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Effects of K substitution on thermoelectric and magnetic properties of Bi2Sr2Co2Oy ceramic

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Abstract

In this work, Bi2Sr2−xKxCo2Ox thermoelectric materials with x = 0.0, 0.025, 0.050, 0.075, 0.10, 0.125, and 0.15 have been produced through the classical solid-state reaction. SEM characterization has shown an improvement of microstructure and a porosity decrease with K substitution, leading to very high densities, confirmed by apparent density measurements. These modifications have been reflected in a drastic decrease of electrical resistivity with slight modification of Seebeck coefficient. As a consequence, power factor has been increased in all the K doped samples, reaching the maximum values (0.192 mW/K2 m at 650 °C) in 0.075 K containing samples, which is fairly close to the reported values in single crystals. Magnetic results have shown that all samples are paramagnetic above 50 K and below they undergo to an antiferromagnetic phase transition. From temperature dependence of magnetic hysteresis, it has been observed that the slope of curves and the magnitude of magnetization have been increased when the temperature is decreased.

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Acknowledgements

This work is supported by Research Fund of Çukurova University, Adana, Turkey, under Grant contracts no: FBA-2016-7204 and FDK-2016-6105. The Spanish authors thank the Gobierno de Aragón-FEDER (Grupos de Investigacion Consolidados T12 and T87) and MINECO-FEDER (MAT2013-46505-C3-1-R) for financial support. Spanish Authors acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.

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Correspondence to Bekir Özçelik.

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Çetin Karakaya, G., Özçelik, B., Torres, M.A. et al. Effects of K substitution on thermoelectric and magnetic properties of Bi2Sr2Co2Oy ceramic. J Mater Sci: Mater Electron 28, 12652–12659 (2017). https://doi.org/10.1007/s10854-017-7090-4

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