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Tuning the carrier concentration for thermoelectrical application in the quaternary Heusler compound CO2TiAl1-xSix

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Citation

Graf, T., Barth, J., Balke, B., Populoh, S., Weidenkaff, A., & Felser, C. (2010). Tuning the carrier concentration for thermoelectrical application in the quaternary Heusler compound CO2TiAl1-xSix. Scripta Materialia, 63(9), 925-928. doi:10.1016/j.scriptamat.2010.07.001.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-A4DF-D
Abstract
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.