The Effect of Grain Size and Density on the Thermoelectric Properties of Bi2Te3-PbTe Compounds

Yoon, Sejin; Kwon, O-Jong; Ahn, Sang-Ho; Kim, Jae-Yeol; Koo, Hyun Jo; Bae, Sung-Hwan; Cho, Jun-Young; J, Kim; Park, Chan

doi:10.1007/s11664-013-2753-2

Cited by 36 publications

(13 citation statements)

References 20 publications

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“…The scattering probabilities between carriers and nonuniformities depend on the interaction time and the number of nonuniformities. The relationship between pore and electrical conductivity σ can be expressed by effective medium theory as follows:

σ = [false(3 f - 1 false) {normalσ}_{0}] / 2

where f is the fraction of material except pores and σ 0 is the electrical conductivity of the material without any pores. A large amount of nonuniformities caused by high porosity and small grain size resulted in a significant low carrier mobility, thereby reducing electrical conductivity .…”

Section: Resultsmentioning

confidence: 99%

“…Phonon scattering can occur at various sites, such as pore, grain boundary, oxygen vacancy, and distorted lattice. The relation between the thermal conductivity and volume of pores can be expressed as follows:

κ = {normalκ}_{0} false(1 - P^{2 false/ 3} false),

where κ 0 is the thermal conductivity of the material without any pores and P is the fraction of pores in the compound.…”

Section: Resultsmentioning

confidence: 99%

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Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

et al. 2017

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Ca 0.8 Y 0.2Àx Dy x MnO 3Àd (0≤x≤0.2) samples were fabricated by the solid-state reaction method, and their thermoelectric properties were studied from 500°C to 800°C. Upon the substitution of Dy 3+ for Y 3+ in the Ca 0.8 Y 0.2Àx Dy x MnO 3Àd , the electrical and thermal conductivities gradually decreased with increasing Dy 3+ concentration, whereas the absolute value of the Seebeck coefficient significantly increased. The Ca 0.8 Dy 0.2 MnO 3Àd showed the largest value of dimensionless figure of merit (0.180) at 800°C as a result of the combination of the largest absolute value of the Seebeck coefficient and the lowest thermal conductivity. We believe that the Ca 0.8 Dy 0.2 MnO 3Àd is a promising thermoelectric material at high temperatures.

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σ = [false(3 f - 1 false) {normalσ}_{0}] / 2

Section: Resultsmentioning

confidence: 99%

κ = {normalκ}_{0} false(1 - P^{2 false/ 3} false),

where κ 0 is the thermal conductivity of the material without any pores and P is the fraction of pores in the compound.…”

Section: Resultsmentioning

confidence: 99%

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

et al. 2017

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“…Engineering the structure of the material at the micro and nanoscale (nanostructuring) can lessen the lattice conductivity considerably [2,3,4,5]. One way this can be achieved is by controlling the grain size in polycrystalline materials [6,7,8,9]. However, nanostructures might anneal at finite temperatures and distributions with small mean grain sizes may not be stable, which results in grain growth.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of porous polycrystalline PbTe

Troncoso

Chudziński

Todorov

et al. 2021

Phys. Rev. Materials

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PbTe is a leading thermoelectric material at intermediate temperatures, largely thanks to its low lattice thermal conductivity. However, its efficiency is too low to compete with other forms of power generation. This efficiency can be effectively enhanced by designing nanostructures capable of scattering phonons over a wide range of length scales to reduce the lattice thermal conductivity. The presence of grain boundaries can reduce the thermal conductivity to ∼ 0.5 Wm −1 K −1 for small vacancy concentrations and grain sizes. However, grains anneal at finite temperature, and equilibrium and metastable grain size distributions determine the extent of the reduction in thermal conductivity. In the present work, we propose a phase-field model informed by molecular dynamics simulations to study the annealing process in PbTe and how it is affected by the presence of grain boundaries and voids. We find that the thermal conductivity of PbTe is reduced by up to 35% in the porous material at low temperatures. We observe that a phase transition at a finite density of voids governs the kinetics of impeding grain growth by Zener pinning.

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“…Also, reducing the grain size or increasing porosity can enhance phonon scattering and thus increase ZT [16,17].…”

Section: Introductionmentioning

confidence: 99%

Influence of silver nanoparticle addition, porosity, and processing technique on the mechanical properties of Ba0.3Co4Sb12 skutterudites

et al. 2014

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The thermoelectric skutterudite Ba 0.3 Co 4 Sb 12 is a promising candidate for waste heat recovery applications. Recently, it was demonstrated that the addition of silver nanoparticles (Ag NP ) to Ba 0.3 Co 4 Sb 12 increases both the thermoelectric figure of merit and electrical conductivity. This study is the first to examine the effect of Ag NP addition on the material's mechanical properties. This study also found that the Young's modulus, E, shear modulus, G, and bulk modulus, B, decreased linearly with increasing volume fraction porosity, P. Resonant ultrasound spectroscopy was employed to measure the elastic moduli, and Vickers indentation was used to determine the hardness, H, and fracture toughness, K C . Trends in the mechanical properties as a function of grain size, porosity, and the Ag NP are discussed in terms of the pertinent literature. While K C was independent of Ag NP addition, porosity, and grain size, both E and H decreased linearly with increasing porosity. In addition, this study is the first to identify (i) the Ag 3 Sb phase formed and (ii) the enhanced densification that occurs when the Ag NP is sintered with Ba 0.3 Co 4 Sb 12 powders, where both effects are consistent with the eutectic and peritectic reactions observed in the binary phase diagram Ag-Sb. These eutectic/peritectic reactions may also be linked to the enhancement of electrical conductivity previously observed when Ag is added to Ba 0.3 Co 4 Sb 12 . Also, similar beneficial eutectic/peritectic reactions may be available for other systems where conductive particles are added to other antimonides or other thermoelectric systems.

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The Effect of Grain Size and Density on the Thermoelectric Properties of Bi2Te3-PbTe Compounds

Cited by 36 publications

References 20 publications

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

Thermal conductivity of porous polycrystalline PbTe

Influence of silver nanoparticle addition, porosity, and processing technique on the mechanical properties of Ba0.3Co4Sb12 skutterudites

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The Effect of Grain Size and Density on the Thermoelectric Properties of Bi2Te3-PbTe Compounds

Cited by 36 publications

References 20 publications

Electrical transport and thermoelectric properties of Ca0.8Y0.2−xDyxMnO3−δ (0 ≤ x ≤ 0.2)

Electrical transport and thermoelectric properties of Ca0.8Y0.2−xDyxMnO3−δ (0 ≤ x ≤ 0.2)

Thermal conductivity of porous polycrystalline PbTe

Influence of silver nanoparticle addition, porosity, and processing technique on the mechanical properties of Ba0.3Co4Sb12 skutterudites

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Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)