Influence of rare earth doping on thermoelectric properties of SrTiO3 ceramics

J. Liu, C. L. Wang, Y. Li, W. B. Su, Y. H. Zhu, J. C. Li, L. M. Mei
2013 Journal of Applied Physics  
Effect of Pr substitution on structural and dielectric properties of SrTiO3 J. Appl. Phys. 112, 044106 (2012); 10.1063/1.4747937 Nb-doped SrTiO3 glass-ceramics as high temperature stable n-type oxide thermoelectrics AIP Conf. Recently, we have reported a significant enhancement in the electronic and thermoelectric properties of bulk polycrystalline SrTiO 3 ceramics via praseodymium doping. This improvement was originated from the simultaneous enhancement in the thermoelectric power factor and
more » ... duction in thermal conductivity, which was contributed to the non-uniform distribution of Pr dopants. In order to further understand the underlying mechanism, we herein investigate the role of praseodymium doping source (Pr 2 O 3 versus Pr 6 O 11 ) on the synthesis and electronic transport in Pr-doped SrTiO 3 ceramics. It was observed that the high-temperature electronic transport properties are independent of the choice of praseodymium doping source for samples prepared following our synthesis strategy. Theoretical calculations were also performed in order to estimate the maximum achievable power factor and the corresponding optimal carrier concentration. The result suggests the possibility of further improvement of the power factor. This study should shed some light on the superior electronic transport in bulk polycrystalline Pr-doped SrTiO 3 ceramics and provide new insight on further improvement of the thermoelectric power factor. V C 2015 AIP Publishing LLC.
doi:10.1063/1.4847455 fatcat:ymum3nfnarbf3acq4z67jdxdn4