Structural and Thermoelectric Properties of Zn-Doped Cuprous Aluminate Delafossite

Ngamnit Wongcharoen; Thitinai Gaewdang; Tiparatana Wongcharoen

doi:10.4028/www.scientific.net/AMR.747.333

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 747Structural and Thermoelectric Properties of...

Structural and Thermoelectric Properties of Zn-Doped Cuprous Aluminate Delafossite

Abstract:

The polycrystalline Zn-doped CuAlO₂ ceramics were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al₂O₃ and Zn (CH₃COO)₂2H₂O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1,150 °C for 24 h. XRD patterns showed the crystal structure of the as-sintered CuAl_1-xZn_xO₂ (0x0.05) belonging to rhombohedral, space groupalong with the CuO and CuAl₂O₄ phases. From SEM micrographs, the grain size slightly decreases when the amount of Zn in CuAl_1-xZn_xO₂ samples increases. Hall mobility and hole concentration of the as-sintered samples were obtained from Hall effect measurements in van der Pauw configuration at room temperature. The electrical resistivity measurements as a function of temperature were performed. The variation of Seebeck coefficient and power factor as a function of temperature was also investigated. In the present study, the Zn-doped CuAlO₂ ceramics probably have advantages for use in high temperature thermoelectric devices.

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Periodical:

Advanced Materials Research (Volume 747)

Pages:

333-336

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.747.333

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Online since:

August 2013

Authors:

Ngamnit Wongcharoen, Thitinai Gaewdang, Tiparatana Wongcharoen

Keywords:

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

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