Correlation between valence electron concentration and thermoelectric properties of Fe11Ti3Al6

Singh, Sukhwinder, Ugwuanyi, Godwin ORCID: https://orcid.org/0000-0003-2871-0509, Yusuf, Gbadebo Taofeek, Rocha, Victoria G. and Min, Gao 2025. Correlation between valence electron concentration and thermoelectric properties of Fe11Ti3Al6. Journal of Alloys and Compounds Communications 8 , 100132. 10.1016/j.jacomc.2025.100132

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Abstract

This study investigates how changes in valence electron concentration (VEC), achieved through Period 4 elemental substitution, influence the Seebeck coefficient and carrier type of Fe11Ti3Al6 alloy. Samples were fabricated by mechanical alloying, cold pressing, and annealing. XRD analysis confirmed that all substituted samples attained a phase structure similar to the Fe3Al intermetallic alloy. Thermoelectric measurements revealed that Seebeck coefficient and electrical resistivity of Fe11Ti3Al6 alloy are strongly affected by VEC. A reduction in VEC below 5.9 increases the Seebeck coefficient, improving thermoelectric performance. However, when VEC exceeds 6, Fe11Ti3Al6 alloy transitions from p-type to n-type conduction. This tuneable conduction behaviour by VEC manipulation exhibits semiconductor-like characteristics. Such a unique feature enhances the potential of Fe11Ti3Al6 alloy as a versatile thermoelectric material, offering a convenient route for preparing p-type and n-type materials, both of which are required for fabrication of thermoelectric modules.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
ISSN:	2950-2845
Date of First Compliant Deposit:	20 October 2025
Date of Acceptance:	9 October 2025
Last Modified:	21 Oct 2025 14:28
URI:	https://orca.cardiff.ac.uk/id/eprint/181764

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