TITLE

Enhancement of thermoelectric efficiency in oxygen-deficient Sr1-xLaxTiO3-δ ceramics

AUTHOR(S)
Liu, J.; Wang, C. L.; Su, W. B.; Wang, H. C.; Zheng, P.; Li, J. C.; Zhang, J. L.; Mei, L. M.
PUB. DATE
October 2009
SOURCE
Applied Physics Letters;10/19/2009, Vol. 95 Issue 16, p162110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report that the Seebeck coefficient (S) is remarkably enhanced in oxygen-deficient Sr1-xLaxTiO3-δ ceramics. The S values of all oxygen-deficient samples are larger than those of the near-stoichiometric ones and are temperature-independent at high temperatures, showing a narrow band behavior. This indicates that the introduction of oxygen vacancy changes the density of electronic states around the Fermi energy. The maximum for the figure of merit (ZT) of Sr0.9La0.1TiO3-δ ceramic reaches 0.21 at about 750 K, demonstrating enhancement by a factor of more than 1.3 over that of the near-stoichiometric materials.
ACCESSION #
44837231

 

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