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Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy

Wang, Xiao-yu, Wang, Hui-juan, Xiang, Bo, Shang, Hong-jing, Zhu, Bin, Yu, Yuan, Jin, Hui, Zhao, Run-fei, Huang, Zhong-yue, Liu, Lan-jun, Zu, Fang-qiu, Chen, Zhi-gang
Journal of materials science 2019 v.54 no.6 pp. 4788-4797
alloys, electrical conductivity, liquids, microstructure, milling, temperature, thermal conductivity
Undoped n-type Bi₂Te₃ bulks were prepared via the liquid state manipulation (LSM) with subsequent ball milling and spark plasma sintering processes. The sample with LSM obtains higher carrier concentration and larger effective mass compared with that without LSM, exhibiting favourable electrical transport properties. More importantly, a much reduced lattice thermal conductivity ~ 0.47 W m⁻¹ K⁻¹ (decreased by 43%) is obtained, due to the enhanced multiscale phonon scattering from hierarchical microstructures, including boundaries, nanograins and lattice dislocations. Additionally, due to the increased carrier concentration and enlarged band gap, the bipolar effect is effectively suppressed in sample BT-LSM. Consequently, zTₘₐₓ ~ 0.66 is achieved in the sample with LSM at higher temperature of 475 K, almost 22% improvement compared with that of the contrast.