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Title: New insights on the synthesis and electronic transport in bulk polycrystalline Pr-doped SrTiO{sub 3−δ}

Recently, we have reported a significant enhancement in the electronic and thermoelectric properties of bulk polycrystalline SrTiO{sub 3} ceramics via praseodymium doping. This improvement was originated from the simultaneous enhancement in the thermoelectric power factor and reduction 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{sub 2}O{sub 3} versus Pr{sub 6}O{sub 11}) on the synthesis and electronic transport in Pr-doped SrTiO{sub 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{sub 3} ceramics and provide new insight on further improvement of the thermoelectric power factor.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634 (United States)
  2. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 (United States)
  3. Electron Microscope Facility, Clemson Research Park, Clemson University, Clemson, South Carolina 29634 (United States)
  4. Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 29634 (Saudi Arabia)
  5. (United States)
Publication Date:
OSTI Identifier:
22413062
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CERAMICS; CONCENTRATION RATIO; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; POLYCRYSTALS; PRASEODYMIUM; PRASEODYMIUM OXIDES; STRONTIUM TITANATES; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY; THERMOELECTRIC PROPERTIES