Thermoelectric properties of CaMnO3 system

R. Funahashi, A. Kosuga, N. Miyasou, E. Takeuchi, S. Urata, K. Lee, H. Ohta, K. Koumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Citations (Scopus)

Abstract

Ca1-xRExMnO3 (RE: Nd, Tb, Ho, Yb, Lu, x = 0.1 and 0.2) bulks were prepared by a solid state reaction. They show metallic behavior at temperatures higher than about 400 K and electrical resistivity ρ is lower than 12 mΩ cm at 1000 K in air. Absolute values of Seebeck coefficient S increases with temperature up to 973 K for all samples except Ca0.9Yb0.1MnO3 at 973 K. For Ca 0.9Lu0.1MnO3, S value reaches -130 μV/K at 973 K. Both thermoelectric properties are dominated mainly by crystallographic structure. Power factor PF (=S2/ρ) increases with decreasing cell volume. Thermal conductivity K of Yb- and Lu-substituted samples is as low as 1.5 W/m-K2 and dimension-less figure of merit ZT reaches 0.16 at 973 K for Ca0.8Lu0.2MnO3 in air.

Original languageEnglish
Title of host publicationProceedings ICT'07 - 26th International Conference on Thermoelectrics
Pages124-128
Number of pages5
DOIs
Publication statusPublished - 2007
EventICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of
Duration: 2007 Jun 32007 Jun 7

Publication series

NameInternational Conference on Thermoelectrics, ICT, Proceedings

Other

OtherICT'07 - 26th International Conference on Thermoelectrics
CountryKorea, Republic of
CityJeju
Period07/6/307/6/7

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Funahashi, R., Kosuga, A., Miyasou, N., Takeuchi, E., Urata, S., Lee, K., Ohta, H., & Koumoto, K. (2007). Thermoelectric properties of CaMnO3 system. In Proceedings ICT'07 - 26th International Conference on Thermoelectrics (pp. 124-128). [4569439] (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2007.4569439