Electrical and thermal transport properties of icosahedral Al 70Pd 22.5 (Re 1-xMn x) 7.5 quasicrystals

Y. K. Kuo, K. M. Sivakumar, C. R. Lin, C. S. Lue, S. T. Lin

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Abstract

This work presents measurements of the electrical resistivity (ρ), Seebeck coefficient, and thermal conductivity (κ) of icosahedral Al70 Pd22.5 (Re1-x Mnx) 7.5 quasicrystals from 10 to 300 K. A series of quasicrystals was prepared with x=0, 0.1, 0.2, 0.3, 0.5, 0.6, 0.8, and 1.0 to systematically study the effect of substitution. The electrical resistivity increases as the temperature decreases, suggesting a semiconductinglike behavior in these alloys. The room-temperature values of the Seebeck coefficient vary from -5 μVK to +65 μVK, showing a significant dependence on the value of x. However, κ exhibits a rather weak composition dependence in the temperature range investigated. The room-temperature dimensionless thermoelectric figure of merit (ZT) of this system is optimized at x=0.1. With further appropriate heat treatments, high ZT is presumably available at elevated temperatures in the Al70 Pd22.5 (Re0.9 Mn0.1) 7.5 sample.

Original languageEnglish
Article number103717
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - 2005 May 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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