Title :
Search for p-type oxide thermoelectrics - cobaltites
Author :
Fujishiro, H. ; Fujine, Y. ; Hejtmanek, J. ; Sedmidubsky, D. ; Maignan, A. ; Martin, C.
Author_Institution :
Fac. of Eng., Iwate Univ., Morioka, Japan
Abstract :
The thermal conductivity, thermoelectric power, electrical resistivity and magnetization of the 3D perovskites Ln1-xAEXCoO3 (Ln=La,Y and AE=Ca and Ba) and the low dimensional Ca3Co2O6 and Ca3Co4O9 cobaltites were measured in a wide temperature range up to 1000 K. As a novelty we demonstrate the prospective high power factor of the. Y0.9Ca0.1CoO3 at high temperatures and, simultaneously, that in the La1-XAEXCoO3 system the maximum Z and P values are observed at the phase boundary between the FM and SG state at X∼0.1 and exceed that reported for layered cobaltite ceramics.
Keywords :
barium compounds; calcium compounds; cobalt compounds; electrical resistivity; lanthanum compounds; magnetisation; semiconductor materials; thermoelectricity; yttrium compounds; 1000 K; Ca3Co2O6; Ca3Co4O9; LaBaCoO3; Ln1-xAEXCoO3; Y0.9Ca0.1CoO3; cobaltites; electrical resistivity; layered cobaltite ceramics; magnetization; p-type oxide thermoelectrics; thermal conductivity; thermoelectric power; Conductivity measurement; Electric resistance; Electric variables measurement; Magnetization; Power measurement; Temperature distribution; Thermal conductivity; Thermal factors; Thermal resistance; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2003 Twenty-Second International Conference on - ICT
Print_ISBN :
0-7803-8301-X
DOI :
10.1109/ICT.2003.1287481
