Thermoelectric properties of (BixSb1−x)2Te3 single crystal solid solutions grown by the T.H.M. method

Caillat, T.; Carle, M.; Pierrat, Philippe; Scherrer, H.; Scherrer, S.

doi:10.1016/0022-3697(92)90087-t

Cited by 159 publications

(116 citation statements)

References 13 publications

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“…Several synthesis techniques were used in the past to prepare these compounds either in single or bulk polycrystalline form [17][18][19][20][21][22][23][24][25]. Polycrystals are traditionally fabricated using the zone melting method, powder metallurgy techniques or mechanical alloying, followed by a consolidation step [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons

et al. 2017

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Melt-spinning (MS) has been reported as a promising tool to tailor the microstructure of bulk thermoelectric materials leading to enhanced thermoelectric performances. Here, we report on a detailed characterization of p-type Bi 0.48 Sb 1.52 Te 3 ribbons produced by melt-spinning. The microstructure of the melt-spun ribbons has been studied by means of X-ray diffraction, scanning and transmission electron microscopy (TEM). The analyses indicate that the ribbons are highly-textured with a very good chemical homogeneity. TEM reveals clear differences in the microstructure at large and short-range scales between the surface that was in contact with the copper wheel and the free surface. These analyses further evidence the absence of amorphous regions in the melt-spun ribbons and the precipitation of elemental Te at the grain boundaries. Low-temperature electrical resistivity and thermopower measurements (20-300 K) carried out on several randomly-selected ribbons confirm the excellent reproducibility of the MS process. However, the comparison of the transport properties of the ribbons with those of bulk polycrystalline samples of the same initial composition shows that MS leads to a more pronounced metallic character. This difference is likely tied to changes in deviations from stoichiometry due to the out-of-equilibrium conditions imposed by MS.

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Section: Introductionmentioning

confidence: 99%

Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons

et al. 2017

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“…This is an essential simplification for our modeling of Sb 2 Te 3 , for which we were unable to locate temperaturedependent thermal conductivity measurements from the literature. 38 Table II, along with other property values used in this work.…”

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confidence: 99%

Effective thermal conductivity of polycrystalline materials with randomly oriented superlattice grains

Yang

Ikeda

Snyder

et al. 2010

Journal of Applied Physics

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A model has been established for the effective thermal conductivity of a bulk polycrystal made of randomly oriented superlattice grains with anisotropic thermal conductivity. The in-plane and cross-plane thermal conductivities of each superlattice grain are combined using an analytical averaging rule that is verified using finite element methods. The superlattice conductivities are calculated using frequency dependent solutions of the Boltzmann transport equation, which capture greater thermal conductivity reductions as compared to the simpler gray medium approximation. The model is applied to a PbTe/ Sb 2 Te 3 nanobulk material to investigate the effects of period, specularity, and temperature. The calculations show that the effective thermal conductivity of the polycrystal is most sensitive to the in-plane conductivity of each superlattice grain, which is generally four to five times larger than the cross-plane conductivity of a grain. The model is compared to experimental measurements of the same system for periods ranging from 287 to 1590 nm and temperatures from 300 to 500 K. The comparison suggests that the effective specularity increases with increasing annealing temperature and shows that these samples are in a mixed regime where both Umklapp and boundary scattering are important.

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“…Thermoelectric power factor (S 2 ) values up to 50 µW/K 2 cm, which is comparable for Bi 2 Te 3 crystals [49] are reported, demonstrating that the electronic properties are comparable with traditional thermoelectric materials. However, currently the thermoelectric performance of Na x CoO 2 single crystals is limited due to the relatively high thermal conductivity (8-19 W/mK) [50][51][52], which is significantly higher than for Bi 2 Te 3 crystals (1 W/mK) [49]. In addition to Na x CoO 2 , also other cobaltates, such as Ca 3 Co 4 O 9 and Bi 2 Sr 2 Co 2 O y , with related crystal structures, were studied for their thermoelectric properties and they also show similarly interesting thermoelectric properties.…”

Section: Cobaltatesmentioning

confidence: 64%

“…The lattice parameters a (0.4834 nm), c (1.084 nm) and (98.14 ) are shared for the two sublattice systems, in contrast to the b-axis lattice parameter, which are 0.2824 nm and 0.4558 nm for respectively the CoO 2 and the Ca 2 CoO 3 sublattices. [53,63] [49]. This remarkable high thermoelectric power factor at 300K is obtained, because of a simultaneous high Seebeck coe cient of 100 µV/K and low resistivity of 0.2 m⌦cm.…”

Section: Cobaltate Structural Propertiesmentioning

confidence: 86%

“…[48,69] As previously mentioned, the electronic properties of Na x CoO 2 single crystals at room temperature are comparable to that of Bi 2 Te 3 crystals. However, currently the ZT value of Na x CoO 2 crystals is limited due to the relatively high thermal conductivity (8-19 W/mK) [50][51][52], which is significantly higher than for Bi 2 Te 3 crystals (⇠1 W/mK) [49]. For single crystals, ZT values of about 0.03 at 300K are obtained, which increases to 1.2 at 800K, showing the high-temperature potential of oxide thermoelectrics.…”

Section: Cobaltate Structural Propertiesmentioning

confidence: 99%

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Size effects in thermoelectric cobaltate heterostructures

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Thermoelectric properties of (BixSb1−x)2Te3 single crystal solid solutions grown by the T.H.M. method

Cited by 159 publications

References 13 publications

Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons

Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons

Effective thermal conductivity of polycrystalline materials with randomly oriented superlattice grains

Size effects in thermoelectric cobaltate heterostructures

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