Thermoelectric properties of Sr0.61Ba0.39Nb2O6 -δ ceramics in different oxygen-reduction conditions

doi:10.1088/1674-1056/24/4/047201

Abstract The thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics, reduced in different conditions, are investigated in the temperature range from 323 K to 1073 K. The electrical transport behaviors of the samples are dominated by the thermal-activated polaron hopping in the low temperature range, the Fermi glass behavior in the middle temperature range, and the Anderson localized behavior in the high temperature range. The thermal conductivity presents a plateau at high-temperatures, indicating a glass-like thermal conduction behavior. Both the thermoelectric power factor and the thermal conductivity increase with the increase of the degree of oxygen-reduction. Taking these two factors into account, the oxygen-reduction can still contribute to promoting the thermoelectric figure of merit. The highest ZT value is obtained to be ～ 0.19 at 1073 K in the heaviest oxygen reduced sample.

Keywords: Sr_0.61Ba_0.39Nb₂O_{6 -δ} electrical transport mechanism thermoelectric figure of merit thermal conductivity

Received: 06 August 2014
Revised: 25 September 2014
Published: 05 April 2015

PACS:	72.15.Jf	(Thermoelectric and thermomagnetic effects)
	72.20.Ee	(Mobility edges; hopping transport)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB632506) and the National Natural Science Foundation of China (Grant Nos. 51202132 and 51002087).

Corresponding Authors: Liu Jian
E-mail: liujjx@sdu.edu.cn

Cite this article:

Li Yi, Liu Jian, Wang Chun-Lei, Su Wen-Bin, Zhu Yuan-Hu, Li Ji-Chao, Mei Liang-Mo Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions 2015 Chin. Phys. B 24 047201

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