Improvement of the thermoelectric properties of [Bi{sub 1.68}Ca{sub 2}O{sub 4-{delta}}]{sup RS}[CoO{sub 2}]{sub 1.69} cobaltite by chimie douce methods
- Inorganic Materials Chemistry, Department of Chemistry, University of Liege, Allee de la Chimie 3 (Bat. B6), 4000 Liege (Belgium)
- Belgian Ceramic Research Centre, Avenue Gouverneur Cornez 4, 7000 Mons (Belgium)
[Bi{sub 1.68}Ca{sub 2}O{sub 4-{delta}}]{sup RS}[CoO{sub 2}]{sub 1.69} has been obtained by different chimie douce methods and uniaxially or isostatically pressed. The influence of these parameters on the thermoelectric properties has been investigated. Contrary to the Seebeck coefficient, which remains unchanged, the electrical conductivity is greatly modified. In particular, spray-drying synthesis followed by uniaxial pressing results in an electrical conductivity two times larger than in the case of conventional solid state synthesis. Our results suggest that a narrow particle size distribution is beneficial to the thermoelectric properties of the layered compounds. The spray-drying technique seems to be promising to improve the electrical conductivity of layered materials. Moreover, this method presents other advantages (homogeneous samples and less energetic processing) which could be interesting to the future manufacturing of thermoelectric devices. - Graphical abstract: Small particles and narrow size distribution is obtained for spray-drying [Bi{sub 1.68}Ca{sub 2}O{sub 4}]{sup RS}[CoO{sub 2}]{sub 1.69} cobaltate. The power factor is boosted up two times compared with the conventional solid state method.
- OSTI ID:
- 21421508
- Journal Information:
- Journal of Solid State Chemistry, Vol. 183, Issue 6; Other Information: DOI: 10.1016/j.jssc.2010.03.030; PII: S0022-4596(10)00120-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
COBALT COMPOUNDS
ELECTRIC CONDUCTIVITY
OXIDES
PARTICLE SIZE
PRESSING
SOL-GEL PROCESS
SPRAY DRYING
THERMOELECTRIC PROPERTIES
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DRYING
ELECTRICAL PROPERTIES
FABRICATION
MATERIALS WORKING
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
TRANSITION ELEMENT COMPOUNDS