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Thermoelectric and structural properties of high-performance In-based skutterudites for high-temperature energy recovery
, M.S. Good, K.C. Roberts, M.A. Subramanian, T.J. Hendricks
Published in
Volume: 26
Issue: 15
Pages: 1827 - 1835
The temperature-dependent thermoelectric (TE) and structural properties of n-type filled skutterudites were measured from 300-625 K. In 0.2Co4Sb12, and In0.2Ce 0.05Yb0.1Co4Sb12 exhibited figure of merit (ZT) values as high as 1.2 at 625 K and In0.2Ce 0.15Co4Sb12 showed ZT values of ∼1.4 at 625 K. The room temperature Young's modulus, Poisson's ratio, and coefficient of thermal expansion (at 298-673 K) of In0.2Ce0.15Co 4Sb12, In0.2Co4Sb12, and In0.2Ce0.05Yb0.1Co4Sb12 compositions were found to be lower than that for the unfilled Co 4Sb12 skutterudite material. It was discovered that thermal cycling of n-type In0.15Ce0.1Co4Sb 12 and In0.2Ce0.17Co4Sb12 materials from 323-673 K (200 cycles) actually increased their power factors by 13.6-36% at 510-525 K without appreciably changing the Young's modulus or the Poisson's ratio. The transport and structural properties characterized in this work are critical to transitioning these materials into operating TE devices and systems. Copyright © Materials Research Society 2011.
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JournalJournal of Materials Research