Influence of Na Doping on the Thermoelectric Properties of CuAlO2 Delafossite

Ngamnit Wongcharoen; Thitinai Gaewdang

doi:10.4028/www.scientific.net/AMR.931-932.127

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 931-932Influence of Na Doping on the Thermoelectric...

Influence of Na Doping on the Thermoelectric Properties of CuAlO₂ Delafossite

Abstract:

The polycrystalline Na-doped CuAlO₂ ceramics were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al₂O₃ and NaNO₃6H₂O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1,423 K for 24 h. XRD patterns showed the crystal structure of the as-sintered Cu_1-xNa_xAlO₂ (0x0.05) belonging to rhombohedral, space groupalong with the CuO and CuAl₂O₄ phases. The minimum resistivity value around 4.48x10² Ωcm and maximum hole concentration around 2.04x10¹⁶ cm^-3 were observed for x=0.03 at room temperature. The properties of Seebeck coefficient and electrical resistivity were measured in the high temperature ranging 300 to 700 K. The results of electrical resistivity, Seebeck coefficient and power factor values decrease with increasing Na content. The calculated activation energy of conductivity (in the range of 160-250 meV) is larger than that of thermopower (in the range of 26-83 meV) which suggests that the conduction mechanism may be determined as a small polaron hopping type.

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Advanced Materials Research (Volumes 931-932)

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127-131

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https://doi.org/10.4028/www.scientific.net/AMR.931-932.127

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Online since:

May 2014

Authors:

Ngamnit Wongcharoen*, Thitinai Gaewdang

Keywords:

Na-Doped CuAlO₂, Power Factor, Seebeck Coefficient, Thermoelectric Properties

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References

[1] S.I. Yanagiya, N.V. Nong, J. Xu and N. Pryds, The effect of (Ag, Ni, Zn)-addition on the thermoelectric properties of copper aluminate, Materials 3 (2010) 318-328.

DOI: 10.3390/ma3010318

Google Scholar

[2] S.Y. Sohn and Y.S. Han, Transparent conductive oxide (TCO) films for organic light emissive devices (OLEDS), in: S.H. Ho (Ed. ), Organic light emitting diode material, processing and devices, Intech, Croatia, 2011, pp.233-274.

DOI: 10.5772/18545

Google Scholar

[3] Ng. Wongcharoen, T. Gaewdang and T. Wongcharoen, Structural and thermoelectric properties of Zn-doped cuprous aluminate delafossite, Advanced Materials Research 747 (2013) 333-336.

DOI: 10.4028/www.scientific.net/amr.747.333

Google Scholar

[4] C. Ruttanapun, A. Wichainchai, W. Prachamon, A. Yangthaisong, A. Charoenpakdee and T. Seetawan, Thermoelectric properties of Cu1-xPtxFeO2(0≤x≤0. 05) delafossite-type transition oxide, J. Alloys Comp., 509 (2011) 4588-4594.

DOI: 10.1016/j.jallcom.2011.01.113

Google Scholar

[5] J. A. Kaduk and S. Pei, The crystal structure of hydrated sodium aluminate, NaAlO2 5/4H2O and its dehydration product, J. Solid State Chem. 115 (1995) 126-139.

DOI: 10.1006/jssc.1995.1111

Google Scholar

[6] X. Zhang, H. Hao, Q. He and X. Hu, High temperature electronic transport properties of Fe-doped YBaCo2O5+δ, Physica B 394 (2007) 118-121.

DOI: 10.1016/j.physb.2007.02.027

Google Scholar