The competition between phase stability and band gap in Yb-filled cobalt-free Fe4-yNiySb12 skutterudites

被引：1

作者：

Qiao, SaiSai ^{[1
]}

Zheng, Sikang ^{[1
]}

Huang, Yuling ^{[1
]}

Zhang, Bin ^{[2
]}

Liao, Huijun ^{[3
]}

Huang, Zhengyong ^{[3
]}

Li, Jian ^{[3
]}

Wang, Guiwen ^{[2
]}

Lu, Xu ^{[1
,3
]}

Zhou, Xiaoyuan ^{[1
,2
]}

机构：

[1] Chongqing Univ, Coll Phys, Ctr Quantum Mat & Devices, Chongqing 401331, Peoples R China

[2] Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China

[3] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Sec, Chongqing 400030, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 911卷

基金：

中国国家自然科学基金;

关键词：

A; skutterudites; B. thermoelectric properties; E. phase stability Ni substituting band gap; HIGH-THERMOELECTRIC PERFORMANCE; THERMAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; SUBSTITUTION; ANTIMONIDES; CE;

D O I：

10.1016/j.jallcom.2022.165052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the influence of Ni substituting for Fe on the phase stability and thermoelectric properties of YbxFe4-yNiySb(12) (x = 0.6, 0.7, 0.8, 0.9, 1.0; y = 1.0, 0.8, 0.6). Ni substituting can efficiently enhance phase stability but reduces band gap, which establishes an optimum Ni substituting content to keep the balance. Meanwhile, the atomic disorder caused by Ni substituting together with Yb-filling leads to a significant reduction in lattice thermal conductivity. The most marked reduction in lattice thermal conductivity is achieved in the Yb0.9Fe3.4Ni0.6Sb12 compound with a minimum value of 0.71 W m(-1) K-1 at about 650 K. Finally, a peak zT of 0.85 is attained at 673 K in the Yb(0.9)Fe(3.4)Ni(0.6)Sb(12)2 compound, which is comparable to other p-type skutterudites at the same temperature. This work highlights the importance of considering the competition between phase stability and band gap when designing high thermoelectric performance co-balt-free skutterudites.(C) 2022 Elsevier B.V. All rights reserved.

引用

页数：6