Structural analysis of Co-doped lanthanum chromite by anomalous X-ray scattering
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2008
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REUNIAO ANUAL DE USUARIOS LNLS, 18.
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Lanthanum chromite (LaCrO3) is the most adequate material for use as interconnector in solid oxide fuel cell (SOFC) applications, due to its intrinsic properties,
namely, its good electrical conductivity and resistance to environment conditions in
fuel cell operations. LaCrO3 presents a perovskite-type structure. At a temperature
of approximately 260◦C it undergoes a crystallographic transformation, from orthorhombic (Pnma) to rhombohedral (R-3c) structure. In the present contribution
we report the results of the refinaments of the crystalline structures of cobaltdoped lanthanum chromite (LaCr1−xCoxO3, x = 0.10; 0.15; 0.20; 0.25; 0.30), performed by means of the Rietveld method. The powders of cobalt-doped lanthanum
chromite were obtained by combustion synthesis, using urea as fuel. The X-ray
diffraction patterns were obtained using synchrotron radiation of energy equal to
5.85 keV, near the chromium K edge and at room temperature. For the Co-doped
samples, except for x = 0.25 and 0.30, one observed a structure similar to the
non doped LaCrO3, namely, Pnma symmetry, with variations in the lattice parameters (a, b, c) and diminishing unit cell volumes. The samples with x = 0.25
and 0.30 presented both orthorhombic and rhombohedral structures, showing that
cobalt additions over 25% produces the stabilization of rhombohedral lanthanum
chromite at room temperature.
Como referenciar
CORREA, H.P.S.; SETZ, L.F.G.; MELLO CASTANHO, S.; MARTINEZ, L.G.; CAVALCANTE, I.P.; ORLANDO, M.T.D.; PAIVA SANTOS, C.O. Structural analysis of Co-doped lanthanum chromite by anomalous X-ray scattering. In: REUNIAO ANUAL DE USUARIOS LNLS, 18., 18-19 de fevereiro, 2008, Campinas, SP. Resumo... p. 118. Disponível em: http://repositorio.ipen.br/handle/123456789/22844. Acesso em: 27 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.