In-Filled La0.5Co4Sb12 Skutterudite System with High Thermoelectric Figure of Merit

Bashir, Mohamed Bashir Ali and Said, Suhana Mohd and Sabri, Mohd Faizul Mohd and Miyazaki, Yuzuru and Shnawah, Dhafer Abdulameer and Shimada, Masanori and Salleh, Faiz and Mahmood, Mohamad Syafie and Salih, Ethar Yahya and Fitriani, Fitriani and Elsheikh, Mohamed Hamid (2018) In-Filled La0.5Co4Sb12 Skutterudite System with High Thermoelectric Figure of Merit. Journal of Electronic Materials, 47 (4). pp. 2429-2438. ISSN 0361-5235, DOI

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The contribution of In addition to the La0.5Co4Sb12 skutterudite structure to improve its thermoelectric properties has been demonstrated. InxLa0.5Co4Sb12 (0 ≤ x ≤ 0.3) samples were prepared through mechanical alloying followed by spark plasma sintering. Characterization of the phase structure and morphology of the sintered InxLa0.5Co4Sb12 bulk samples was carried out using x-ray diffraction (XRD) analysis, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. Rietveld analysis of the XRD spectra indicated that double filling at the 2a (000) interstitial site with La and In was successfully achieved, significantly improving the thermoelectric performance of the La0.5Co4Sb12 compound through simultaneous increase in the electrical conductivity and Seebeck coefficient. A maximum power factor of 3.39 × 10−3 W/m-K2 was recorded at 644 K for the In0.3La0.5Co4Sb12 sample, more than 96% of that of the La0.5Co4Sb12 sample. Double filling also effectively reduced the lattice thermal conductivity by about 46%, thus demonstrating that the overall improvement in ZT was primarily due to the reduced thermal conductivity. A maximum ZT value of 1.15 was achieved at 692 K for In0.3La0.5Co4Sb12.

Item Type: Article
Funders: UM Post Graduate Research Grant (PPP) (Grant No. PG136-2015A), University of Malaya Frontier Research Grant (Grant No. FG009-17AFR), Fundamental Research Grant Scheme (Grant No. FP064-2016), Bantuan Kecil Penyelidikan (BKP) (Grant No. BK077-2015)
Uncontrolled Keywords: filled skutterudite; In addition; Thermoelectric material
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Sep 2019 06:56
Last Modified: 13 Sep 2019 06:56

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