Rapid fabrication of Se-modified skutterudites obtained via self-propagating high-temperature synthesis and pulse plasma sintering route. Issue 6 (15th March 2023)

• Record Type: Journal Article
• Authors: Kruszewski, M.J.; Kot, M.; Cymerman, K.; Chmielewski, M.; Moszczyńska, D.; Małek, M.; Ciupiński, Ł.
• Is Part Of: Ceramics international. Volume 49:Issue 6(2023)
• Page Start: 9560
• Page End: 9565
• Publication Date: 2023-03-15
• Subjects: Self-propagating high-temperature synthesis (SHS) -- Pulse plasma sintering (PPS) -- Thermoelectric materials -- Skutterudites; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.11.124
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Selenium is an effective dopant in skutterudite-based thermoelectric materials. It strongly influences thermal transport properties due to effective phonon scattering. This study proposes a short-term fabrication route to Se-modified CoSb3 -based materials. Alloy synthesis was conducted via self-propagating high-temperature synthesis. Subsequently, pulse plasma sintering consolidated all materials. As a result, thermoelectric materials with high electrical properties homogeneity were obtained. Seebeck potential mapping showed the measured deviation of the Seebeck coefficient for all fabricated samples was between 5 and 7%. A very low thermal conductivity (1.59 W m −1 K −1, at 573 K) was achieved for the highest doped sample, and one of the lowest reported results obtained for bulk skutterudite-based thermoelectric materials ever. This resulted in a low lattice thermal conductivity (1.51 W m −1 K −1, at 573 K). This led to the highest ZT (0.27 at 623 K) for the highest doped sample.