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Unveiling the thermoelectric potential of perthioborate MBS₃(M = Rb;Cs) compounds: insights from DFT calculations

Author

Listed:
  • Garadi Fatima

    (Amar Telidji University)

  • Said Maabed

    (Amar Telidji University)

  • Hanifi Mebarki

    (Amar Telidji University)

  • Mohamed Halit

    (Amar Telidji University)

  • Chérif F. Matta

    (Mount Saint Vincent University)

  • Lamin Ben Kamri Ahmed

    (Université Amar Telidji de Laghouat)

Abstract

This study presents a thorough theoretical investigation of perthioborate MBS₃ (M = Rb, Cs), a type of chalcogenometallate structure, using density functional theory to evaluate their suitability for thermoelectric applications. We examine the interconnections among their electronic, elastic, and thermoelectric properties. Electronic structure calculations reveal that these materials possess an indirect bandgap equal to 1.9 eV for M = Rb and 2.1 eV for M = Cs. Both RbBS₃ and CsBS₃ display low elastic constants, enhanced phonon anharmonicity and reduced thermal conductivity, which positions them as promising candidates for thermoelectric use. They also exhibit a substantial Seebeck coefficient and excellent electrical conductivity, especially along the zz direction, with values surpassing 400,000 Ω⁻1m⁻1 at 300 K. Within the temperature range of 400 K to 600 K, both materials demonstrate a high figure of merit close to 1. These theoretical insights highlight the promising potential of perthioborate materials for high-performance thermoelectric applications. Graphical abstract

Suggested Citation

  • Garadi Fatima & Said Maabed & Hanifi Mebarki & Mohamed Halit & Chérif F. Matta & Lamin Ben Kamri Ahmed, 2025. "Unveiling the thermoelectric potential of perthioborate MBS₃(M = Rb;Cs) compounds: insights from DFT calculations," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 98(3), pages 1-13, March.
    • Handle: RePEc:spr:eurphb:v:98:y:2025:i:3:d:10.1140_epjb_s10051-025-00896-4
    DOI: 10.1140/epjb/s10051-025-00896-4
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    References listed on IDEAS

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    1. Enescu, Diana & Virjoghe, Elena Otilia, 2014. "A review on thermoelectric cooling parameters and performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 903-916.
    2. Li-Dong Zhao & Shih-Han Lo & Yongsheng Zhang & Hui Sun & Gangjian Tan & Ctirad Uher & C. Wolverton & Vinayak P. Dravid & Mercouri G. Kanatzidis, 2014. "Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals," Nature, Nature, vol. 508(7496), pages 373-377, April.
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