Enhanced thermoelectric properties of n-type direction solidified Bi2Te2.7Se0.3 alloys by manipulating its liquid state. (15th March 2018)

• Record Type: Journal Article
• Authors: Zhu, Bin; Huang, Zhong-Yue; Wang, Xiao-Yu; Yu, Yuan; Gao, Na; Zu, Fang-Qiu
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 192
• Page End: 195
• Publication Date: 2018-03-15
• Subjects: Thermoelectric materials -- Direction solidification -- Power factor -- Dimensionless figure of merit -- Liquid state manipulation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.045
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Liquid state manipulation (LSM) has been applied to prepare direction solidified Bi2 Te2.7 Se0.3 bulk alloys. The maintained strong texturing and increased effective mass benefits the power factor. Moreover, the lattice thermal conductivity in Bi2 Te2.7 Se0.3 reduces to 0.55 Wm − 1 K − 1 at 490 K after LSM. As a result, the largest ZT value of 1.10 is achieved for the sample experienced LSM, which is increased by 20% compared with that unexperienced LSM. The average ZT value for LSM sample rises from 0.80 to 1.02, which makes this material suitable for application in the wide temperature range. Graphical abstract: Image 1