Microstructure and Electrical Characterization of Thermoelectric Nanocrystalline Bi2 Te3 Synthesized by Mechanical Alloying

Kanta, Saikat Kumar; Paul, Shrabani; Chatterjee, Tuli; Dutta, Himadri Sekhar; Pradhan, S.K.

doi:10.1590/1980-5373-mr-2019-0328

Cited by 8 publications

(1 citation statement)

References 33 publications

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“…171 Bi 2 Te 3 nanoparticles were fabricated by a microwaveassisted chemical synthetic route with tartrate complexes Bi 3+ and Te 4+ . The nanoparticles exhibited a higher Seebeck coefficient (−135 μVK −1 ), lower thermal conductivity (0.957 W/mK), and a dimensionless figure of merit of 1.0 at 300 K. 172 The effect of microwave processing was examined to determine the optimal thermoelectric performance of (Bi x Sb 1−x ) 2 Te 3 /ethylene glycol 2964 (EG) alloy at room temperature. EG insertion enhanced the Seebeck coefficient, and a ZT of 1.2 was obtained at 300 K. 173 This technique was utilized in a comparative study of Bi 2−x Sb x Te 3 prepared by mechanochemical alloying and microwave (MW) synthesis routes, where a hexagonal platelet morphology was observed.…”

Section: Thermoelectric Propertiesmentioning

confidence: 99%

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

Hegde

Prabhu

2022

J. Electron. Mater.

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One of the global demands of primary research objectives is to achieve human energy harvesting and self-powered wearable technologies. Bismuth chalcogenides are the trending materials for thermoelectric generators and Peltier coolers due to their notable thermoelectric figure of merit in the low- and room-temperature range. Systematic alloying of bismuth chalcogenides leads to a substantial change in their electrical and thermal transport properties. The high thermoelectric figure of merit (ZT) observed in bismuth chalcogenides is due to the rhombohedral crystal structure, lower effective mass, low thermal conductivity, and large band degeneracy. This review is aimed at identifying and quantifying different techniques for effectively improving the thermoelectric properties of doped/composite bismuth chalcogenide compounds. The review also examines the various synthesis methods including ball milling (BM), spark plasma sintering (SPS), self-propagating high-temperature synthesis (SHS), soft chemical reaction, hydrothermal reaction, melt growth (MG), melt spinning (MS), sintering and consolidated synthesis, and hot extrusion, with their respective figures of merit. Since device modification is a challenging task, this report reviews the present research on bismuth chalcogenide alloys to benchmark future development using various techniques. Graphical Abstract

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Section: Thermoelectric Propertiesmentioning

confidence: 99%

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

Hegde

Prabhu

2022

J. Electron. Mater.

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Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration

Silva

Guimarães

Cano

et al. 2021

J Raman Spectroscopy

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The Raman and infrared (IR) active lattice vibrations of xMn‐concentration Bi2 − xMnxTe3 nanocrystals (NCs) as a dopant in semiconductor Bi2Te3 nanocrystals grown in a host glass matrix, whose symmetries correspond to the Rtrue3¯m−D3d5 space group, are investigated by Raman scattering. Transmission electron microscopy images confirm the formation of Bi2 − xMnxTe3 nanocrystals with an average size of around 5.4 nm. The observation of the six hyperfine structure lines in electron paramagnetic resonance spectra confirms the incorporation of Mn2+ ions in Bi2Te3 nanocrystals. The vibrational modes of quintuple layer (QL) of the diluted magnetic semiconductor Bi2 − xMnxTe3 nanocrystals are modified in relation to pure Bi2Te3 nanocrystals. The appearance of the A2u1 (95.5 cm−1), A2u2 (114 cm−1), and Eu2 (103 cm−1) IR‐active modes is mainly due to quantum size effects. Indeed, the redshifts of the A2u1 (95.5 cm−1), 0.25emEu2 (103 cm−1), Eg2 (110 cm−1), A2u2 (114 cm−1), and A1g2 (141 cm−1) vibrational modes give strong indications of the substitutional and interstitial incorporation of Mn2+ in the Bi2Te3 crystalline structure. In addition, the Raman spectra show the formation of Bi2OTe2 semiconductor due to the appearance of the (123 cm−1) mode. The investigation of the Bi2 − xMnxTe3 nanocrystal has promising potential to design new devices with magnetic and optical properties adjusted according to the xMn‐concentration.

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The role of Mn in Bi2-xMnxTe3 topological insulator: Structural, compositional, magnetic, and weak anti-localization property analysis

Kander

Biswas

Guchhait

et al. 2023

J Mater Sci: Mater Electron

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Microstructure and Electrical Characterization of Thermoelectric Nanocrystalline Bi2 Te3 Synthesized by Mechanical Alloying

Cited by 8 publications

References 33 publications

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration

The role of Mn in Bi2-xMnxTe3 topological insulator: Structural, compositional, magnetic, and weak anti-localization property analysis

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Microstructure and Electrical Characterization of Thermoelectric Nanocrystalline Bi2 Te3 Synthesized by Mechanical Alloying

Cited by 8 publications

References 33 publications

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

Study of vibrational properties of Bi2 − xMnxTe3 nanocrystals in host glass: Effect of xMn‐concentration

The role of Mn in Bi2-xMnxTe3 topological insulator: Structural, compositional, magnetic, and weak anti-localization property analysis

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Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration