Innovative synthesis of mesostructured CoSb3-based skutterudites by magnesioreduction

被引：13

作者：

Le Tonquesse, Sylvain ^{[1
]}

Alleno, Eric ^{[2
]}

Demange, Valerie ^{[1
]}

Dorcet, Vincent ^{[1
]}

Joanny, Loic ^{[1
]}

Prestipino, Carmelo ^{[1
]}

Rouleau, Olivier ^{[2
]}

Pasturel, Mathieu ^{[1
]}

机构：

[1] Univ Rennes, CNRS, ISCR UMR6226 ScanMAT UMS2001, F-35000 Rennes, France

[2] Univ Paris Est, Inst Chim & Mat Paris Est, UMR 7182 CNRS, UPEC, 2 Rue H Dunant, F-94320 Thiais, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 796卷

关键词：

Intermetallics; Thermoelectric materials; Chemical synthesis; Powder metallurgy; Microstructure; FIGURE-OF-MERIT; THERMOELECTRIC PROPERTIES; FILLED SKUTTERUDITE; THERMAL-CONDUCTIVITY; PHASE-EQUILIBRIA; PERFORMANCE; COSB3; NI; ENHANCEMENT; REDUCTION;

D O I：

10.1016/j.jallcom.2019.04.324

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：

High purity CoSb3, Ni0.06Co0.94Sb3 and In0.13Co4Sb12 were synthesized from oxides by magnesioreduction. This novel synthesis route to CoSb3-based skutterudites directly yields highly crystalline powders with submicronic grain size. Densifled mesostructured pellets with an average grain size ranging between 550 and 800 nm were obtained by spark plasma sintering. The strong phonon scattering induced by the mesostructuration leads to a lattice thermal conductivity reduction up to 25% for CoSb3 and Ni0.06Co0.94Sb3 at 300 K without significantly degrading the electronic properties. Consequently, maximum ZT figures-of-merit of 0.09, 0.60 and 0.75 are found for CoSb3, Ni0.06Co0.94Sb3 and In0.13Co4Sb12, respectively, showing the ability of this scalable process to reach the best performances reported in literature for these compositions at moderate temperature and annealing duration. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：176 / 184

页数：9

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