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Enhanced thermoelectric performance of Bi2Se3-Bi2Te3 alloys prepared by mechanical alloying and hot pressing.

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Title: Enhanced thermoelectric performance of Bi2Se3-Bi2Te3 alloys prepared by mechanical alloying and hot pressing.
Authors: Deshmukh, Poonam1,2 (AUTHOR) poonamkhade06@gmail.com, Modi, Anchit3 (AUTHOR) anchitmodi87@gmail.com, Bagwaiya, Toshi2 (AUTHOR), Singh, Virendra Pratap4 (AUTHOR), Bhattacharya, Shovit5 (AUTHOR), Singh, Ajay5 (AUTHOR), Shelke, Vilas2 (AUTHOR)
Source: Materials Letters. Jan2026, Vol. 403, pN.PAG-N.PAG. 1p.
Subjects: Thermoelectric materials, Alloys, Mechanical alloying, Electric conductivity, Hot pressing, Electric power factor, Bismuth selenide, Thermoelectricity
Abstract: • Bi 2 Te 3 -Bi 2 Se 3 composites were made by mechanical alloying and hot-press sintering. • Alloying and reduced crystallite size enhance electrical conductivity significantly. • Improved power factor and ZT confirm enhanced thermoelectric properties in composites. In this study, 3D topological materials Bi 2 Te 3 , Bi 2 Se 3 , and their nominal alloys (1–x)Bi 2 Te 3 - (x)Bi 2 Se 3 (x = 0, 0.2, 0.3, 0.5, 1.0) were synthesized via mechanical alloying and hot-press sintering to investigate charge carrier transport. Rietveld refinement confirmed rhombohedral (R-3 m) symmetry in the pure phases, while Raman analysis revealed that acoustic phonon scattering significantly influences charge carrier transport at high temperatures. The alloys showed up to threefold higher conductivity, likely from alloying, defects, and interfaces, enhancing the power factor and thermoelectric performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Bi 2 Te 3 -Bi 2 Se 3 composites were made by mechanical alloying and hot-press sintering. • Alloying and reduced crystallite size enhance electrical conductivity significantly. • Improved power factor and ZT confirm enhanced thermoelectric properties in composites. In this study, 3D topological materials Bi 2 Te 3 , Bi 2 Se 3 , and their nominal alloys (1–x)Bi 2 Te 3 - (x)Bi 2 Se 3 (x = 0, 0.2, 0.3, 0.5, 1.0) were synthesized via mechanical alloying and hot-press sintering to investigate charge carrier transport. Rietveld refinement confirmed rhombohedral (R-3 m) symmetry in the pure phases, while Raman analysis revealed that acoustic phonon scattering significantly influences charge carrier transport at high temperatures. The alloys showed up to threefold higher conductivity, likely from alloying, defects, and interfaces, enhancing the power factor and thermoelectric performance. [ABSTRACT FROM AUTHOR]
ISSN:0167577X
DOI:10.1016/j.matlet.2025.139486