Enhancement of thermoelectric performance of Sr0.7Ba0.3Nb2O6−δ ceramics by lanthanum doping. Issue 1 (January 2016)

• Record Type: Journal Article
• Authors: Li, Yi; Liu, Jian; Zhang, Yacui; Zhou, Yucheng; Li, Jichao; Su, Wenbin; Zhai, Jinze; Wang, Hongchao; Wang, Chunlei
• Is Part Of: Ceramics international. Volume 42:Issue 1:Part B(2016)
• Page Start: 1128
• Page End: 1132
• Publication Date: 2016-01
• Subjects: Thermoelectric -- Sr0.7Ba0.3Nb2O6−δ -- La-doping -- ZT; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.09.041
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Thermoelectric properties of La doped Sr0.7 Ba0.3 Nb2 O6- δ ceramics were investigated in the temperature range from 323 K to 1073 K. The electrical resistivity decreases due to the subsitution of La for Sr, leading to the enhancement of thermoelectric power factor in the heavily doped sample Sr0.50 La0.20 Ba0.30 Nb2 O6− δ . Slight La-doping promotes the growth of Sr0.7 Ba0.3 Nb2 O6− δ grains, but it will be impeded in the heavily La doped samples. Thus, La heavily doped sample Sr0.50 La0.20 Ba0.30 Nb2 O6− δ shows low thermal conductivity because of the phonon scattering caused by grain boundaries. The highest thermoelectric performance was observed in the sample Sr0.50 La0.20 Ba0.30 Nb2 O6− δ, and the thermoelectric figure of merit reaches the maximum value ~0.22 at 1073 K.