TY - JOUR
T1 - Electrical and thermal transport properties of icosahedral Al 70Pd 22.5 (Re 1-xMn x) 7.5 quasicrystals
AU - Kuo, Y. K.
AU - Sivakumar, K. M.
AU - Lin, C. R.
AU - Lue, C. S.
AU - Lin, S. T.
N1 - Funding Information:
The authors would like to thank the National Science Council of the Republic of China for financially supporting this research under Contracts No. NSC-93-2112-M-259-004 (YKK), No. NSC-93-2112-M-006-001 (CSL), and No. NSC-93-2112-M-006-013 (STL).
PY - 2005/5/15
Y1 - 2005/5/15
N2 - 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.
AB - 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.
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U2 - 10.1063/1.1905795
DO - 10.1063/1.1905795
M3 - Article
AN - SCOPUS:20944446991
VL - 97
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 10
M1 - 103717
ER -