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 Effect of A-Site Cation Deficiency on the Thermoelectric Performance of Donor-Substituted Strontium Titanate
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/20906

title: Effect of A-Site Cation Deficiency on the Thermoelectric Performance of Donor-Substituted Strontium Titanate
authors: Kovalevsky, A. V.
Yaremchenko, A. A.
Populoh, S.
Weidenkaff, A.
Frade, J. R.
keywords: NB-DOPED SRTIO3
TRANSPORT-PROPERTIES
CERAMICS
OXIDES
CONDUCTIVITY
TEMPERATURE
BEHAVIOR
SENSORS
PHASES
DEFECT
issue date: 2014
publisher: AMER CHEMICAL SOC
abstract: Donor-substituted strontium titanate is known as one of the best highly performing n-type oxide thermoelectrics. In the present work, structural, microstructural, and thermoelectric properties of Sr1-xPrxTiO3 +/-delta, Sr1-1.5x PrxTiO3 +/-delta, and Sr1-yTi0.8Nb0.2O3 +/-delta (x = 0.05-0.30, y = 0-0.10) perovskite-type titanates were assessed to identify the impact of nominal A-site deficiency on thermoelectric performance. A large increase in power factor was observed for A-site nonstoichiometric materials at high donor-substitution level, provided by the favorable changes in electronic structure, defect chemistry, and microstructure. Complex dependence of the total conductivity and Seebeck coefficient on strontium deficiency suggests effects of microstructure on the electrical properties of Pr-and Nb-substituted ceramic samples. Formation of oxygen vacancies was found to suppress lattice thermal conductivity at low and intermediate temperatures, whereas the electronic part of the heat transfer increases for cation-deficient materials. For both Pr- and Nb-substituted titanates, introducing nominal A-site deficiency represents a promising strategy for improving performance.
URI: http://hdl.handle.net/10773/20906
ISSN: 1932-7447
publisher version/DOI: http://doi.org/10.1021/jp409872e
source: JOURNAL OF PHYSICAL CHEMISTRY C
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