Influence of the synthesis method on the porosity, microstructure and electrical properties of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} cathode materials

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.06.017· OSTI ID:22066149

Conceicao, Leandro da; Silva, Camila R.B. ^[1]; Ribeiro, Nielson F.P. ^[2]

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1. Escola de Quimica - UFRJ, Centro de Tecnologia, Bloco E, sala 206, CEP 21941-909, Rio de Janeiro/RJ (Brazil)
2. NUCAT/PEQ/COPPE - UFRJ, Centro de Tecnologia, Bloco G, sala 128, CEP 21945-970, Rio de Janeiro/RJ (Brazil)

Lanthanum strontium manganite (La{sub 1-x}Sr{sub x}MnO{sub 3}, LSM) has been studied as a promising material for application as a cathode in solid oxide fuel cells. In the present work La{sub 0.7}Sr{sub 0.3}MnO{sub 3} nanopowders were synthesized by three different methods (combustion, citrate and solid-state) and characterized by thermal analysis, X-ray diffraction, physical adsorption of N{sub 2} and scanning electron microscopy. All powders exhibited single LSM phase formation with crystallite sizes in the range of 12-20 nm. Nanopowders were sintered at 1100 deg. C to produce porous pellets. The porosity, particle size and microstructure of LSM sintered bodies are strongly dependent on the preparation methodology. The samples synthesized by combustion and citrate methods presented smaller particle sizes and higher porosity after sintering than that derived from solid-state synthesis. However, the electrical conductivity, measured by two-probe technique, was very similar for all three samples.

• OSTI ID: 22066149
• Journal Information: Materials Characterization, Vol. 60, Issue 12; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ADSORPTION
CATHODES
CITRATES
COMBUSTION
ELECTRIC CONDUCTIVITY
LANTHANUM COMPOUNDS
MANGANATES
MICROSTRUCTURE
NANOSTRUCTURES
PARTICLE SIZE
POROSITY
POROUS MATERIALS
POWDERS
SCANNING ELECTRON MICROSCOPY
SINTERING
SOLID OXIDE FUEL CELLS
STRONTIUM COMPOUNDS
SYNTHESIS
THERMAL ANALYSIS
X-RAY DIFFRACTION