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Novel fast synthesis route for α-MgAgSb thermoelectric materials

2026-02Artigo científico Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia dos Materiais
datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologias
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorSantos, Beatriz
dc.contributor.authorSá, Ana
dc.contributor.authorLuz, Paulo P. da
dc.contributor.authorNeves, Filipe
dc.contributor.authorde Boor, Johannes
dc.contributor.authorPereira Gonçalves, Antonio
dc.date.accessioned2026-03-13T14:32:15Z
dc.date.available2026-03-13T14:32:15Z
dc.date.issued2026-02
dc.description.abstractABSTRACT: Thermoelectric (TE) materials capable of waste heat recovery in the temperature range of 300-525 K remain relatively underdeveloped compared to conventional Bi2Te3-based systems, which present inherent environmental, health, and cost challenges. Recently, MgAgSb-based compounds have garnered significant research interest for applications in this temperature range owing to their intrinsically low thermal conductivity, high figure of merit and higher abundance. However, synthesis of the desired low-temperature alpha-MgAgSb phase typically requires highly controlled production processes-such as multi-step mechanical alloying, followed by extensive, week-long annealing-to mitigate the formation of or transition to undesirable phases. This study proposes an original, rapid, and scalable synthesis strategy combining induction melting for only six minutes with the subsequent classic hot-pressing method. We investigated the effect of nominal stoichiometry on thermoelectric performance by synthesising three distinct compositions: MgAg0.97Sb0.995, MgAg0.965Sb0.985, and MgAg0.955Sb0.985. The MgAg0.955Sb0.985 composition exhibited optimal performance, achieving an average power factor (PF) of 12.8 mu W K-2 cm-1 in the 300-525 K range. By considerably reducing the thermal budget and processing time, this approach significantly improves the energy payback time (EPBT) and reduces the carbon footprint of production, addressing the critical sustainability-performance trade-off that limits large-scale deployment. This result validates the capacity of the proposed fast synthesis route to yield performant MgAgSb-based samples and suggests that the optimal nominal composition is dependent on the specific production technique employed. Fundamentally, this work demonstrates the rapid and successful preparation of the desired alpha-MgAgSb phase using an easily scalable technique that does not require a perpetually inert atmosphere. This process utilises bulky precursor elements directly, significantly reducing production complexity, associated costs, and health hazards. This advancement provides a simpler and more industrially viable pathway for the transition of MgAgSb materials toward commercial availability.eng
dc.identifier.citationSantos, B., Sá, A.I., Luz, P., Neves, F., Boor, J., & Gonçalves, A.P. (2026). Novel fast synthesis route for α-MgAgSb thermoelectric materials. In: RSC Applied Interfaces, Feb. 2026. http://dx.doi.org/10.1039/d5lf00400d
dc.identifier.doi10.1039/d5lf00400d
dc.identifier.eissn2755-3701
dc.identifier.urihttp://hdl.handle.net/10400.9/6306
dc.language.isoeng
dc.peerreviewedyes
dc.publisherRoyal Society of Chemistry
dc.relationThermoeletric Technologies for Small Satellites
dc.relationCentre for Nuclear Sciences and Technologies
dc.relation.hasversionhttps://pubs.rsc.org/en/content/articlelanding/2026/lf/d5lf00400d
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMaterials
dc.subjectThermoelectric materials
dc.subjectThermal conductivity
dc.subjectPerformance
dc.titleNovel fast synthesis route for α-MgAgSb thermoelectric materialseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberPRT/BD/153039/2021
oaire.awardNumberUID/Multi/04349/2019
oaire.awardTitleThermoeletric Technologies for Small Satellites
oaire.awardTitleCentre for Nuclear Sciences and Technologies
oaire.awardURIhttp://hdl.handle.net/10400.9/6305
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04349%2F2019/PT
oaire.citation.titleRSC Applied Interfaces
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameSá
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person.familyNamede Boor
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person.givenNameAna
person.givenNameFilipe
person.givenNameJohannes
person.givenNameAntonio
person.identifier.ciencia-idB615-CCF2-424E
person.identifier.ciencia-id1815-040B-3FEF
person.identifier.ciencia-id4D1A-2834-70FA
person.identifier.orcid0000-0003-1267-7994
person.identifier.orcid0000-0002-1251-053X
person.identifier.orcid0000-0002-1868-3167
person.identifier.orcid0000-0003-2640-3038
person.identifier.ridA-7836-2012
person.identifier.ridB-2849-2008
person.identifier.scopus-author-id7004435348
person.identifier.scopus-author-id7102086109
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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