Low temperature thermoelectric properties of PbTe–CoSb3 composites

Chubilleau, Caroline; Lenoir, Bertrand; Dauscher, A.; Godart, C.

doi:10.1016/j.intermet.2011.10.023

Cited by 18 publications

(13 citation statements)

References 60 publications

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“…All samples exhibit a relative density higher than 98 %, showing no influence with respect to the content of nanoparticles included [28].…”

Section: Methodsmentioning

confidence: 93%

“…Laser fragmentation, using a pulsed Nd:YAG laser (Continuum Powerlite Precision 8000, repetition rate = 10 Hz, output energy: 400 mJ, pulse duration: 7s, wavelength: 1064 nm), of micron-sized PbTe powders in water has been applied to produce nanosized (average diameter 6 nm) PbTe particles following a process described in detail in [26][27][28]. Powders have been collected after water removal by freeze-drying (FTS system EZ585, 17 mTorr, -80 °C) during seven days.…”

Section: Methodsmentioning

confidence: 99%

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High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

et al. 2012

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International audienceNanostructured thermoelectric materials generally exhibit enhanced properties. PbTe-CoSb3 thermoelectric composites (0-8 wt% of PbTe) have been successfully prepared by freeze-drying nanoparticles of PbTe (6 nm in diameter, synthesized by laser fragmentation of micron-sized particles in water) with micron-sized skutterudite CoSb3 powders (similar to 5 mu m in diameter, synthesized by powder metallurgy), followed by spark plasma sintering. X-ray diffraction analyses and scanning electron microscopy observations have been performed. Microstructures reveal an agglomeration of the PbTe particles at the grain boundaries of CoSb3. Electrical resistivity, thermopower, and thermal conductivity measurements have been performed in the 300-800 K temperature range. The composites exhibit n-type conduction whereas the reference CoSb3 skutterudite is p-type. This change of conduction mode is attributed to substitution of Sb for a minute amount of Te in the composites. The influence of both PbTe nanoparticules and Te on the thermoelectric properties is discussed in detail

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“…All samples exhibit a relative density higher than 98 %, showing no influence with respect to the content of nanoparticles included [28].…”

Section: Methodsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

et al. 2012

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“…The electron is not easy to be scattered because of the size of the nanoscale second-phase is much larger than the mean free path of the electron, which has little effect on the electrical properties. The preparation of CoSb 3 -based nanocomposites by in-situ generation [78,[167][168][169][170][171][172][173][174][175][176][177] or mechanical addition of nanoinclusions [178][179][180][181][182][183][184][185][186][187][188][189][190][191][192][193] is a common method to introduce the second phase. In x Ce y Co 4 Sb 12 nanocomposites containing in-situ formed InSb nanophases (10-80 nm) were prepared by melt quenching, annealing, and spark plasma sintering [78], as shown in Figs.…”

Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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The binary skutterudite CoSb3 is a narrow bandgap semiconductor thermoelectric (TE) material with a relatively flat band structure and excellent electrical performance. However, thermal conductivity is very high because of the covalent bond between Co and Sb, resulting in a very low ZT value. Therefore, researchers have been trying to reduce its thermal conductivity by the different optimization methods. In addition, the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb3 material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering mechanism. This review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb3-based materials at atomic-molecular scale and nano-mesoscopic scale. We also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb3-based materials and synergistic optimization of the electrical and thermal transport parameters. In addition, the research progress of CoSb3-based TE devices in recent years is also briefly discussed.

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“…A similar observation has been reported in CoSb 3 -PbTe composites. 26 Fig. 8 shows the temperature dependence of the Hall mobility.…”

Section: Structural Characterizationmentioning

confidence: 99%

A study of Yb_0.2Co₄Sb₁₂–AgSbTe₂nanocomposites: simultaneous enhancement of all three thermoelectric properties

Peng

Liu

et al. 2014

J. Mater. Chem. A

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The single-filled skutterudite Yb 0.2 Co 4 Sb 12 has been long known as a promising bulk thermoelectric material. In this work, we adopted a melting-milling-hot pressing procedure to prepare nanocomposites that consist of a micrometer-grained Yb 0.2 Co 4 Sb 12 matrix and well-dispersed AgSbTe 2 nanoinclusions on the matrix grain boundaries. Different weight percentages of AgSbTe 2 inclusions were added to optimize the thermoelectric performance. We found that the addition of AgSbTe 2 nanoinclusions systematically and simultaneously optimized the otherwise adversely inter-dependent electrical conductivity, Seebeck coefficient and thermal conductivity. In particular, the significantly enhanced carrier mobility led to a $3-fold reduction of the electrical resistivity. Meanwhile the absolute value of Seebeck coefficient was enhanced via the energy filtering effect at the matrix-nanoinclusion interfaces. Moreover there is a topological crossover of the AgSbTe 2 inclusions from isolated nanoparticles to a nano-plating or nano-coating between 6 wt% and 8 wt% of nanoinclusions. Above the crossover, further addition of nanoinclusions degraded the Seebeck coefficient and the electrical conductivity. Meanwhile, the addition of nanoinclusions generally reduced the lattice thermal conductivity. As a result, the power factor of the 6 wt% sample was $7 times larger than that of the nanoinclusion-free sample, yielding a room temperature figure of merit ZT $ 0.51.

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Low temperature thermoelectric properties of PbTe–CoSb3 composites

Cited by 18 publications

References 60 publications

High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

A review of CoSb3-based skutterudite thermoelectric materials

A study of Yb_0.2Co₄Sb₁₂–AgSbTe₂nanocomposites: simultaneous enhancement of all three thermoelectric properties

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Low temperature thermoelectric properties of PbTe–CoSb3 composites

Cited by 18 publications

References 60 publications

High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

High temperature thermoelectric properties of CoSb3 skutterudites with PbTe inclusions

A review of CoSb3-based skutterudite thermoelectric materials

A study of Yb0.2Co4Sb12–AgSbTe2nanocomposites: simultaneous enhancement of all three thermoelectric properties

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A study of Yb_0.2Co₄Sb₁₂–AgSbTe₂nanocomposites: simultaneous enhancement of all three thermoelectric properties