Thermoelectric Properties of Sn²⁺-Substituted CuFeO₂ Delafossite-Oxide

Abstract:

This study aims to investigate the effect of the Sn²⁺-substituted into the CuFeO₂ delafossite on thermoelectric properties in the Sn content of x = 0.03, 0.05. The CuFe_1−xSn_xO₂ samples were synthesized by solid state reaction. The crystal structure was characterized by XRD, TGA, XPS and the thermoelectric properties were measured in the range of 300 to 960 K. The Seebeck coefficient display positive sign in all temperature range and the XPS show the stable Sn⁺² state as confirming the Sn-doped CuFeO₂ playing p-type conductor. The Sn²⁺-substituted supports the mixed valency Fe³⁺/Fe⁴⁺ state in transition octahedral oxide of FeO₆ layer enhancing Seebeck coefficient. The high Seebeck are appeared in content of x=0.03 which are 280 to 340 µV/K in the range of 300 to 800 K. The experimental Seebeck corresponds to the prediction formula at high temperature. Totally, the maximum Power Factor is 2.30×10⁻⁴ W/mK² occurring in the CuFe_0.95Sn_0.05O₂ at 860 K which is higher than that value of the undoped-CuFeO₂ in 4 times. These support that the Sn-substituted CuFeO₂ delafossite enhancing thermoelectric properties.

• Periodical: Advanced Materials Research (Volume 802)
• Pages: 17-21
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.802.17
• Online since: September 2013
• Authors: Chesta Ruttanapun, Phumin Jindajitawat, Warawoot Thowladda, Worakarn Neeyakorn, Chanchana Thanachayanont, Anek Charoenphakdee
• Keywords: CuFe1-xSnxO2, Mixed Fe3+/Fe4+Valence, Sn2+Substituted, Thermoelectric Properties

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