Effect of Ge doping on thermoelectric properties of SryCo 4Sb12-xGex

Xueying Zhao, Xiaoya Li, Lidong Chen, Yanzhong Pei, Shengqiang Bai, Xun Shi, Takashi Goto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Skutterudite compounds, SryCo4Sb 12-xGex (y = 0.3, x = 0-0.3), are synthesized by a melting method. The effect of germanium doping on thermoelectric properties is investigated. Electrical conductivity, Seebeck coefficient, and thermal conductivity are measured from 300 to 850 K. The substitution of germanium is effective in reducing thermal conductivity while keeping excellent electrical transport properties owing to the high filling fraction of Sr and Ge doping as charge compensation. The dimensionless thermoelectric figure of merit ZT is observed to increase from 0.9 at 850 K for Sr0.28Co 4Sb12 to 1.05 for Sr0.34Co4Sb 11.9Ge0.1 at 850 K. These results suggest that doping with germanium is an attractive avenue to optimization of filled skutterudites.

Original languageEnglish
Pages (from-to)7470-7473
Number of pages4
JournalJapanese journal of applied physics
Volume47
Issue number9 PART 1
DOIs
Publication statusPublished - 2008 Sep 12

Keywords

  • Filled skutterudites
  • Ge-doping
  • Sr
  • Thermoelectric properties

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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