Title :
Enhanced thermoelectric properties at x∼0.1 in La1-xSrxCoO3 and La1-xSrx(Co1-yMy)O3 (M=Cr, Cu)
Author :
Fujishiro, H. ; Fujine, Y. ; Kashiwada, Y. ; Ikebe, M. ; Hejtmanek, I.
Author_Institution :
Fac. of Eng., Iwate Univ., Morioka, Japan
Abstract :
The thermoelectric properties of the La1-xSrxCoO3 system have been investigated from 10 K to 300 K. The figure of merit Z and power factor P increase with increasing Sr concentration x and show a maximum for x=0.10-0.15, where the ferromagnetic (FM) order starts to appear. The maximum Z value (Z= 150 x 10-6 K-1 at 230 K for x=0.10) is larger than those of layered cobaltites. The Z and P values are enhanced by the 5 % Co-site substitution by Cr for the overdoped concentration (x=0.20), but are depressed for the nearly optimum doped one (x=0.15). The results are discussed in conjunction with the carrier density n of this system.
Keywords :
carrier density; chromium compounds; cobalt compounds; copper compounds; ferromagnetic materials; lanthanum compounds; strontium compounds; thermoelectricity; 10 to 300 K; 230 K; La1-xSrx(Co1-yCry)O3; La1-xSrx(Co1-yCuy)O3; La1-xSrxCoO3; carrier density; enhanced thermoelectric properties; ferromagnetic order; figure of merit; power factor; Chromium; Iron; Magnetic properties; Magnetization; Reactive power; State estimation; Strontium; Temperature dependence; Thermal conductivity; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2003 Twenty-Second International Conference on - ICT
Print_ISBN :
0-7803-8301-X
DOI :
10.1109/ICT.2003.1287492
