[en] [Bi1.68Ca2O4](RS)[CoO2](1.69) (BCCO) sample and Ag-BCCO composites (with 10, 20 or 30 wt% Ag) have been prepared by the spray-drying technique and uniaxially/isostatically packed. Scanning electron microscopy reveals that the Ag particles are well distributed in the BCCO cobaltite matrix at low Ag contents. The Ag particles have an important effect on densification and grain orientation of the samples, with a direct impact on their electrical conductivity. The electrical conductivity is higher for the uniaxial samples and increases with the Ag content up to 20% in weight, while the Seebeck coefficient is hardly affected. These features induce an improvement of the power factor, reaching a maximum value of 2.2 mu W K-2 cm(-1) at similar to 1050 K for the uniaxial sample with 20 wt% Ag. Our results suggest that the spray-drying technique is a promising method to obtain composites with a well-dispersed secondary phase. (C) 2010 Elsevier Masson SAS. All rights reserved.
Disciplines :
Physics Chemistry
Author, co-author :
Rivas-Murias, B.; Université de Liège - ULiège > LCIS-Greenmat
Muguerra, Hervé ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Traianidis, M.; BCRC - Mons
Henrist, Catherine ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Vertruyen, Bénédicte ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT - Doyen de la Faculté des Sciences
Language :
English
Title :
Enhancement of the power factor of [Bi1.68Ca2O4](RS)[CoO2](1.69) - Ag composites prepared by the spray-drying method
Publication date :
2010
Journal title :
Solid State Sciences
ISSN :
1293-2558
Publisher :
Elsevier Science, Paris, France
Volume :
12
Issue :
8
Pages :
1490-1495
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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