Effects of La content in ceria-lanthana thin films prepared by pulsed laser deposition
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2023
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BRAZIL MRS MEETING, 21st
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Solid oxide electrochemical reactors are a promising alternative for challenging chemical
reactions, such as oxidative coupling of methane (OCM)[1], which convert methane to
C2+products. Cerium oxide is a commonly studied oxide membrane material for its high ionic
conductivity in the temperature range ideal for conversion reactions (600-900°C),
particularly when doped with rare earth cations like Gd, Sm, or La. Recent studies have
shown La2Ce2O7as a promising OCM catalyst[2]. This study investigates the structural
properties of LaxCe(1-x)O2(1-x/2)thin films, prepared using pulsed laser deposition, with varying
stoichiometry. XRD results indicate textured film growth with preferential [100] orientation
of cubic crystalline fluorite for low La content (x≤0.5), while x>0.5 had a random
orientation. La doping expanded the fluorite structure, increasing lattice parameters from
5.42 Å for x=0 to 5.69 Å for x=0.7. UV-Raman spectroscopy showed that La content x=10
caused a more pronounced balance between Ce4+and Ce3+than pure ceria samples.
Impedance revealed a direct relationship between La content and resistance, indicating lower
resistance with lower La content. These findings could lead to using Ce-La oxides thin films as
catalysts for OCM in electrochemical reactors based on ceria.
Como referenciar
OLIVEIRA, RAPHAEL A.M.P. de; TRINDADE, FABIANE J.; FLORIO, DANIEL Z. de; FONSECA, FABIO C.; ESPOSITO, VINCENZO; FERLAUTO, ANDRE S. Effects of La content in ceria-lanthana thin films prepared by pulsed laser deposition. In: BRAZIL MRS MEETING, 21st, October 1-5, 2023, Maceió, AL. Abstract... São Carlos, SP: Aptor Software, 2023. p. 810-810. Disponível em: http://repositorio.ipen.br/handle/123456789/34550. Acesso em: 30 Dec 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.