Thermoelectric properties of perovskite-type oxides are investigated with particular interests in their hopping carrier mobility. A series of partial substitution for metal cations in CaMnO 3 , a perovskite-type oxide showing small polaron hopping conduction, reveals that larger substituents for both Ca and Mn sites result in higher carrier mobilities. Consequently, Bi and In attain the largest ZT values for the Ca and Mn site substitutions, respectively. Increase in the hopping intersite distance is suggested as a reason of the enhanced mobilities. As a consequence, the largest substituent for the Mn site, In, gives the highest mobility, and thereby brings about the largest power factor for Ca(Mn 0.9 In 0.1 )O 3 . Also benefiting from the fairly low thermal conductivity, the In-substituted sample attains ZT = 0.16 at 900 °C.
|Number of pages||4|
|Publication status||Published - Dec 1 1997|
|Event||Proceedings of the 1997 16th International Conference on Thermoelectrics, ICT'97 - Dresden, Ger|
Duration: Aug 26 1997 → Aug 29 1997
|Other||Proceedings of the 1997 16th International Conference on Thermoelectrics, ICT'97|
|Period||8/26/97 → 8/29/97|
All Science Journal Classification (ASJC) codes