Anomalous barium filling fraction and n-type thermoelectric performance of BayCo4Sb12

L. D. Chen, T. Kawahara, X. F. Tang, T. Goto, T. Hirai, J. S. Dyck, W. Chen, C. Uher

Research output: Contribution to journalArticlepeer-review

410 Citations (Scopus)

Abstract

Barium-filled skutterudites BayCo4Sb12 with an anomalously large filling fraction of up to y=0.44 have been synthesized. The lattice parameters increase linearly with Ba content. Magnetic susceptibility data show that Ba0.44Co4Sb12 is paramagnetic, which implies that some of the Co atoms in BayCo4Sb12 have acquired a magnetic moment. The presence of the two different valence states of Co (Co3+ and Co2+) leads to the anomalously large barium filling fraction even without extra charge compensation. All samples show n-type conduction. The electrical conductivity increases with increasing the Ba filling fraction. The lattice thermal conductivity of BayCo4Sb12 is significantly depressed as compared to unfilled Co4Sb12. The dimensionless thermoelectric figure of merit, ZT, increases with increasing temperature reaching a maximum value of 1.1 for Ba0.24Co4Sb12 at 850 K.

Original languageEnglish
Pages (from-to)1864-1868
Number of pages5
JournalJournal of Applied Physics
Volume90
Issue number4
DOIs
Publication statusPublished - 2001 Aug 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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