Improvement of Bi2Sr2Co2Oy thermoelectric performances by Na doping

Bi 2 Sr 2-x Na x Co 2 O y thermoelectric materials with x = 0, 0.025, 0.05, 0.075, 0.10, 0.125, and 0.15 have been prepared by the classical solid state reaction. Microstructure has shown an important grain growth when Na is added, leading to very high bulk densities confirmed through density measur...

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Bibliographic Details
Published in:Journal of electroceramics 2018-02, Vol.40 (1), p.11-15
Main Authors: Çetin Karakaya, G., Özçelik, Bekir, Nane, O., Sotelo, A., Rasekh, Sh, Torres, M. A., Madre, M. A.
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Crystallography and Scattering Methods
Electrochemistry
Glass
Materials Science
Natural Materials
Optical and Electronic Materials
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Summary:Bi 2 Sr 2-x Na x Co 2 O y thermoelectric materials with x = 0, 0.025, 0.05, 0.075, 0.10, 0.125, and 0.15 have been prepared by the classical solid state reaction. Microstructure has shown an important grain growth when Na is added, leading to very high bulk densities confirmed through density measurements. These modifications have produced a drastic decrease of electrical resistivity without significant modification of Seebeck coefficient. As a consequence, Power Factor has been increased in all Na-doped samples, reaching the maximum value (0.21 mW/K 2 .m at 650 °C) for 0.075 Na samples, which is fairly close to the reported for single crystals.
ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-017-0078-x