Mesostructured thermoelectric Co1-yMySb3 (M = Ni, Pd) skutterudites

被引：17

作者：

Alleno, E. ^{[1
]}

Zehani, E. ^{[1
]}

Gaborit, M. ^{[1
]}

Orodniichuk, V. ^{[2
]}

Lenoir, B. ^{[2
]}

Benyahia, M. ^{[1
]}

机构：

[1] Univ Paris Est, CNRS UPEC, Inst Chim & Mat Paris Est, UMR 7182, 2-8 Rue H Dunant, F-94320 Thiais, France

[2] Univ Lorraine, CNRS, Inst Jean Lamour, UMR 7198, Nancy, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 692卷

关键词：

Thermoelectricity; Skutterudite; Grain growth; Thermal conductivity; Electronic properties; LIGHTLY DOPED COSB3; NORMAL GRAIN-GROWTH; TRANSPORT-PROPERTIES; THERMAL-CONDUCTIVITY; ELECTRICAL-PROPERTIES; ELECTRONIC TRANSPORT; SILICON NANOWIRES; BULK ALLOYS; MERIT; PERFORMANCE;

D O I：

10.1016/j.jallcom.2016.09.094

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：

n-type skutterudites Co0.97Pd0.03Sb3 + nano-CeO2 and Co0.94Ni0.06Sb3 + nano-CeO2 nanocomposites were synthesized by ball milling and spark plasma sintering in order to promote phonon scattering at the grain boundaries. Addition of nano-CeO2 slows down the grain size growth of the skutterudite matrix which occurs during sintering, leading to grain sizes as small as respectively 220 and 170 nm in Co0.97Pd0.03Sb3 + 2% CeO2 and Co0.94Ni0.06Sb3 + 3% CeO2. Subsequently, the lattice thermal conductivity is reduced by up to 47% at 300 K. An experimental value of similar to 110 nm can be estimated for the bulk phonon mean free path in both compounds. In Co0.94Ni0.06Sb3 + 3% CeO2, an improved ZT (similar to 0.7) is obtained at 700 K. Annealing Co0.97Pd0.03Sb3 + 2% CeO2 at 825 K leads to a slightly increased grain size (240 nm), which remains stable on a long term (95 days). (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：676 / 686

页数：11

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