Microwave-Assisted Solution Combustion Synthesis and Characterization of Thermoelectric Ca3Co2O6 Powders


Article Preview

The microwave-assisted solution combustion synthesis was applied to the initial synthesizing of Ca3Co2O6 powder using glycine as a fuel and nitrate as an oxidant. The as-synthesized powders were calcined at 700-1,000ºC for 4h. Product characterization was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Scanning electron microscope (SEM). The fuel-to-oxidizer molar ratio was found to affect the combustion reaction and character of the powder obtained. The phase composition of powder after calcination at various temperatures has shown that the formation of Ca3Co2O6 occurs directly. The calcined powder possesses a rhombohedral crystal structure with an X-ray diffraction pattern that could be matched with the Ca3Co2O6JCPDS: 89-0629. This method is a simple way of synthesizing fine Ca3Co2O6 powder with a low calcination temperature.



Edited by:

Jiti Nukeaw and Wisanu Pecharapa




S. Kahatta et al., "Microwave-Assisted Solution Combustion Synthesis and Characterization of Thermoelectric Ca3Co2O6 Powders", Advanced Materials Research, Vol. 802, pp. 84-88, 2013

Online since:

September 2013




[1] M. Hervieu, P. H. Boullay, C. Michel, A. Maignan and B. Raveau, A New Family of Misfit Layered Oxides with Double Rock Salt Layers Bix (A0. 75±εBi0. 25±ε O)(3+3x)/2MO2(A=Ca, Sr and M=Co, Cr),J. Solid State Chem. 142(1999)305–318.

DOI: https://doi.org/10.1006/jssc.1998.8039

[2] M. W. Heller, R. D. Nasby and R. T. I. Johnson Jr, Electrical transpoet properties of SiGe thermoelectric alloys doped with As, P, and As+P, J. Appl Phys. (47) (1976).

[3] I. Terasaki, Y. Sasago and K. Uchinokura, Large thermoelectric power in NaCo2O4 single crystals, Phys. Re. 56(1997)12685-12687.

[4] M. Mikami, R. Funahashi, M. Yoshimura, et. al, J. Appl, High-temperature thermoelectric properties of single-crystal Ca3Co2O6, J. Appl. 94(2003)6579-6582.

DOI: https://doi.org/10.1063/1.1622115

[5] E. Woermann and A. Muan, Phase eguilibria in the system CaO-cobalt oxide in air, J. Inorg. Nucl, Chem. 32(1970)1457.

[6] K. Iwasaki, H. Yamane, S. Kubota, J. Takahashi and M. Shimada, Power factors of Ca3Co2O6 and Ca3Co2O6-based solid solutions, J. Alloys Compd. 358(2003)210–215.

DOI: https://doi.org/10.1016/s0925-8388(03)00041-0

[7] J. Takahashi, M. Shimada and H. Yamane, Thermoelectric properties of Fe-doped Ca3Co2O6 single crystals with a pseudo-one-dimensional structure, Phys. stat. sol. 203(2006)2836–2840.

DOI: https://doi.org/10.1002/pssa.200669578

[8] M. Senthilkumar and R. Vijayaraghavan, High-Temperature resistivity and thermoelectric properties of coupled substituted Ca3Co2O6, Sci. Technol. Adv. Mater. 10(2009).

[9] L. Dongqing, C. Gang, P. Jian, Y. Xi and X. Hengze, Effect of erbium substitution on thermoelectric properties of complex oxide Ca3Co2O6 at high temperatures, J. rare earths. (2008)168-172.

DOI: https://doi.org/10.1016/s1002-0721(08)60059-9