Article In: orcid
Thermoelectric Properties of Tetrahedrites Produced from Mixtures of Natural and Synthetic Materials
Materials
— 2025 — MDPI AG
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Published in
March 20, 2025
Abstract
<jats:p>Thermoelectric materials have considerable potential in the mitigation of the global energy crisis, through their ability to convert heat into electricity. This study aims to valorize natural resources, and potentially reduce production costs, by incorporating tetrahedrite–tennantite (td) ores from the Portuguese Iberian Pyrite Belt into synthetic samples. The ore samples were collected in a mine waste at Barrigão and as “dirty-copper” pockets of ore from the Neves Corvo mine. Subsequently, high-energy ball milling and hot pressing were employed in the production of thermoelectric materials. These are characterized by XRD, SEM/EDS, and thermoelectrical properties. The complete dissolution of the dump material sulfides with the synthetic tetrahedrite constituents led to an increase in the amount of the tetrahedrite–tennantite phase, which was made up of a tetrahedrite–tennantite–(Fe) solid solution. The thermoelectric characterization of these materials is provided, revealing that most of the combined synthetic ore samples displayed better results than the pristine tetrahedrite, mostly due to higher Seebeck coefficient values. Furthermore, the best thermoelectric performance is achieved with 10% of ore, where a power factor of 268 µW.K−2.m−1 is reached at room temperature.</jats:p>
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Publication version
VoR - Version of Record
Publisher
MDPI AG
Title of the publication container
Materials
First page or article number
1375
Volume
18
Issue
6
ISSN
1996-1944
Publication language (ISO code)
eng - English
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