Tuning the carrier concentration for thermoelectrical application in the quaternary Heusler compound CO2TiAl(1-x)Six

被引：18

作者：

Graf, Tanja ^{[1
]}

Barth, Joachim ^{[1
]}

Balke, Benjamin ^{[1
]}

Populoh, Sascha ^{[2
,3
,4
]}

Weidenkaff, Anke ^{[2
,3
,4
]}

Felser, Claudia ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Inorgan & Analyt Chem, D-55099 Mainz, Germany

[2] EMPA, Swiss Fed Lab Mat Testing & Res, CH-8600 Dubendorf, Switzerland

[3] EMPA, Swiss Fed Lab Solid State Chem, CH-8600 Dubendorf, Switzerland

[4] EMPA, Swiss Fed Lab Catalysis, CH-8600 Dubendorf, Switzerland

来源：

SCRIPTA MATERIALIA | 2010年 / 63卷 / 09期

关键词：

Thermoelectric materials; Heusler phases; Electronic properties; Thermal conductivity;

D O I：

10.1016/j.scriptamat.2010.07.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The family of half-metallic ferromagnets Co(2)TiZ exhibits exceptional transport properties. The investigated compounds Co2TiAl((1 - x))Si-x (x = 0.25, 0.5, 0.75) show Curie temperatures (T(C)s) that vary between 250 and 350 K, depending on the composition. Above T-C the Seebeck coefficient remains constant. This makes them promising candidates for thermoelectric devices such as thermocouples with a tunable working range. The electrical resistivity data show an anomaly at T-C which is attributed to changes in the electronic structure and therefore in the carrier concentration. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：925 / 928

页数：4

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