High temperature electrical transport in Al-Pd-Mn quasicrystals

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI:10.1109/ICT.1999.843419

A. Pope, R. Littleton, J. Jeffries, T. Tritt, M. Feuerbacher, R. Gagnon, S. Legault, J. Strom-Olsen

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Abstract

We report measurements of the electrical conductivity /spl sigma/(T) and the Seebeck coefficient /spl alpha/(T) of a Czochralski-grown single phase quasicrystal of icosahedral Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/ in the temperature range between 5 and 600 K. The electrical conductivity /spl sigma/(T) is only weakly temperature dependent. The values of the conductivity fall in the range between 630 and 740 (/spl Omega/ cm)/sup -1/. The Seebeck coefficient, /spl alpha/(T), increases monotonically with increasing temperature, reaches a maximum of 110 /spl mu/V/K at around 500 K after which the thermopower begins to decrease with increasing temperature. The power factor, /spl alpha//sup 2//spl sigma/T, is obtained from the electrical conductivity and thermopower data and at T=600 K, the power factor of icosahedral Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/ reaches 0.5 W/m-K. This indicates that quasiperiodically structured alloys may be promising materials for thermoelectric applications at temperatures above room temperature.

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Al-Pd-Mn准晶体中的高温电输运

本文报道了在5 ~ 600 K的温度范围内测量了二十面体Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/单相准晶的电导率/spl sigma/(T)和塞贝克系数/spl alpha/(T)。电导率/spl σ /(T)对温度的依赖性较弱。电导率值在630 ~ 740 (/spl ω / cm)/sup -1/之间。塞贝克系数/spl α /(T)随温度的升高而单调增加，在500 K左右达到最大值110 /spl μ /V/K，之后热功率开始随温度的升高而降低。由电导率和热功率数据得到功率因数/spl alpha//sup 2//spl sigma/T，在T=600 K时，二十面体Al/sub 70.8/Pd/sub 20.9/Mn/sub 8.3/的功率因数达到0.5 W/m-K。这表明准周期性结构合金可能是在室温以上温度下热电应用的有前途的材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)

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