Improved thermoelectric properties of AgSbTe2 based compounds with nanoscale Ag2Te in situ precipitates

Zhang, S.N.; Zhu, Tiejun; Yang, Shenghui; Yu, Chengtao; Zhao, Xinbing

doi:10.1016/j.jallcom.2010.03.170

Cited by 60 publications

(50 citation statements)

References 31 publications

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“…Based on the phase diagram of Ag 32 , we estimated a lattice-dominated thermal conductivity, κ lat 0.65 Wm −1 K −1 at 200 K, and weakly dependent on T , which is in good agreement with prior reports in the literature [10][11][12]14 .…”

Section: A Synthesis and Characterizationsupporting

confidence: 89%

“…For example, in PbTe κ lat 2.2 Wm −1 K −1 at 300 K, further decreasing at higher temperatures owing to anharmonicity-dominated phonon scattering [6][7][8][9] . The compound AgSbTe 2 exhibits an even lower thermal conductivity, κ lat 0.7 Wm −1 K −1 at 300 K, also showing a glass-like temperature-independent behavior [10][11][12][13][14] . In pure form, this compound exhibits a relatively high ZT ≈ 1.2 at 720 K 3,15 .…”

Section: Introductionmentioning

confidence: 99%

“…10). Several mechanisms have been suggested to explain the very low, glass-like κ lat , such as strong anharmonicity 12,17 , force-constants differences around Ag and Sb atoms 18 , and nanoprecipitates 13,14,[19][20][21][22] . However, the lack of direct microscopic measurements of the phonon scattering rates and mean-free-paths has hampered a detailed understanding.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it has remained a long-standing question whether the cations are ordered or disordered on their sublattice 12,[25][26][27][28] . While single-crystal x-ray diffraction and first-principles simulations identified ordered structures (such as L1 1 or D4 cation arrangements), the powder diffraction studies generally report a disorderedrocksalt arrangement [12][13][14]17 .…”

Section: Introductionmentioning

confidence: 99%

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Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
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The phonon dispersions and scattering rates of the thermoelectric material Ag1−xSb1+xTe2+x (x = 0, 0.1, 0.2) were measured with inelastic neutron scattering, as function of both temperature T and off-stoichiometry x. In addition, detailed measurements of diffuse scattering were performed with both neutron and synchrotron x-ray diffraction. The results show that phonon scattering rates are large and weakly dependent on T or x, and the lattice thermal conductivity calculated from these scattering rates and group velocities is in good agreement with bulk transport measurements. We also find that the scattering rates and their temperature dependence cannot be accounted for with common models of phonon scattering by anharmonicity or point defects. The diffuse scattering measurements show a pervasive, complex signal, with several distinct components. In particular, broad superstructure reflections indicate a short-range ordering of the Ag and Sb cations on their sublattice. Single-crystal Bragg peak intensities also reveal large static atomic displacements, compatible with results from Rietveld refinement of neutron powder diffraction data. Our results indicate that a complex nanostructure, arising from multiple variants of nanoscale anisotropic superstructures of cations, and large atomic displacements, is likely responsible for the strong phonon scattering.

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Section: A Synthesis and Characterizationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
15
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12
0
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“…The conversion efficiency of a thermoelectric (TE) material is guided by a dimensionless figure-of-merit (zT = S 2 σ /κ), whereas the S refers to the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature and κ is the thermal conductivity that comprises two contributors from the traveling phonons (κ L ) and the transporting electrons (κ e ), respectively. Strategies for zT enhancement have been enormously reported in the past decade, including the maximization of S thorough the band structure engineering [2], the reduction of κ via the nanostructuring [3] while maintaining high σ by increasing the carrier mobility. Accordingly, improving the electronic transport (i.e.…”

