Influence of rare earth doping on thermoelectric properties of SrTiO3 ceramics

Thermoelectric properties of SrTiO3 ceramics, doped with different rare earth elements, were investigated in this work. It's found that the ionic radius of doping elements plays an important role on thermoelectric properties: SrTiO3 ceramics doped with large rare earth ions (such as La, Nd, and...

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Bibliographic Details
Published in:Journal of applied physics 2013-12, Vol.114 (22)
Main Authors: Liu, J., Wang, C. L., Li, Y., Su, W. B., Zhu, Y. H., Li, J. C., Mei, L. M.
Format: Article
Language:English
Subjects:
Applied physics
Ceramics
Doping
Erbium
Gadolinium
Metal ions
Power factor
Properties (attributes)
Rare earth elements
Strontium titanates
Thermal conductivity
Thermoelectricity
Yttrium
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Summary:Thermoelectric properties of SrTiO3 ceramics, doped with different rare earth elements, were investigated in this work. It's found that the ionic radius of doping elements plays an important role on thermoelectric properties: SrTiO3 ceramics doped with large rare earth ions (such as La, Nd, and Sm) exhibit large power factors, and those doped with small ions (such as Gd, Dy, Er, and Y) exhibit low thermal conductivities. Therefore, a simple approach for enhancing the thermoelectric performance of SrTiO3 ceramics is proposed: mainly doped with large ions to obtain a large power factor and, simultaneously, slightly co-doped with small ions to obtain a low thermal conductivity. Based on this rule, Sr0.8La0.18Yb0.02TiO3 ceramics were prepared, whose ZT value at 1 023 K reaches 0.31, increasing by a factor of 19% compared with the single-doped counterpart Sr0.8La0.2TiO3 (ZT = 0.26).
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4847455