Morphology and nanostructured features in BiSbTe and BiSeTe solid solutions obtained by hot extrusion

Kozhemyakin, G. N.; Belov, Yu. S.; Parashenko, A.N.; Артемов, В. В.; Soklakova, O. N.

doi:10.1016/j.mseb.2021.115270

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…(Bi 1− x Se x ) 2 Te 3 and (Bi 1− x Sb x ) 2 Te 3 crystals have a nanocrystalline structure consisting of voids and fibers with different orientations, respectively. 33 Wherefore, these crystals had higher SPD values than Bi and Sb single crystals, although they all are TIs with strong spin-orbit interactions (SOI). The imperfect crystal structure with high resistivity in the solid solutions studied increases charge carrier scattering in the bulk, which can promote higher surface carrier transport (Table 1).…”

Section: Resultsmentioning

confidence: 98%

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Photovoltaic effect in metal foils and crystals of topological insulators

2023

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Section: Resultsmentioning

confidence: 98%

“…1d). 33 Bi, Sb, Te, and Se of 99.99% purity were used as source materials. These solid solutions were nanostructured rods with a 1.6 mm diameter.…”

Section: Methodsmentioning

confidence: 99%

Photovoltaic effect in metal foils and crystals of topological insulators

2023

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“…The semiconductors of group V–VI, exhibiting narrow band gaps, such as Bi 2 Te 3 -, Bi 2 Se 3 -, and Sb 2 Te 3 -based alloys, are widely used for TE devices with high ZT value within the temperature range of 200 to 400 K [ 18 , 25 , 26 , 27 , 28 , 29 , 30 ]. Bi 2 Te 3 , Bi 2 Se 3 , Sb 2 Te 3 , and their alloys crystallize in a rhombohedral structure belonging to the tetradymite space group

, as shown in Figure 1 a [ 31 , 32 , 33 ].…”

Section: Inorganic Te Fibermentioning

confidence: 99%

New Progress on Fiber-Based Thermoelectric Materials: Performance, Device Structures and Applications

et al. 2021

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With the rapid development of wearable electronics, looking for flexible and wearable generators as their self-power systems has proved an extensive task. Fiber-based thermoelectric generators (FTEGs) are promising candidates for these self-powered systems that collect energy from the surrounding environment or human body to sustain wearable electronics. In this work, we overview performances and device structures of state-of-the-art fiber-based thermoelectric materials, including inorganic fibers (e.g., carbon fibers, oxide fibers, and semiconductor fibers), organic fibers, and hybrid fibers. Moreover, potential applications for related thermoelectric devices are discussed, and future developments in fiber-based thermoelectric materials are also briefly expected.

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“…Bismuth and antimony chalcogenides have a rhombohedral structure with the R3m symmetry group, and their physical properties are anisotropic [4]. Their parameters, such as their electrical conductivity and heat conductivity in the direction of the third order symmetry axis and in directions perpendicular to this axis, may differ by several times (hence the anisotropy of the thermoelectric figure of merit) [5].…”

Section: Introductionmentioning

confidence: 99%

Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion

et al. 2021

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In this study, Ingots of (Bi, Sb)2Te3 thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)2Te3 solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)2Te3 thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10−3 K−1).

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Morphology and nanostructured features in BiSbTe and BiSeTe solid solutions obtained by hot extrusion

Cited by 6 publications

References 27 publications

Photovoltaic effect in metal foils and crystals of topological insulators

Photovoltaic effect in metal foils and crystals of topological insulators

New Progress on Fiber-Based Thermoelectric Materials: Performance, Device Structures and Applications

Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion

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