Enhancement of Thermoelectric Performance of Sr0.9‐xNd0.1Ti0.9Nb0.1O3 Ceramics by Introducing Sr Vacancies

• Published in: Physica status solidi. A, Applications and materials science Vol. 215; no. 21
• Main Authors: Chen, Yufei, Liu, Jian, Li, Xin, Li, Yi, Su, Wenbin, Li, Jichao, Zhao, LanLing, Wang, ChunLei, Lu, Minghui
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 07.11.2018
• Subjects: Carrier mobility; Ceramics; Electrical resistivity; Figure of merit; Lattice vacancies; Phonons; Point defects; Power factor; Seebeck effect; Sr vacancies; Sr0.9‐xNd0.1Ti0.9Nb0.1O3; Thermal conductivity; thermoelectric; Thermoelectricity
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.201800459

Thermoelectric properties of Sr‐deficient Sr0.9‐xNd0.1Ti0.9Nb0.1O3 ceramics are investigated in this work. Because of the significantly enhanced carrier mobility by introducing Sr vacancies, both of electrical conductivity and absolute Seebeck coefficient are enhanced, resulting in the improvement of power factor. Meanwhile, the lattice thermal conductivity decreases with the increasing content of Sr vacancies, indicating that Sr vacancies act as point defects and scatter phonons. Consequently, thermoelectric performance of Sr0.9‐xNd0.1Ti0.9Nb0.1O3 ceramics is enhanced obviously by introducing Sr vacancies, and the figure of merit ZT reaches a maximum of 0.32 at 1073 K in the sample x = 0.04, increasing by 60% as compared with that of the sample x = 0. Thermoelectric properties of Sr‐deficient Sr0.9‐xNd0.1Ti0.9Nb0.1O3 ceramics are investigated in this work. Because of the significantly enhanced carrier mobility by introducing Sr vacancies in SrTiO3, both of electrical conductivity and absolute Seebeck coefficient are enhanced, resulting in the improvement of power factor. So the thermoelectric properties of SrTiO3 ceramics is enhanced obviously.