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

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

›› 2015, Vol. 24 ›› Issue (4): 47201-047201.doi: 10.1088/1674-1056/24/4/047201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions

李宜^a, 刘剑^{a b}, 王春雷^{a b}, 苏文斌^{a b}, 祝元虎^a, 李吉超^{a b}, 梅良模^{a b}

a School of Physics, Shandong University, Jinan 250100, China;
b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

收稿日期:2014-08-06 修回日期:2014-09-25 出版日期:2015-04-05 发布日期:2015-04-05
基金资助:
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).

Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions

Li Yi (李宜)^a, Liu Jian (刘剑)^{a b}, Wang Chun-Lei (王春雷)^{a b}, Su Wen-Bin (苏文斌)^{a b}, Zhu Yuan-Hu (祝元虎)^a, Li Ji-Chao (李吉超)^{a b}, Mei Liang-Mo (梅良模)^{a b}

a School of Physics, Shandong University, Jinan 250100, China;
b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Received:2014-08-06 Revised:2014-09-25 Online:2015-04-05 Published:2015-04-05
Contact: Liu Jian E-mail:liujjx@sdu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

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

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.

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

中图分类号: (Thermoelectric and thermomagnetic effects)

72.15.Jf

72.20.Ee (Mobility edges; hopping transport)

李宜, 刘剑, 王春雷, 苏文斌, 祝元虎, 李吉超, 梅良模. Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions[J]. , 2015, 24(4): 47201-047201.

Li Yi (李宜), Liu Jian (刘剑), Wang Chun-Lei (王春雷), Su Wen-Bin (苏文斌), Zhu Yuan-Hu (祝元虎), Li Ji-Chao (李吉超), Mei Liang-Mo (梅良模). Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions[J]. Chin. Phys. B, 2015, 24(4): 47201-047201.

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Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions

Thermoelectric properties of Sr_0.61Ba_0.39Nb₂O_{6 -δ} ceramics in different oxygen-reduction conditions

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