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Journal of Materials Science: Materials in Electronics
Erschienen in: Journal of Materials Science: Materials in Electronics 18/2020

19.08.2020

Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique

verfasst von: G. Çetin, B. Özçelik, M. Gürsul, M. A. Madre, A. Sotelo, S. Adachi, Y. Takano

Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 18/2020

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Abstract

In this study, Bi2Sr2−xNaxCo2Oy (x = 0.0, 0.05, 0.075, 0.10, and 0.15) ceramic powders have been fabricated via the classical ceramic route, followed by a texturing process through the laser floating zone technique. XRD patterns show the thermoelectric phase as the major one. In addition, Na-substitution reduces the amount of secondary phases, when compared to the pure sample. SEM observations point out that grain orientation is significantly improved when Na-content is increased. Na-substitution reduces electrical resistivity from 35 (in pure samples) to 19.6 mΩ cm (in Na = 0.05 ones) at around room temperature, while Seebeck coefficient is, approximately, twice measured in Na-free. On the other hand, thermal conductivity is slightly lower in undoped samples (0.83 W/K m), when compared to the Na-substituted ones (1.10–1.40 W/K m) at room temperature, due to their lower electrical conductivity. Finally, ZT values are higher when the Na-content is increased, reaching 0.022 at around 400 K.
Vorheriger Artikel Effective and magnetically recoverable TiO2/Fe3O4/AgI nanocomposite for degradation dye pollutants under visible light illumination
Nächster Artikel Electrochemically growth and characterization of CuInTe2 chalcopyrite thin films

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Metadaten
Titel
Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique
verfasst von
G. Çetin
B. Özçelik
M. Gürsul
M. A. Madre
A. Sotelo
S. Adachi
Y. Takano
Publikationsdatum
19.08.2020
Verlag
Springer US
Erschienen in
Journal of Materials Science: Materials in Electronics / Ausgabe 18/2020
Print ISSN: 0957-4522
Elektronische ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-020-04119-7

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