Srx Ba1-x Nb2 O6-δ Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

Soonil Lee, Rudeger H.T. Wilke, Susan E. Trolier-McKinstry, Shujun Zhang, Clive A. Randall

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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.

Original languageEnglish (US)
Article number031910
JournalApplied Physics Letters
Volume96
Issue number3
DOIs
StatePublished - Mar 29 2010

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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