Improving the Seebeck coefficient and electrical conductivity of Fe11Ti3Al6 by substituting Fe with Cr

Singh, Sukhwinder ORCID: https://orcid.org/0000-0002-4788-8292, Alemzadeh, Joseph, Menendez Rodriguez, Guillermo, Phillips, Matthew, Zabek, Daniel ORCID: https://orcid.org/0000-0001-5856-5301, Burton, Matthew, Rocha, Victoria G. and Min, Gao ORCID: https://orcid.org/0000-0001-9591-5825 2025. Improving the Seebeck coefficient and electrical conductivity of Fe11Ti3Al6 by substituting Fe with Cr. Journal of Electronic Materials 10.1007/s11664-024-11723-4

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Abstract

In general, any attempt to increase the Seebeck coefficient is usually accompanied by a decrease in the electrical conductivity or vice versa due to the interplay between these two parameters. This work demonstrates that a simultaneous increase in both the Seebeck coefficient and electrical conductivity can be obtained by “doping” in intermetallic alloys. A new alloy composition, Fe10Cr1Ti3Al6, was synthesized by substituting Fe with Cr in Fe11Ti3Al6 using mechanical alloying and spark plasma sintering (SPS). The thermoelectric measurements revealed that the Cr substitution led to an increase in the Seebeck coefficient from +27 µV/K in Fe11Ti3Al6 to +39 µV/K in Fe10Cr1Ti3Al6, with a corresponding increase in the electrical conductivity from 2.5 × 105 S/m to 4.7 × 105 S/m, resulting in a significant increase in the power factor. The temperature dependence of the thermoelectric properties of this new alloy was also investigated over a temperature range of 50–727°C. The result showed that a maximum power factor of 6.0 × 10−4 W/m K2 was obtained at 53°C.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Engineering
Publisher:	Springer
ISSN:	0361-5235
Funders:	Ministry of Social Justice & Empowerment, Royal Academy of Engineering, ACCMET, EPSRC
Date of First Compliant Deposit:	13 January 2025
Date of Acceptance:	27 December 2024
Last Modified:	14 Jan 2025 10:03
URI:	https://orca.cardiff.ac.uk/id/eprint/175218

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