Significant enhancement in thermoelectric properties of polycrystalline Pr-doped SrTiO{sub 3−δ} ceramics originating from nonuniform distribution of Pr dopants

Journal Article · Mon May 12 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4875925· OSTI ID:22273434

Bhattacharya, Sriparna; He, Jian ^[1]; Alshareef, Husam N. ^[2]

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1. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 (United States)
2. Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900 (Saudi Arabia)

Recently, we have reported a significant enhancement (>70% at 500 °C) in the thermoelectric power factor (PF) of bulk polycrystalline Pr-doped SrTiO{sub 3} ceramics employing a novel synthesis strategy which led to the highest ever reported values of PF among doped polycrystalline SrTiO{sub 3}. It was found that the formation of Pr-rich grain boundary regions gives rise to an enhancement in carrier mobility. In this Letter, we investigate the electronic and thermal transport in Sr{sub 1−x}Pr{sub x}TiO{sub 3} ceramics in order to determine the optimum doping concentration and to evaluate the overall thermoelectric performance. Simultaneous enhancement in the thermoelectric power factor and reduction in thermal conductivity in these samples resulted in more than 30% improvement in the dimensionless thermoelectric figure of merit (ZT) for the whole temperature range over all previously reported maximum values. Maximum ZT value of 0.35 was obtained at 500 °C.

• OSTI ID: 22273434
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARRIER MOBILITY
CERAMICS
DOPED MATERIALS
GRAIN BOUNDARIES
POLYCRYSTALS
STRONTIUM TITANATES
THERMAL CONDUCTIVITY
THERMOELECTRIC PROPERTIES