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

Soonil Lee; Rudeger H.T. Wilke; Susan Trolier-Mckinstry; Shujun Zhang; Clive A. Randall

doi:10.1063/1.3291563

_Srx _{Ba1-x Nb2} O6-δ Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

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

Research output: Contribution to journal › Article › peer-review

85 Scopus citations

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 language	English (US)
Article number	031910
Journal	Applied Physics Letters
Volume	96
Issue number	3
DOIs	https://doi.org/10.1063/1.3291563
State	Published - 2010

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3291563

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

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.",

author = "Soonil Lee and Wilke, {Rudeger H.T.} and Susan Trolier-Mckinstry and Shujun Zhang and Randall, {Clive A.}",

note = "Funding Information: This study is supported by the NSF under Grant No. 0628817. ",

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journal = "Applied Physics Letters",

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T1 - Srx Ba1-x Nb2 O6-δ Ferroelectric- thermoelectrics

T2 - Crystal anisotropy, conduction mechanism, and power factor

AU - Lee, Soonil

AU - Wilke, Rudeger H.T.

AU - Trolier-Mckinstry, Susan

AU - Zhang, Shujun

AU - Randall, Clive A.

N1 - Funding Information: This study is supported by the NSF under Grant No. 0628817.

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

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_Srx _{Ba1-x Nb2} O6-δ Ferroelectric- thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

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