Ln 3 Au 3 Sb 4: Thermoelectrics with low thermal conductivity

D. Young, K. Mastronardi, P. Khalifah, C. C. Wang, Robert Joseph Cava, A. P. Ramirez

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12 Scopus citations

Abstract

The thermoelectric properties of intermetallic compounds with the Y 3 Au 3 Sb 4 structure type, of formula Ln 3 Au 3 Sb 4 for Ln = Gd, Nd, Ho, and Sm, are reported. The highest Seebeck coefficients are on the order of 100-200 μV/K, indicating that the dominant carriers are holes, and increase with increasing temperature. Variation of the Au:Sb ratio significantly affects the resistivities and Seebeck coefficients. Materials with mixtures of lanthanides on the large atom site show improved Seebeck coefficients without degradation of the electrical resistivity. The thermal conductivities are very low, even for the stoichiometric materials, and decrease in materials with mixed lanthanides. Band-structure calculations show a complex multivalley character for both valence and conduction bands.

Original languageEnglish (US)
Pages (from-to)3999-4001
Number of pages3
JournalApplied Physics Letters
Volume74
Issue number26
DOIs
StatePublished - Jun 28 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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