The Effect of Nano-SiO₂ Addition on Electrical Properties of the Thermoelectric Compound Ca₃Co₄O₉

Abstract:

Abstract. Ca3CO4O9/x wt.%SiO2 composites were prepared by using field-activated pressure-assisted synthesis(FAPAS) process. The effects of nano-SiO2 addition on the microstructure and thermoelectric properties of the Ca3CO4O9 were investigated. With an increasing of the of SiO2 content, the size of Ca3Co4O9 particles decreased. The Seebeck coefficient decreased after the doping of nano-SiO2. The electrical conductivity firstly increased and then decreased with increasing amount of nano-SiO2 and the highest value belong to the Ca3CO4O9/0.5 wt.% SiO2 - sample. With the highest electric conductivity and slightly decreased Seebeck coefficient, the Ca3CO4O9/0.5 wt.%SiO2-sample achieved the highest power factor of 0.349 mw/mk2 at 800 °C, which is 8% higher than the value of pure Ca3CO4O9 reported in the literature.

• Periodical: Advanced Materials Research (Volume 465)
• Pages: 292-295
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.465.292
• Online since: February 2012
• Authors: Wei Wei Sun, Wen Hao Fan, Shao Ping Chen, Yi Yun Li, Qing Sen Meng
• Keywords: Carrier Concentration, Nano-SiO₂, Point Defect, Power Factor

References

[1] L.D. Zhao, B.P. Zhang, J.F. Li, Enhanced thermoelectric and mechanical properties in textured n-type Bi2Te3 prepared by spark plasma sintering, Solid State Sci. 10 (2008) 651-658.

DOI: 10.1016/j.solidstatesciences.2007.10.022

[2] M. Prevel, O. Perez, J.G. Noudem, Bulk textured Ca2. 5(RE)0. 5Co4O9 (RE: Pr, Nd, Eu, Dy and Yb) thermoelectric oxides by sinter-forging, Solid State Sci. 9 (2007) 231-235.

DOI: 10.1016/j.solidstatesciences.2007.01.003

[3] Y.F. Zhang, J.X. Zhang, Rapid reactive synthesis and sintering of textured Ca3Co4O9 Ceramics by spark plasma sintering, J. Mater. Process. Tech. 208(2008) 70-74.

DOI: 10.1016/j.jmatprotec.2007.12.093

[4] F. Delorme, C. Fernandez Martin, P. Marudhachalam, Effect of Ca substitution by Sr on the thermoelectric properties of Ca3Co4O9 ceramics, J. Alloy. Compd. 509 (2011) 2311-2315.

DOI: 10.1016/j.jallcom.2010.10.209

[5] J. Nan, J. Wu , Y. Deng, Synthesis and thermoelectric properties of (NaxCa1-x)3Co4O9 ceramics, J. Eur. Ceram. Soc. 23 (2003) 859-863.

DOI: 10.1016/s0955-2219(02)00202-9

[6] S. Pinitsoontorn, N. Lerssongkram, A. Harnwunggmoung, Synthesis, mechanical and magnetic properties of transition metals-doped Ca3Co3. 8M0. 2O9, J. Alloy. Compd. 503 (2010) 431-435.

DOI: 10.1016/j.jallcom.2010.05.027

[7] L. Li, S.Z. Jin, J.F. Li, The synthesis of SiC/CoSb3 thermoelectric material and the thermoelectric transport properties, Rare Mat. Eng. 36 (2007) 398-400.

[8] L.D. Zhao, B.P. Zhang, J.F. Li, Preparation and properties of nano-SiC/Bi2Te3 thermoelectric material, Rare Mat. Eng. 36 (2007) 408-411.

[9] Z. He, C. Stiewe, D. Platzek, NanoZrO2/CoSb3 composites with improved thermoelectric figure of merit, J. Nanotechnol. 18 (2007) 1-6.

[10] Z. Xiong, X.H. Chen, X.Y. Zhao, Effects of nano-TiO2 dispersion on the thermoelectric properties of filled-skutterudite Ba0. 22Co4Sb12, J. Solid State Sci. 11 (2009) 1612-1616.

DOI: 10.1016/j.solidstatesciences.2009.06.007