Title :
Effect of Ag substitution for Co on thermoelectric properties of NaCo2O4
Author :
Anno, H. ; Egawa, S. ; Imai, Y. ; Matsubara, K
Author_Institution :
Sci. Univ. of Tokyo in Yamaguchi, Onoda, Japan
Abstract :
We have investigated the effect of Ag substitution for Co on thermoelectric properties of NaCo2O4. NaCo2-x AgxO4 compounds with x=0-0.4 were prepared by a solid-state reaction using NaCO3, Co3O4 , and Ag2O as starting materials. Measurements of the Seebeck coefficient, the electrical conductivity, and the thermal conductivity were made in the wide temperature range. Polycrystalline samples of p-type NaCo2-xAgxO4 were obtained for x=0-0.4. The electrical conductivity increased with increasing composition x, and the Seebeck coefficient was almost independent of x in the range of x=0-0.2. The effect of Ag substitution for Co on the electronic structure and thermoelectric properties of NaCo 2O4 is discussed from the transport properties, together with the results of x-ray photoelectron spectroscopy measurements
Keywords :
Seebeck effect; band structure; cobalt compounds; silver compounds; sodium compounds; thermal conductivity; thermoelectricity; Ag substitution; NaCo2-xAgxO4; NaCo2O4; Seebeck coefficient; electrical conductivity; electronic structure; thermal conductivity; thermoelectric properties; x-ray photoelectron spectroscopy; Conducting materials; Conductivity measurement; Electric variables measurement; Land surface temperature; Performance evaluation; Solid state circuits; Spectroscopy; Temperature distribution; Thermal conductivity; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2001. Proceedings ICT 2001. XX International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-7205-0
DOI :
10.1109/ICT.2001.979870
