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Thermoelectric Properties of ZnO-P2O5/(Ni) Composites
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作者 Omar Oabi abdelkarim maaroufi +1 位作者 Bruno Lucas Aumeur El Amrani 《New Journal of Glass and Ceramics》 2016年第3期19-27,共10页
The overall purpose of the present study is basically to understand the manifestation of the thermo-electrical properties of the matrix ZnO-P<sub>2</sub>O<sub>5</sub> first, and of the ZnO-P<... The overall purpose of the present study is basically to understand the manifestation of the thermo-electrical properties of the matrix ZnO-P<sub>2</sub>O<sub>5</sub> first, and of the ZnO-P<sub>2</sub>O<sub>5</sub> composites loaded with different volume fractions of nickel (Ni) as conductive fillers. In the matrix ZnO-P<sub>2</sub>O<sub>5</sub>, the values of electrical conductivity varied between 1.14 × 10<sup>-8</sup> and 7.8 × 10<sup>-7</sup> (S/cm), and the Seebeck coefficient value varied between minimal value 265 and maximal value 670 (μV/K) in the studied temperature. In composite ZnO-P<sub>2</sub>O<sub>5</sub>/Ni, it was shown that the Seebeck coefficient changed from high positive to negative values when the filler amount was increased, indicating a non-conducting to conducting phase transition. Such behavior exhibits that this transition is accompanied by the passing of carrier charge from p to n type. The study of thermoelectrically transport for high volume fraction of filler enabled the achievement, for the first time on this kind of composites, of an original transition called PTC transition. Thus, highest values of power factor (PF = S<sup>2</sup> ≈ 2 × 10<sup>-3</sup> W·m<sup>-1</sup><sub>·</sub>K<sup>-2</sup> at 407 K) were obtained, giving a possibility of industrial applications. 展开更多
关键词 Zinc Phosphate Glasses COMPOSITES Seebeck Coefficient Power Factor
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