Measurements of the energy band gap and valence band structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>AgSbTe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Jovovic, Vladimir; Heremans, Joseph P.

doi:10.1103/physrevb.77.245204

Cited by 118 publications

(113 citation statements)

References 25 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: 78%

“…in κ tot with T can be accounted for by the electron, hole, and ambipolar terms in κ el , as reported by Jovovic et al 10 As a result, κ lat is weakly dependent on T , with κ lat 0. was also confirmed with differential scanning calorimetry. In addition, composition maps from electron-microprobe analysis show that most of the Ag 2 Te secondary phase segregates into lamellae at the end of the ingot from eutectic decomposition 24,32 .…”

Section: Discussionmentioning

confidence: 75%

“…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] .…”

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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0
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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: 78%

Section: Discussionmentioning

confidence: 75%

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
13
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12
0
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“…The p-type behavior of the AgSbTe 2 phase is consistent with the previous studies. 48 If the p-type behavior can be attributed to Ag vacancies 49 or Sb À3 occupying the Te À2 sites, it is likely that the hole concentration decreases as the composition varies closer to the PbTe-AgSbTe 2 line leading to the increase in the Seebeck coefficient. The maximum positive value is 470 mV K À1 at 16 mol% Pb.…”

Section: 34mentioning

confidence: 99%

A combinatorial approach to microstructure and thermopower of bulk thermoelectric materials: the pseudo-ternary PbTe–Ag2Te–Sb2Te3 system

Ikeda

Iwanaga

et al. 2012

J. Mater. Chem.

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The microstructures and Seebeck coefficients of thermoelectric alloys in the pseudo-ternary PbTeAg 2 Te-Sb 2 Te 3 system were examined using samples that were compositionally graded by unidirectional solidification by the Bridgman method and diffusion couples. At compositions near the middle of the pseudo-binary PbTe-AgSbTe 2 line, a compositionally modulated microstructure has been found. From diffusion couple experiments, it is found that the PbTe-AgSbTe 2 system exhibits a miscibility gap at low temperatures while it forms a complete solid solution at high temperatures; the critical temperature is between 400 C and 450 C. The modulated microstructure originates from the decomposition of the high-temperature solid solution during cooling. Scanning Seebeck coefficient measurement on these samples covers a wide compositional space of the pseudo-ternary system. The Seebeck coefficient transitions from positive values at AgSbTe 2 -rich compositions to negative values at PbTe-rich compositions on the pseudo-binary PbTe-AgSbTe 2 line. Composition-graded samples prepared by the Bridgman method are thus useful to investigate thermoelectric materials in multicomponent systems.

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Thermoelectric Materials

Owens‐Baird

Heinrich

Kovnir

2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The field of thermoelectric materials has flourished over the last two decades. Significant successes achieved in the development of materials notwithstanding, novel and highly efficient materials are in steep demand due to a wide range of potential and current applications, ranging from wearable electronics to space missions. The main challenge in the improvement of the thermoelectric figure of merit ( zT ) is to optimize the intertwined intrinsic charge and thermal transport properties. High electrical conductivity and thermopower, along with low thermal conductivity, need to be achieved simultaneously to excel the thermoelectric efficiency. In this review, the thermoelectric concepts, basics of transport properties, and strategies for zT optimization are discussed in the first section. In the following sections, the predominate structure types associated with high‐performance bulk thermoelectric materials are discussed in detail: Bi 2 Te 3 , PbTe, TAGS/LAST systems, SnSe, Cu 2− x Se, chalcopyrites, tetrahedrites, clathrates, skutterudites, zinc antimonides, Yb 14 MnSb 11 , Heusler and half‐Heusler intermetallics. The basic crystal structures, the possibilities for doping and substitutions to adjust charge carrier concentration and thermal conductivity, baseline thermoelectric properties, and strategies for efficiency improvement are considered for each structure type. Examples of recent work highlighting these strategies are briefly presented.

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Measurements of the energy band gap and valence band structure ofAgSbTe2

Cited by 118 publications

References 25 publications

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

et al. 2014
Phys. Rev. B
13
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
13
0
12
0
View full text Add to dashboard Cite

A combinatorial approach to microstructure and thermopower of bulk thermoelectric materials: the pseudo-ternary PbTe–Ag2Te–Sb2Te3 system

Thermoelectric Materials

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Measurements of the energy band gap and valence band structure ofAgSbTe2

Cited by 118 publications

References 25 publications

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(Ma1, Delaire2, Specht3 et al. 2014Phys. Rev. B130120View full textAdd to dashboardCite

Phonon scattering rates and atomic ordering inAg1−xSb1+xTe2+x(Ma1, Delaire2, Specht3 et al. 2014Phys. Rev. B130120View full textAdd to dashboardCite

A combinatorial approach to microstructure and thermopower of bulk thermoelectric materials: the pseudo-ternary PbTe–Ag2Te–Sb2Te3 system

Thermoelectric Materials

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
13
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
13
0
12
0
View full text Add to dashboard Cite