samples on the p‐type side of Figure 2. Other works find low doping efficiency dopants and/or point defects restrict dislocation movement in PbSe [ 57 ] and PbS, [ 58,59 ] which corroborates the high hardness observed from p‐type doping in both systems. [ 5 ]…”

Section: Resultssupporting

confidence: 74%

Dislocations Stabilized by Point Defects Increase Brittleness in PbTe

Male

Abdellaoui

et al. 2021

Adv Funct Materials

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Dislocations and the residual strain they produce are instrumental for the high thermoelectric figure of merit, zT ≈ 2, in lead chalcogenides. However, these materials tend to be brittle, barring them from practical green energy and deep space applications. Nonetheless, the bulk of thermoelectrics research focuses on increasing zT without considering mechanical performance. Optimized thermoelectric materials always involve high point defect concentrations for doping and solid solution alloying. Brittle materials show limited plasticity (dislocation motion), yet clear links between crystallographic defects and embrittlement are hitherto unestablished in PbTe. This study identifies connections between dislocations, point defects, and the brittleness (correlated with Vickers hardness) in single crystal and polycrystalline PbTe with various n‐ and p‐type dopants. Speed of sound measurements show a lack of electronic bond stiffening in p‐type PbTe, contrary to the previous speculation. Instead, varied routes of point defect–dislocation interaction restrict dislocation motion and drive embrittlement: dopants with low doping efficiency cause high defect concentrations, interstitial n‐type dopants (Ag and Cu) create highly strained obstacles to dislocation motion, and highly mobile dopants can distribute inhomogeneously or segregate to dislocations. These results illustrate the consequences of excessive defect engineering and the necessity to consider both mechanical and thermoelectric performance when researching thermoelectric materials for practical applications.

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Section: Resultssupporting

confidence: 74%

Dislocations Stabilized by Point Defects Increase Brittleness in PbTe

Male

Abdellaoui

et al. 2021

Adv Funct Materials

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“…Vickers hardness is found to significantly increase due to PbSe alloying, which is actually higher than those reported in the literatures on PbTe thermoelectric materials. [71][72][73][74][75] ), with a comparison to that of literature results. [48,[71][72][73][74][75]…”

Section: Resultsmentioning

confidence: 99%

“…Figure 6. a) Temperature-dependent peak and average zT and b) Vickers hardness for Na 0.03 Eu 0.03 Pb 0.94 Te 1Àx Se x (0 ≤ x ≤ 0.4), with a comparison to that of literature results [48,[71][72][73][74][75]. …”

mentioning

confidence: 99%

Manipulation of Defects for High‐Performance Thermoelectric PbTe‐Based Alloys

Zhou

Chen

et al. 2021

Small Structures

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0D Point defects, 1D dislocations and 2D interfaces act as effective sources for scattering phonons due to the fluctuations in atomic mass and lattice strain. Dislocations have been demonstrated recently to enable a significant reduction in lattice thermal conductivity of PbTe, and a co‐substitution of Eu and Na at Pb site was found to effectively introduce dense in‐grain dislocations in p‐PbTe. This motivates this work to focus on a further PbSe alloying in Na0.03Eu0.03Pb0.94Te for introducing point defects in addition to these dislocations, with participation of a further reduction in lattice thermal conductivity. The resultant extremely low lattice thermal conductivity (a minimum of ≈0.4 W m−1 K−1) in the entire temperature range leads to an eventual ≈30% enhancement in the average thermoelectric figure of merit zT in the working temperature range and a peak zT as high as ≈2.3 at 850 K in Na0.03Eu0.03Pb0.94Te0.9Se0.1.

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“…In Fu's work, they chose to dope n-type PbTe-3%Sb material and improve the mechanical properties of the material by alloying it with PbS. According to their data, after alloying, the hardness of the sample increased by more than 60%, the microhardness increased from 54.2 kg mm-2 to about 88 kg mm-2 while the relative ZT value decreased by only 7.4%, still about 1.5(shown in Figure 5) [19]. It shows that a relatviely good balance is achieved between the mechanical properties and thermoelectric properties of PbTe materials.…”

Section: Balance the Strong Mechanical Properties And High Thermoelec...mentioning

confidence: 99%

Progress and trend of PbTe based Thermoelectric Materials

Zhou

2022

J. Phys.: Conf. Ser.

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Energy shortage and environmental pollution have become severe problems that can not be ignored in every country. As a new energy conversion material, thermoelectric material can realize thermoelectric conversion with the advantages of safety, energy saving and environmental protection. This paper summarizes the progress of some PbTe based thermoelectric materials in recent ten years, including the influence of doping elements such as Na, S, Sr and I on their thermoelectric properties, and introduces a method to balance their mechanical and thermoelectric properties. It can be seen that PbTe based thermoelectric materials have good development and broad application prospects in the future.

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Achieving a fine balance between the strong mechanical and high thermoelectric properties of n-type PbTe–3% Sb materials by alloying with PbS

Abstract: Alloying PbS in PbTe–3% Sb enables a fine balance between mechanical and thermoelectric properties.

Cited by 30 publications

References 34 publications

Dislocations Stabilized by Point Defects Increase Brittleness in PbTe

Dislocations Stabilized by Point Defects Increase Brittleness in PbTe

Manipulation of Defects for High‐Performance Thermoelectric PbTe‐Based Alloys

Progress and trend of PbTe based Thermoelectric Materials

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