Section: Introductionmentioning

confidence: 99%

Interfacial reactions in thermoelectric modules

Wei

et al. 2018

Materials Research Letters

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Engineering transport properties of thermoelectric (TE) materials leads to incessantly breakthroughs in the zT values. Nevertheless, modular design holds a key factor to advance the TE technology. Herein, we discuss the structures of TE module and illustrate the inter-diffusions across the interface of constituent layers. For Bi 2 Te 3 -based module, soldering is the primary bonding method, giving rise to the investigations on the selections of solder, diffusion barrier layer and electrode. For midtemperature PbTe-based TE module, hot-pressing or spark plasma sintering are alternative bonding approaches; the inter-diffusions between the diffusion barrier layer, electrode and TE substrate are addressed as well. ARTICLE HISTORY

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Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Moshwan

Yang

Zou

et al. 2017

Adv Funct Materials

352

260

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As a key type of emerging thermoelectric material, tin telluride (SnTe) has received extensive attention because of its low toxicity and eco-friendly nature. The recent trend shows that band engineering and nanostructuring can enhance thermoelectric performance of SnTe as intermediate temperature (400-800 K) thermoelectrics, which provides an alternative for toxic PbTe with the same operational temperature. This review highlights the key strategies to enhance the thermoelectric performance of SnTe materials through band engineering, carrier concentration optimization, synergistic engineering, and structure design. A fundamental analysis elucidates the underpinnings for the property improvement. This comprehensive review will boost the relevant research with a view to work on further performance enhancement of SnTe materials.where k B , e, h, m*, µ, and L are the Boltzmann constant, the carrier charge, the Planck's constant, the effective mass of the charge carrier, the carrier mobility, and the Lorenz number, respectively. As can be seen, S, σ, and κ e are interacted and conflict, which raises the difficulty to obtain high ZT. To solve these conflicts, extensive research has been carried out through band engineering to optimize S and σ, [5][6][7] and structuring to reduce the κ l . [8][9][10][11][12] Figure 1a summarizes recent significant achievements in different thermoelectric materials including SnSe, [25] 3%Na-(PbTe) 0.8 (PbS) 0.2 , [70] Cu 2 S 0.5 Te 0.5 , [71] and GeSbTe. [72] As can be seen, the current ZT values of the thermoelectric materials lie between 1 and 2, [7,[13][14][15][16][17][18][19][20][21][22][23] resulting in the fact that the current thermoelectric energy conversion efficiency is comparable to the other energy conversion technologies, such as photovoltaic cells, [22] and solar thermal plants. [22] Considerable research has been continuing to further drive ZT higher than 2 with the predicted efficiency over 20%, [24,25] which can attract highly exciting prospect in the energy generation and conservation fields.In terms of the industrial and automotive applications, waste heats are generally produced in the temperature range of 500-900 K. [26][27][28] To recover such waste heats, developing high-performance mid-temperature (400-900 K) thermoelectric materials is highly desired. For this purpose, lead telluride (PbTe) and its alloys have been considered as a primary material system. [7,10,14,17,29] However, the toxicity associated with Pb causes severe threat to the environment and needs to be alternated for domestic usage. [30] Hence, as its analog, tin telluride (SnTe) [21,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] with the rock-salt crystal structure has been inspired with great interests. [32] Especially, SnTe is nontoxic, earth-abundant, and environment friendly, [45] which makes it

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Improved thermoelectric properties of AgSbTe2 based compounds with nanoscale Ag2Te in situ precipitates

Cited by 60 publications

References 31 publications

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
15
0
12
0
View full text Add to dashboard Cite

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
15
0
12
0
View full text Add to dashboard Cite

Interfacial reactions in thermoelectric modules

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

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Improved thermoelectric properties of AgSbTe2 based compounds with nanoscale Ag2Te in situ precipitates

Cited by 60 publications

References 31 publications

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(Ma1, Delaire2, Specht3 et al. 2014Phys. Rev. B150120View full textAdd to dashboardCite

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(Ma1, Delaire2, Specht3 et al. 2014Phys. Rev. B150120View full textAdd to dashboardCite

Interfacial reactions in thermoelectric modules

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Contact Info

Product

Resources

About

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
15
0
12
0
View full text Add to dashboard Cite

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(
Ma
¹
,
Delaire
²
,
Specht
³

et al. 2014
Phys. Rev. B
15
0
12
0
View full text Add to dashboard Cite