Solubility study of Y in n-type YxCe0.15Co4Sb12 skutterudites and its effect on thermoelectric properties

被引：24
作者：
Qin, D. [1 ]
Shi, W. [1 ]
Xue, W. [2 ]
Qin, H. [1 ]
Cao, J. [1 ]
Cai, W. [3 ]
Wang, Y. [2 ]
Sui, J. [1 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[3] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
MATERIALS TODAY PHYSICS | 2020年 / 13卷
基金：
中国国家自然科学基金;
关键词：
Skutterudites; Y auxiliary filler; Lattice thermal conductivity; Thermoelectric properties; LATTICE THERMAL-CONDUCTIVITY; PERFORMANCE; ZT; FIGURE; MERIT; CONVERGENCE; ANTIMONIDES; SR;
D O I：
10.1016/j.mtphys.2020.100206
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Low-cost Ce has been proved to be an effective auxiliary filler for performance tuning in CoSb3-based skutterudite, one of the most promising thermoelectric materials at medium temperature. However, the low solubility of Ce in CoSb3 makes its overall thermoelectric properties so far inferior to that with expensive and scarce Yb filler. Herein, using non-equilibrium processing, we successfully synthesized a series of double-filled skutterudites with Ce as the dominating filling element and Y as the auxiliary filler. Our investigation shows that Y filling not only optimizes the carrier concentration and thus enhances the overall power factor but also introduces additional phonon scattering and hence leads to significantly suppressed lattice thermal conductivity. The concurrently optimized electrical and thermal properties realize the maximum ZT of similar to 1.37 at 873 K in the Y0.05Ce0.15Co4Sb12 sample, prevailing over the other involved Ce single- or even double-filled skutterudites, which will potentially facilitate a widespread application of filled skutterudites. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：7
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