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Journal of Materials Science: Materials in Electronics

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13.03.2021

Microstructure and thermoelectric performance evaluation of p-type (Bi, Sb)₂Te₃ materials synthesized using mechanical alloying and spark plasma sintering process

verfasst von: Hamta Mansouri, Seyed Abdolkarim Sajjadi, Abolfazl Babakhani, Yasaman Saberi

Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 8/2021

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Abstract

In this paper, three p-type thermoelectric compounds, namely Bi_0.5Sb_1.5Te₃, Bi_0.3Sb_1.7Te₃, and Bi_0.2Sb_1.8Te₃ were manufactured by mechanical milling and spark plasma sintering method. The effects of chemical composition on microstructural and thermoelectric properties were investigated. In this order, Bi, Te, and Sb powders with different contents were mechanically milled for 6 hours. Then, they were consolidated using a spark plasma sintering process (SPS) at 400 °C under 60 MPa pressure. The phase composition was analyzed using XRD with Cu-Kα radiation. The microstructural characterization of the specimens was performed using scanning electron microscopy. Moreover, thermoelectric properties of the samples, including the Seebeck coefficient, electrical and thermal conductivity, power factor, and ZT were determined. Analysis of XRD patterns of fabricated compositions indicated that a single phase with a rhombohedral lattice structure was synthesized in all conditions. In addition, SEM results showed an integrated structure with a few scattered micropores. The thermoelectric results confirmed that Bi_0.5Sb_1.5Te₃ demonstrates the lowest thermal conductivity (0.85 W/m K), the highest electrical conductivity (4.48 S/cm), and the maximum figure of merit (1.03 × 10⁻²) at room temperature. Therefore, it is the best option among the fabricated compounds to be utilized as thermoelectric materials.

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Titel: Microstructure and thermoelectric performance evaluation of p-type (Bi, Sb)2Te3 materials synthesized using mechanical alloying and spark plasma sintering process
verfasst von: Hamta Mansouri
Seyed Abdolkarim Sajjadi
Abolfazl Babakhani
Yasaman Saberi
Publikationsdatum: 13.03.2021
Verlag: Springer US
Erschienen in: Journal of Materials Science: Materials in Electronics / Ausgabe 8/2021
Print ISSN: 0957-4522
Elektronische ISSN: 1573-482X
DOI: https://doi.org/10.1007/s10854-021-05645-8

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