Structural and Electrical Properties Characterization of Sb<sub>1.52</sub>Bi<sub>0.48</sub>Te<sub>3.0</sub> Melt-Spun Ribbons - Université de Lorraine Access content directly
Journal Articles Crystals Year : 2017

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

Viktoriia Ohorodniichuk
Anne Dauscher
Sylvie Migot
Christophe Candolfi
Bertrand Lenoir
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Abstract

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 Sb1.52Bi0.48Te3.0 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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hal-03984225 , version 1 (12-02-2023)

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Viktoriia Ohorodniichuk, Anne Dauscher, Elsa Branco Lopes, Sylvie Migot, Christophe Candolfi, et al.. Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons. Crystals, 2017, 7 (6), pp.172. ⟨10.3390/cryst7060172⟩. ⟨hal-03984225⟩
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