Thermoelectric properties of Li-doped Sr0.7Ba0.3Nb2O6-δ ceramics

doi:10.1088/1674-1056/26/10/107201

Abstract

Thermoelectric properties of Li-doped Sr_0.70Ba_0.30Nb₂O_6-δ ceramics were investigated in the temperature range from 323 K to 1073 K. The electrical conductivity increases significantly after lithium interstitial doping. However, both of the magnitudes of Seebeck coefficient and electrical conductivity vary non-monotonically but synchronously with the doping contents, indicating that doped lithium ions may not be fully ionized and oxygen vacancy may also contribute to carriers. The lattice thermal conductivity increases firstly and then decreases as the doping content increases, which is affected by competing factors.Thermoelectric performance is enhanced by lithium interstitial doping due to the increase of the power factor and the thermoelectric figure of merit reaches maximum value (0.21 at 1073 K) in the sample Sr_0.70Ba_0.30Li_0.10Nb₂O₆.

Keywords: Sr_0.7Ba_0.3Nb₂O_6-δ interstitial doping thermoelectric properties

Received: 22 June 2017
Revised: 24 July 2017
Accepted manuscript online:

PACS:	72.20.Pa	(Thermoelectric and thermomagnetic effects)
	72.80.Ga	(Transition-metal compounds)

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, 51231007, and 11374186).

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

Cite this article:

Ya-Cui Zhang(张亚翠), Jian Liu(刘剑), Yi Li(李宜), Yu-Fei Chen(陈宇飞), Ji-Chao Li(李吉超), Wen-Bin Su(苏文斌), Yu-Cheng Zhou(周昱成), Jin-Ze Zhai(翟近泽), Teng Wang(王腾), Chun-Lei Wang(王春雷) Thermoelectric properties of Li-doped Sr_0.7Ba_0.3Nb₂O_6-δ ceramics 2017 Chin. Phys. B 26 107201

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Thermoelectric properties of Li-doped Sr0.7Ba0.3Nb2O6-δ ceramics

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Thermoelectric properties of Li-doped Sr_0.7Ba_0.3Nb₂O_6-δ ceramics