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The overall purposeof the present study is basically to understand the manifestation of the thermo-electricalproperties of the matrix ZnO-P2O5 first, and of the ZnO-P2O5 composites loaded with different volume fractions of nickel Ni as conductivefillers. In the matrix ZnO-P2O5, the values of electrical conductivity varied between 1.14 × 10-8 and 7.8 × 10-7 S-cm, and the Seebeck coefficient valuevaried between minimal value 265 and maximal value 670 μV-K in the studied temperature.In composite ZnO-P2O5-Ni, it was shown that the Seebeckcoefficient changed from high positive to negative values when the filleramount was increased, indicating a non-conducting to conducting phase transition. Such behavior exhibits that this transitionis accompanied by the passing of carrier charge from p to n type. Thestudy of thermoelectrically transport for high volume fraction of fillerenabled the achievement, for the first time on this kind of composites, of anoriginal transition called PTC transition. Thus, highest values of power factorPF = S2 ≈ 2 ×10-3 W·m-1·K-2 at407 K were obtained, giving a possibility of industrial applications.

KEYWORDS

Zinc Phosphate Glasses, Composites, Seebeck Coefficient, Power Factor

Cite this paper

Oabi, O. , Maaroufi, A. , Lucas, B. and Amrani, A. 2016 Thermoelectric Properties of ZnO-P2O5-Ni Composites. New Journal of Glass and Ceramics, 6, 19-27. doi: 10.4236-njgc.2016.63003.





Autor: Omar Oabi1, Abdelkarim Maaroufi1, Bruno Lucas2, Aumeur El Amrani3

Fuente: http://www.scirp.org/



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