Enhanced thermoelectric properties in Bi2Sr2-xBaxCo2Oy via doping and texturing for integration in more efficient thermoelectric generators

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dc.authoridTorres Portero, Miguel Angel/0000-0003-3995-5763
dc.authoridOzkurt, Pinar/0000-0002-9655-0319
dc.contributor.authorOzkurt, Pinar
dc.contributor.authorMadre, M. A.
dc.contributor.authorOzkurt, Berdan
dc.contributor.authorTorres, M. A.
dc.contributor.authorSotelo, A.
dc.date.accessioned2025-03-17T12:25:56Z
dc.date.available2025-03-17T12:25:56Z
dc.date.issued2025
dc.departmentTarsus Üniversitesi
dc.description.abstractBi2Sr2-xBaxCo2Oy (0 <= x <= 0.15) thermoelectric samples have been sintered, and textured through the laser floating zone process using a Nd:YAG laser. Powder XRD studies showed that the thermoelectric phase is the major one in all cases, with higher amount of secondary phases in the textured ones due to their incongruent melting. Microstructural characterization revealed a drastic microstructural modification in the textured samples, when compared to the sintered ones, producing much larger and well oriented grains along the growth direction. These characteristics led to lower electrical resistivity in textured samples, reaching the minimum at 650 degrees C (14.8 mS2 cm) in 0.125Ba-doped samples, which is lower than those typically reported in this system. On the other hand, no significant variation in Seebeck coefficient has been found between the samples. This behaviour is associated to the isovalent doping which does not modify the charge carrier concentration in the material, and the highest values at 650 degrees C (166 mu V/K) are in the order of the reported in the literature. As a consequence, power factor values are mainly driven by the electrical resistivity values, leading to the highest values at 650 degrees C in 0.125Ba-doped textured samples (0.19 mW/K2m) due to their lowest resistivity. These values are higher than the reported for textured materials and in the order of the best reported for this compound in bulk form. All these properties, together with the possibility of the direct integration of these compounds in thermoelectric modules, make them very attractive for practical applications ensuring access to affordable, reliable, and sustainable energy for all.
dc.description.sponsorshipGobierno de Aragon [T54_23R]
dc.description.sponsorshipThis work was supported by the Gobierno de Aragon (T54_23R).
dc.identifier.doi10.1016/j.solidstatesciences.2024.107772
dc.identifier.issn1293-2558
dc.identifier.issn1873-3085
dc.identifier.scopus2-s2.0-85210747897
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.solidstatesciences.2024.107772
dc.identifier.urihttps://hdl.handle.net/20.500.13099/1945
dc.identifier.volume159
dc.identifier.wosWOS:001372495200001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofSolid State Sciences
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250316
dc.subjectBi2Sr2Co2Oy
dc.subjectXRD
dc.subjectElectrical resistivity
dc.subjectSeebeck coefficient
dc.subjectPower factor
dc.subjectSustainable energy
dc.titleEnhanced thermoelectric properties in Bi2Sr2-xBaxCo2Oy via doping and texturing for integration in more efficient thermoelectric generators
dc.typeArticle

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