Abstract
We have investigated the thermoelectric (TE) properties for single crystals of the perovskites Sr1−x Ca x Ti1−y Nb y O3 for 0 ≤ x ≤ 0.4 and 0 ≤ y ≤ 0.03 at temperatures below room temperature (RT). We found that SrTi0.99Nb0.01O3 showed a large power factor at low temperatures (PF = 50 µW/K2cm at 100 K ∼ 90 µW/K2cm at 50 K) and the largest dimensionless TE figure-ofmerit at temperatures below 40 K (ZT ∼ 0.07) among the reported materials. Such a large low-temperature TE response around a carrier concentration of 1020 cm−3 is due to a distinct phonon drag effect. We also found that the Ca2+ substitution for Sr2+ increased the ZT at 300 K for Sr1−x Ca x Ti0.97Nb0.03O3 from 0.08 to 0.105. The enhancement of the ZT around RT originates both from a large reduction of a thermal conductivity due to a randomness introduced into the crystal structure and from an unexpected enhancement of a Seebeck coefficient.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
G. D. Mahan, Solid State Phys. 51, 81 (1998).
I. Terasaki, Y. Sasago and K. Uchinokura, Phys. Rev. B 56, 12685 (1997).
R. Funahashi, I. Matsubara, H. Ikuta, T. Takeuchi, U. Mizutani and S. Sodeoka, Jpn. J. Appl. Phys. 39, L1127 (2000).
R. Funahashi and M. Shikano, Appl. Phys. Lett. 81, 1459 (2002).
M. Ito, T. Nagira, D. Furumoto, S. Katsuyama and H. Nagai, Scripta Mat. 48, 403 (2003).
M. Ohtaki, T. Tsubota, K. Eguchi and H. Arai, J. Appl. Phys. 79, 1816 (1996).
T. Okuda, K. Nakanishi, S. Miyasaka and Y. Tokura, Phys. Rev. B 63, 113104 (2001).
S. Ohta, T. Nomura, H. Ohta and K. Koumoto, J. Appl. Phys. 97, 034106 (2005).
M. Ohtaki, H. Koga, T. Tokunaga, K. Eguchi and H. Arai, J. Solid State Chem. 120, 105 (1995).
J. Fukuyado, K. Narikiyo, M. Akaki, H. Kuwahara and T. Okuda, Phys. Rev. B 85, 075112 (2012).
D. K. C. MacDonald, in Principles of Thermoelectricity (John Weily and Sons, Inc., New York, 1964).
R. E. Cohen, Nature 358, 136 (1992).
E. Dagotto, T. Hotta and A. Moreo, Phys. Rep. 344, 1 (2001).
T. Okuda and Y. Fujii, J. Appl. Phys. 108, 103702 (2010).
H. W. Zandbergen, M. Foo, Q. Xu, V. Kumar and R. J. Cava, Phys. Rev. B 70, 024101 (2004).
M. Roger, D. J. P. Morris, D. A. Tennant, M. J. Gutmann, J. P. Goff, J.-U. Hoffmann, R. Feyerherm, E. Dudzik, D. Prabhakaran, A. T. Boothroyd, N. Shannon, B. Lake and P. P. Deen, Nature 445, 631 (2007).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Okuda, T., Fukuyado, J., Narikiyo, K. et al. Low-temperature thermoelectric properties of the electron-doped perovskites Sr1−x Ca x Ti1−y Nb y O3 . Journal of the Korean Physical Society 63, 428–432 (2013). https://doi.org/10.3938/jkps.63.428
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.63.428