Simple and efficient synthesis of nanograin structured single phase filled skutterudite for high thermoelectric performance

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Title
Simple and efficient synthesis of nanograin structured single phase filled skutterudite for high thermoelectric performance
Author(s)
Sanghoon Lee; Kyu Hyoung Lee; Young-Min Kim; Hyun Sik Kim; G. Jeffrey Snyder; Seunghyun Baik; Sung Wng Kim
Publication Date
2018-01
Journal
ACTA MATERIALIA, v.142, no., pp.8 - 17
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Filled skutterudites are promising mid-to-high temperature range thermoelectric materials for power generation, however, a traditional melt-solidification process followed by annealing (TMA) and powder metallurgical sintering requires a long processing time more than 10 days to ensure the structural and compositional homogeniety of materials with a high thermoelectric conversion efficiency zT. To address this, we herein report a simple and efficient synthesis of high-performance n- and p-type filled skutterudites that successfully produces a complete single phase from single to multiple filled materials in a day. The nanograin (∼440 nm) structured bulks are prepared from the combined process of temperature-regulated melt spinning (MS) using ingots and short-time spark plasma sintering (SPS). The controlled phase evolution and transformation by adjusting rapid solidification and densification conditions are demonstrated by a comprehensive analysis including structure refinement and atomic-scale observation, verifying the desired occupancy and random distribution of filling elements, respectively. The maximum zT values of filled skutterudites fabricated here were 1.48 ± 0.17 at 800 K for n-type In0.12Yb0.20Co4.00Sb11.84 and 1.15 ± 0.13 at 750 K for p-type Ce0.91Fe3.40Co0.59Sb12.14, which are comparable to the highest zT values reported for filled skutterudites fabricated by TMA-based processes. Superior reproducibility achieved in shortened processing time enables the present synthetic process to be utilized for commercial manufacturing process that can be readily applied to massive production of bulk filled skutterudites for high-performance thermoelectric power generators. © 2017 Acta Materialia Inc
URI
https://pr.ibs.re.kr/handle/8788114/3897
ISSN
1359-6454
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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