Thermoelectric properties of Heusler-type (Fe1-xCox)2TiAl alloys

被引：5

作者：

Iwase, Keigo ^{[1
]}

Nishino, Yoichi ^{[1
]}

Miyazaki, Hidetoshi ^{[2
]}

Soda, Kazuo ^{[2
]}

机构：

[1] Nagoya Inst Technol, Dept Mat Sci & Engn, Grad Sch Engn, Nagoya, Aichi 4668555, Japan

[2] Nagoya Univ, Grad Sch Engn, Dept Quantum Engn, Nagoya, Aichi 4648603, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2008年 / 72卷 / 06期

关键词：

Heusler alloys; thermoelectric properties; FeCoTiAl; pseudogap;

D O I：

10.2320/jinstmet.72.464

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

We report on the temperature dependence of the electrical resistivity and the Seebeck coefficient for the Heusler-type (Fe1-xCox)(2)TiAl alloys with compositions 0.25 <= x <= 0.70. A small deviation from stoichiometry (x=0.50) causes a decrease in the electrical resistivity and an enhancement in the Seebeck coefficient with positive and negative sign for x<0.45 and x >= 0.45, respectively. This compositional variation of the Seebeck coefficient is in line with a pseudogap scenario where the off-stoichiometry causes a rigid-band-like shift of the Fermi level from the central region in the pseudogap. The measured Seebeck coefficient is found to be lower than that evaluated from the theoretical density of states, which may be attributed to an atomic disorder between Fe and Co.

引用

页码：464 / 469

页数：6

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