Thermoelectric transport properties of double-filling InxLa0.25Co4Sb12 skutterudite materials

Bashir, Mohamed Bashir Ali and Salih, Ethar Yahya and Mohd Said, Suhana and Miyazaki, Yuzuru and Shnawah, Dhafer Abdul-Ameer and Bashir, M. Nasir and Sajid, Imran Haider and Elsheikh, Mohamed Hamid (2023) Thermoelectric transport properties of double-filling InxLa0.25Co4Sb12 skutterudite materials. Journal of Electronic Materials, 52 (2, SI). pp. 971-979. ISSN 0361-5235, DOI

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Filled-skutterudite materials are promising candidates for thermoelectric applications in the intermediate-temperature range to recover waste heat. In this work, mechanical alloying and spark plasma sintering (SPS) techniques were used to consolidate double-filling InxLa0.25Co4Sb12 (x = 0, 0.1, 0.3, 0.5) samples. X-ray diffraction, scanning electron microscopy, and energy-dispersive x-ray spectroscopy were used to analyze the microstructure of the InxLa0.25Co4Sb12 SPS-ed samples. The microstructure results revealed the main phase of the CoSb3 skutterudite structure with a small amount of InSb and CoSb2 attributed to secondary phases. Electrical resistivity remarkably decreased to 9.7 mu omega m at room temperature for the In0.5La0.25Co4Sb12 sample, mainly due to the effective impurity of the InSb nanoinclusions. Moreover, the InSb nanoinclusions yielded a substantial depression in lattice thermal conductivity due to phonon scattering. The reduction in lattice thermal conductivity was approximately 62% for the In0.5La0.25Co4Sb12 sample compared with the La0.25Co4Sb12 sample, resulting in a remarkable enhancement in the dimensionless figure-of-merit (ZT) of 1.25.

Item Type: Article
Funders: Deanship of Scientific Research at Jouf University (Grant No: DSR-2021-02-03107)
Uncontrolled Keywords: Mechanical alloying; Thermoelectric; Skutterudite; Double-filling; InSb nanoinclusions
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 29 Nov 2023 03:53
Last Modified: 29 Nov 2023 03:53

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