Title :
Huge thermoelectromotive force generated by porous ceramics of Y 2O3
Author :
Koumoto, K. ; Seo, W.S. ; Ozawa, S.
Author_Institution :
Dept. of Appl. Chem., Nagoya Univ., Japan
Abstract :
Porous Y2O3 ceramic was found to show huge thermopower values up to -50 mV/K at 900-1000 K in vacuum, but not in air. Such huge thermopowers may be generated by the electron gas emitted from the internal surfaces of the pores and are associated with some unknown effects. The non-dimensional thermoelectric figure of merit, ZT, of this porous ceramic was as large as ~0.95 at ~950 K, and hence it can be used as a new thermoelectric material
Keywords :
ceramics; electron gas; porous materials; thermoelectric power; yttrium compounds; 900 to 1000 K; Y2O3; electron gas; huge thermoelectromotive force; pore internal surface; porous ceramics; thermoelectric figure of merit; thermopower; Ceramics; Chemistry; Electron emission; Force measurement; Insulation; Silicon germanium; Temperature dependence; Thermal conductivity; Thermal force; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 1997. Proceedings ICT '97. XVI International Conference on
Conference_Location :
Dresden
Print_ISBN :
0-7803-4057-4
DOI :
10.1109/ICT.1997.667187
