Synthesis, sintering, and thermoelectric properties of Co1-xMxO (M = Na, 0 ≤ x ≤ 0.07; M = Ag, 0 ≤ x ≤ 0.05)

被引：8

作者：

Chen, Cong ^{[1
,2
]}

Delorme, Fabian ^{[1
]}

Schoenstein, Frederic ^{[3
]}

Zaghrioui, Mustapha ^{[1
]}

Flahaut, Delphine ^{[4
]}

Allouche, Joachim ^{[4
]}

Giovannelli, Fabien ^{[1
]}

机构：

[1] Univ Tours, CNRS, INSA, GREMAN UMR 7347,IUT Blois, 15 Rue Chocolaterie,CS 2903, F-41029 Blois, France

[2] Bundesanstalt Mat Forsch & Prufung BAM, Unter Eichen 87, D-12205 Berlin, Germany

[3] Univ Paris 13, Sorbonne Paris Cite, CNRS, LSPM,UPR 3407, 99 Ave JB Clement, F-93430 Villetaneuse, France

[4] Univ Pau & Pays Adour, CNRS, Inst Sci Analyt & Physicochim Environm & Mat, UPPA E2S,UMR5254, F-64000 Pau, France

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 2-3期

关键词：

CoO; Substitution; Spark plasma sintering; XPS; Thermoelectrics; ELECTRICAL-PROPERTIES; DEFECT STRUCTURE; COO; THERMOPOWER; CONDUCTION; CA3CO4O9; SCATTERING; STABILITY; DIFFUSION; FIGURE;

D O I：

10.1016/j.jeurceramsoc.2018.10.013

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structural and thermoelectric properties of Na- and Ag-substituted CoO dense ceramics have been investigated. X-ray diffraction shows that pure phase and Ag/CoO composites have been obtained for Na-doped and Ag-doped CoO, respectively. Raman spectroscopy shows an effect of Na dopants on the lattice disorder of CoO. The chemical composition, element distribution, and valence states of the samples have been characterized by Auger electron microscopy and X-ray photoelectron spectroscopy. Substitution of Co by 5 at. % Na enhances the power factor to 250 mu W m(-1) K-2 at 1000 K, similar to that of Ca3Co4O9. The corresponding thermal conductivity is also reduced to 3.55 W.m(-1) K-1 at 1000 K. Consequently, Co0.95Na0.05O exhibits the best thermoelectric figure of merit (ZT), which is 0.07 at 1000 K. On the other hand, the substitution of Ag into CoO leads to the formation of CoO/Ag composites and deteriorates ZT values.

引用

页码：346 / 351

页数：6

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