Phase separation in the quaternary Heusler compound CoTi(1-x)MnxSb - A 
reduction in the thermal conductivity for thermoelectric applications

Graf, Tanja; Klaer, Peter; Barth, Joachim; Balke, Benjamin; Elmers, Hans-Joachim; Felser, Claudia

doi:10.1016/j.scriptamat.2010.08.039

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Phase separation in the quaternary Heusler compound CoTi_(1-x)Mn_xSb - A reduction in the thermal conductivity for thermoelectric applications

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Graf, T., Klaer, P., Barth, J., Balke, B., Elmers, H.-J., & Felser, C. (2010). Phase separation in the quaternary Heusler compound CoTi_(1-x)Mn_xSb - A reduction in the thermal conductivity for thermoelectric applications. Scripta Materialia, 63(12), 1216-1219. doi:10.1016/j.scriptamat.2010.08.039.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-A4F8-4

Abstract

We investigate the phase separation of the solid solution CoTi(1-x)MnxSb into the two Heusler compounds CoTiSb and CoMnSb. Energy-dispersive X-ray spectroscopy measurements on the two-phase material reveal the presence of size- and shape-tunable CoTiSb regions in a CoMnSb matrix. We demonstrate that the formed phase and grain boundaries have a considerable influence on the phonon scattering processes, which leads to a reduction in the thermal conductivity by a factor of three compared to single-phase CoTiSb. (c) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.