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dc.contributor.authorÖzçelik, Can
dc.contributor.authorDepci, Tolga
dc.contributor.authorÇetin, Gizem
dc.contributor.authorGürsul, Mehmet
dc.contributor.authorÖzçelik, Bekir
dc.contributor.authorMadre, María Antonieta
dc.contributor.authorSotelo, Andrés
dc.contributor.authorAndo, Hiroshi
dc.contributor.authorTerashima, Kensei
dc.contributor.authorTakano, Yoshihiko
dc.date.accessioned2022-11-21T10:46:16Z
dc.date.available2022-11-21T10:46:16Z
dc.date.issued2022en_US
dc.identifier.citationÖzçelik, C., Depci, T., Çetin, G., Gürsul, M., Özçelik, B., Madre, M.A., Sotelo, A., Ando, H., Terashima, K., Takano, Y. (2022). Detailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibers. Physica Scripta, 97 (8), art. no. 085820.en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12508/2293
dc.description.abstractThe effect of K substitution for Ca in Bi2Ca2-xKxCo2Oy (x = 0.0, 0.05, 0.075, 0.10, and 0.125) thermoelectric ceramics, produced via laser floating zone (LFZ) method, have been systematically investigated. XRD patterns are quite similar for all samples and main peaks in the patterns correspond to reflection planes of the thermoelectric phase together with small amount of secondary phases. SEM micrographs revealed well oriented grains along the growth direction, and the presence of three different contrasts, associated through EDS to different phases, namely, black (Co oxide), white (Bi poor phase) and grey (Bi2Ca2Co1.7Oy TE phase). It was also seen that the amount of secondary phases diminishes with K-increase. The room-temperature resistivity values sharply decrease from 0.75 mΩ.m for the undoped sample to 0.44 mΩ.m for the 0.05 K-doped one, increasing for higher doping. Seebeck coefficient also decreases from 190 μV K−1 in the pristine sample, to 160 μV K−1 in all the K-doped ones, at 390 K. Thermal conductivity increases with temperature up to around 250 K, decreasing at higher temperatures. Thermal conductivity at 390 K decreases from 1.1 W K−1 m−1 in the pristine sample to lower values by K-doping, reaching the minimum, 0.9 W K−1 m−1, in the 0.125 K-doped one. As a result, the highest ZT value of has been determined in 0.05 K-doped sample, around 0.021 at 390 K.en_US
dc.language.isoengen_US
dc.publisherInstitute of Physicsen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectElectrical propertiesen_US
dc.subjectFigure of meriten_US
dc.subjectMicrostructureen_US
dc.subjectTextureen_US
dc.subjectThermoelectric oxidesen_US
dc.subject.classificationCobaltite
dc.subject.classificationOxide
dc.subject.classificationNacoo2
dc.subject.classificationPhysics
dc.subject.classificationPhysics - Thermoelectric Materials - Thermoelectric Properties
dc.subject.otherMagnetic-properties
dc.subject.otherThermopower
dc.subject.otherFabrication
dc.subject.otherImprovement
dc.subject.otherCobaltites
dc.subject.otherSalt
dc.subject.otherBismuth compounds
dc.subject.otherCalcium compounds
dc.subject.otherCobalt compounds
dc.subject.otherPotassium compounds
dc.subject.otherTemperature
dc.subject.otherThermal conductivity
dc.subject.otherThermoelectricity
dc.subject.otherFigure of merit
dc.subject.otherK-doped
dc.subject.otherLaser floating zone methods
dc.subject.otherLows-temperatures
dc.subject.otherSecondary phase
dc.subject.otherTemperature study
dc.subject.otherThermoelectric
dc.subject.otherThermoelectric oxides
dc.subject.otherThermoelectric performance
dc.subject.otherXRD patterns
dc.subject.otherTextures
dc.titleDetailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibersen_US
dc.typearticleen_US
dc.relation.journalPhysica Scriptaen_US
dc.contributor.departmentMühendislik ve Doğa Bilimleri Fakültesi -- Petrol ve Doğalgaz Mühendisliği Bölümüen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.contributor.isteauthorÖzçelik, Can
dc.contributor.isteauthorDepci, Tolga
dc.relation.indexWeb of Science - Scopusen_US
dc.relation.indexWeb of Science Core Collection - Science Citation Index Expanded


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