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SrxBa1-x Nb2 O6-d Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

Journal Article


Abstract


  • Nonstoichiometric tungsten bronze-structured ferroelectric Srx Ba1-x Nb2 O6-δ (SBN) single crystals were found to be a promising n-type thermoelectric oxide. Thermopower anomalies were observed at the phase transition temperatures, depending on the degree of reduction as well as crystal anisotropy. Above 500 K, heavily reduced SBN crystals show high thermoelectric power factors (∼20 μW/cm K2 at 516 K) with both thermopower and electrical conductivity higher parallel to the c-axis. It is noted that the power factor increases with temperature due to the semiconducting behavior with high carrier concentration. The carrier transport mechanism also varies with the degree of reduction and temperature. © 2010 American Institute of Physics.

Publication Date


  • 2010

Citation


  • Lee, S., Wilke, R. H. T., Trolier-Mckinstry, S., Zhang, S., & Randall, C. A. (2010). SrxBa1-x Nb2 O6-d Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor. Applied Physics Letters, 96(3). doi:10.1063/1.3291563

Scopus Eid


  • 2-s2.0-77949840350

Volume


  • 96

Issue


  • 3

Abstract


  • Nonstoichiometric tungsten bronze-structured ferroelectric Srx Ba1-x Nb2 O6-δ (SBN) single crystals were found to be a promising n-type thermoelectric oxide. Thermopower anomalies were observed at the phase transition temperatures, depending on the degree of reduction as well as crystal anisotropy. Above 500 K, heavily reduced SBN crystals show high thermoelectric power factors (∼20 μW/cm K2 at 516 K) with both thermopower and electrical conductivity higher parallel to the c-axis. It is noted that the power factor increases with temperature due to the semiconducting behavior with high carrier concentration. The carrier transport mechanism also varies with the degree of reduction and temperature. © 2010 American Institute of Physics.

Publication Date


  • 2010

Citation


  • Lee, S., Wilke, R. H. T., Trolier-Mckinstry, S., Zhang, S., & Randall, C. A. (2010). SrxBa1-x Nb2 O6-d Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor. Applied Physics Letters, 96(3). doi:10.1063/1.3291563

Scopus Eid


  • 2-s2.0-77949840350

Volume


  • 96

Issue


  • 3