Hostname: page-component-745bb68f8f-cphqk Total loading time: 0 Render date: 2025-02-10T13:09:24.529Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of High Valence Metal Doping on Thermoelectric Properties of [Ca2CoO3-δ]0.62CoO2

Published online by Cambridge University Press:  01 February 2011

K. Fujie ,
S. Horii ,
I. Matsubara ,
W. Shin ,
N. Murayama ,
J. Shimoyama  and
K. Kishio
K. Fujie
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
S. Horii
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
I. Matsubara
Affiliation:
National Institute of Advanced Industrial Science and Technology, Osaka 563–8577, Japan
W. Shin
Affiliation:
National Institute of Advanced Industrial Science and Technology, Osaka 563–8577, Japan
N. Murayama
Affiliation:
National Institute of Advanced Industrial Science and Technology, Osaka 563–8577, Japan
J. Shimoyama
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332–0012, Japan
K. Kishio
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo 113–8656, Japan
Get access

Abstract

We report the synthesis and thermoelectric properties of high valence metal-doped [Ca2Co1-xMxO3-δ]0.62CoO2 (M = Re, Mo or Nb) compounds. Approximately 10% M-doping for Co sites in block layer was found to be effective for dramatic suppression of oxygen nonstoichiometries. Seebeck coefficients were systematically enhanced with M-doping levels (x), and however, electrical resistivities also increased with x for conventionally sintered bulk samples. On the other hand, magnetic alignment and/or densification were remarkably effective for reduction of the resistivity. In the case of Mo-doped (x = 0.1) sample, a highly c-axis aligned and densified sample showed 1–3 times larger power factor at 1100K (5.3 μ WK−2cm−1) than the non-doped one. Moreover, these high valence metal doped Ca349 compounds exhibited the oxygen nonstoichiometry suppressed dramatically.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 793: Symposium S – Thermoelectric Materials 2003 - Research and Applications , 2003 , S8.34
Copyright
Copyright © Materials Research Society 2004

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Terasaki, I., Sasago, Y., and Uchinokura, K.: Phys. Rev. B 56 (1997) R12685.Google Scholar
2. Ito, T., Kawata, T., Ktajima, T., and Terasaki, I.: Proc. 17th Int. Conf. Thermoelectrics (ICT '98) (IEEE, Piscataway, 1999) p. 595.Google Scholar
3. Shin, W. and Murayama, N.: J. Mater. Res. 15 (2002) 382.Google Scholar
4. Masset, A.C., Michel, C., Maignan, A., Hervieu, M., Toulemonde, O., Studer, F. and Raveau, B.: Phys. Rev. B 62 (2000) 166.Google Scholar
5. Miyazaki, Y., Kudo, K., Akoshima, M., Ono, Y., Koike, Y. and Kajitani, T.: Jpn. J. Appl. Phys. 39 (2000) L531.Google Scholar
6. Funahashi, R., Matsubara, I., Ikuta, H., Takeuchi, T., Mizutani, U. and Sodeoka, S.: Jpn. J. Appl. Phys. 39 (2000) L1127.Google Scholar
7. Sano, M., Horii, S., Matsubara, I., Funahashi, R., Shikano, M., Shimoyama, J. and Kishio, K.: Jpn. J. Appl. Phys. 42 (2003) L198.Google Scholar
8. Horii, S., Matsubara, I., Sano, M., Fujie, K., Suzuki, M., Funahashi, R., Shikano, M., Shin, W., Murayama, N., Shimoyama, J. and Kishio, K.: Jpn. J. Appl. Phys. 42 (2003) 7018.Google Scholar
9. Shimoyama, J., Horii, S., Otzschi, K., Sano, M. and Kishio, K.: Jpn. J. Appl. Phys. 42 (2003) L194.Google Scholar
10. Koshibae, W., Tsutsui, K. and Maekawa, S.: Phys. Rev. B 62 (2000) 6869.Google Scholar