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Author: search.filters.author.Wichainchai, AreeSubject: search.filters.subject.Seebeck coefficient

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    Item type:Publication,
    Reinvestigation thermoelectric properties of CuAlO2
    (2014-01-01)
    Ruttanapun, Chesta
    ;
    Kosalwat, Wattana
    ;
    Rudradawong, Chalermpol
    ;
    Jindajitawat, Phumin
    ;
    Buranasiri, Prathan
    Bulk CuAlO2 delafossite has been synthesized by solid state reaction to reinvestigate the thermoelectric properties. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured in a high temperature range of 300 to 960 K. The result of positive sign of Seebeck coefficient confirms p-type nature of CuAlO2 compund. The results of bulk sample for Seebeck coefficient, the electrical conductivity and thermal conductivity are range of 900 to 300 μV/K, of 0.01 to 2 S/cm, and of 3.5 W/mK to 1.5 W/mK. The maximum ZT value of bulk sample is 0.017 at a 960 K. These results can be concluded that the bulk CuAlO2 by solid state state displays thermoelelctric material.
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    Item type:Publication,
    Designing apparatus for highly precise measurement of electrical conductivity and seebeck coefficient from 85 k to 1200 k
    (2013-10-04)
    Budngam, Sopon
    ;
    Wichainchai, Aree
    ;
    Pimmongkol, Saichol
    ;
    Tipparach, Udom
    We describe the development of apparatus for measuring of electrical conductivity and Seebeck coefficient with high precision from 85 K to 1,200 K. Electrical resistance was measured by means of four-point probe method as a function of temperature. The temperature below 400 K was measured by using type T thermocouple in vacuum system was used and from 400 to 1,200 was measured by using Type S was applied for temperature between 400 and 1200 Kelvin in an inert gas system. With the dimensions of the specimen, the electrical resistivity (ρT) can be obtained in the unit of microohm-centimeter (μΩ - cm) and be written in polynomial, ρ<inf>T</inf> = -0.3191 + 6.8 × 10<sup>-3</sup>T - 6.0 × 10<sup>-7</sup> T<sup>2</sup> + 8.0 × 10<sup>-10</sup>T<sup>3</sup>. The electrical conductivity can be obtained by taking inversion of the electrical resistivity. Seebeck coefficient (α<inf>T</inf>) can be calculated in microvolt per Kelvin as follows: α<inf>T</inf> = 1.9653 - 1.49 × 10<sup>-2</sup>T + 9.0 × 10<sup>-5</sup>T<sup>2</sup> - 2.0 × 10<sup>-7</sup>T<sup>3</sup> + 2.0 × 10<sup>-10</sup>T<sup>4</sup> - 1.0 × 10<sup>-13</sup>T<sup>5</sup> + 3.0 × 10<sup>-17</sup>T<sup>6</sup> when T is temperature in K. The Seebeck coefficient data was compared with X-ray diffraction (XRD) and X-ray fluorescence (XRF) of the specimen. The result showed that our developrd apparatus yields the same as standard method when copper with purity greater than 99 percent was employed. © (2013) Trans Tech Publications, Switzerland.