High entropy phenomena induced low thermal conductivity in BiSbTe1.5Se1.5 thermoelectric alloy through mechanical alloying and spark plasma sintering

Raphel, Arun; Vivekanandhan, P.; Kumaran, S.

doi:10.1016/j.matlet.2020.127672

Cited by 32 publications

(14 citation statements)

References 8 publications

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“…The texturing effect on the thermoelectric properties has not been discussed in Refs. [15,16]. Besides, Ag-doping effect on the thermoelectric properties of the BiSbTe 1.5 Se 1.5 alloy was found in Ref.…”

Section: Resultsmentioning

confidence: 84%

“…This value is in agreement with data reported in Refs. [15,16]. The bulk samples happened to be textured.…”

Section: Resultsmentioning

confidence: 99%

“…The lowest value of the lattice thermal conductivity, k p min , and the highest value of the thermoelectric figure-of-merit, ZT max , observed for the BiSbTe 1.5 Se 1.5 alloy in present work and also reported in Refs. [15,16], are collected in Table 1. The texturing effect on the thermoelectric properties has not been discussed in Refs.…”

Section: Resultsmentioning

confidence: 99%

“…At present, direct way to develop these materials is based on applying known thermoelectric compound taken as some starting material, which can be transformed into the high-entropy and medium-entropy alloy. In accordance with this approach, bismuth telluride, Bi 2 Te 3 , was successfully applied as the starting material to develop both high-entropy (BiSbTe 1.5 Se 1.5 ) 1-x Ag x and medium-entropy BiSbTe 1.5 Se 1.5 alloys [15,16]. The bismuth telluride itself is widely applied to prepare n-Bi 2 Te 3-x Se x and p-Bi 2-x Sb x Te 3 alloys for low-temperature thermoelectric applications [17,18].…”

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Microstructure and thermoelectric properties of the medium-entropy block-textured BiSbTe1.5Se1.5 alloy

Ivanov

Yaprintsev

Vasil’ev

et al. 2021

Journal of Alloys and Compounds

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Medium-entropy BiSbTe 1.5 Se 1.5 alloy has been prepared by self-propagating high-temperature synthesis (to prepare a starting powder with desired composition and structure) and spark plasma sintering (to prepare block-textured samples). Under texturing, a partial ordering of grains, which is typical for Bi 2 Te 3 -based alloys, takes place resulting in forming a lamellar grain structure. Lamellar sheets are not continuous for whole volume of the textured sample. There are blocks with continuous lamellar sheets of some definite orientation, but the orientations of the sheets in neighboring blocks are different from each other. Forming the block-textured structure can be related to specific features of the starting powder, applied to sinter the bulk samples. The starting powder was strongly inhomogeneous and particles in the starting powder were rather big and shape-isotropic. As result, the texturing can be initiated in local domains of volume independently from each other resulting in forming the blocks with different preferential grains orientation. Due to the block texturing, the thermoelectric properties of the BiSbTe 1.5 Se 1.5 alloy, measured perpendicularly or parallel to a texturing axis, are different. Many features, found in these properties, are typical for textured Bi 2 Te 3 -based alloys. The thermoelectric properties of the medium-entropy block-textured BiSbTe 1.5 Se 1.5 alloy can be believed to be promising enough. The highest thermoelectric figure-of-merit equal to ~0.43 was observed for the perpendicular measuring orientation. This alloy can be next applied as a precursor for developing five-or six-element high-entropy alloys with enhanced thermoelectric efficiency.

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Section: Resultsmentioning

confidence: 84%

“…This value is in agreement with data reported in Refs. [15,16]. The bulk samples happened to be textured.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Microstructure and thermoelectric properties of the medium-entropy block-textured BiSbTe1.5Se1.5 alloy

Ivanov

Yaprintsev

Vasil’ev

et al. 2021

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…Recent efforts have focused on introducing nanostructures, such as nanoparticles (NPs), nanowires (NWs), nanoporous media, and nanocomposites, which are easily capable of forming numerous grain boundaries, into bulk TE materials [12][13][14][15][16][17]. Among a variety of routes for introducing nanostructures into bulk TE materials, the mechanochemical process (MCP) is an effective approach to obtain alloy NPs from elemental precursors by self-ignition and propagation reaction during high-energy ball milling under dry conditions [18][19][20][21][22][23]. Thus, this method is advantageous for designing TE materials because of the facile fabrication process that facilitates large-scale TE NP production, wherein the NPs serve to provide smaller grain sizes and larger grain boundaries for lower κ l values.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Uniformly Sized Bi0.5Sb1.5Te3.0 Nanoparticles via Mechanochemical Process and Wet-Milling for Reduced Thermal Conductivity

et al. 2021

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In this study, Bi0.5Sb1.5Te3.0 (BST) nanoparticles (NPs) with high crystallinities were synthesized via a mechanochemical process (MCP). X-ray diffraction (XRD), and Raman and X-ray photoelectron spectroscopy (XPS) spectra of the BST NPs showed that the Bi, Sb, and Te powders successfully formed BiSbTe phase and transmission electron microscopy (TEM) images, verifying the high crystallinity and smaller size, albeit agglomerated. The as-synthesized BST NPs with agglomerated clusters were ground into smaller sizes of approximately 41.8 nm with uniform distribution through a simple wet-milling process during 7 days. The thermal conduction behaviors of bulk alloys fabricated by spark plasma sintering (SPS) of the BST NPs were studied by comparing those of samples fabricated from as-synthesized BST NPs and a BST ingot. The thermal conductivities (κ) of the BST nanocomposites were significantly reduced by introducing BST NPs with smaller grain sizes and finer distributions in the temperature range from 300 to 500 K. The BST nanocomposites fabricated from wet-milled BST NPs offered ultralow κ values of 0.84 W m−1 K−1 at approximately 398 K.

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Tuning p-type semiconduction with ultra-low thermal conductivity in nanocrystalline n-type BiSbTe1. 5Se1.5 high entropy alloy via Ag doping

Raphel,

Vivekanandhan,

Kumaran

2024

Appl. Phys. A

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High entropy phenomena induced low thermal conductivity in BiSbTe1.5Se1.5 thermoelectric alloy through mechanical alloying and spark plasma sintering

Cited by 32 publications

References 8 publications

Microstructure and thermoelectric properties of the medium-entropy block-textured BiSbTe1.5Se1.5 alloy

Microstructure and thermoelectric properties of the medium-entropy block-textured BiSbTe1.5Se1.5 alloy

Synthesis of Uniformly Sized Bi0.5Sb1.5Te3.0 Nanoparticles via Mechanochemical Process and Wet-Milling for Reduced Thermal Conductivity

Tuning p-type semiconduction with ultra-low thermal conductivity in nanocrystalline n-type BiSbTe1. 5Se1.5 high entropy alloy via Ag doping

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