Low temperature synthesis of gadolinium-doped cerium oxide nanoparticles
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2016
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BRAZILIAN MRS MEETING, 15th
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In this study, a green chemistry route for the synthesis of gadolinium-doped ceria
(GDC) nanoparticles is reported. The aqueous based reflux method uses nitrates
of both ceria and gadolinium and hexamethylenetetramine as starting materials to
produce GDC at 80 ºC. As-produced powders were found to be crystalline fluoritetype
structure GDC before any heat treatment, with crystallite size ≤ 10 nm, as
inferred by X-rays diffraction analyses. Energy dispersive X-ray spectroscopy data
revealed that GDC powders, with gadolinium concentration in the 0 - 20 mol%
range, have composition close to the nominal values, within the experimental
error. Thermogravimetric analyses (TG) evidenced that main mass loss (~7%)
occurs at < 400 °C. Sintering behavior was studied by dilatometry of cylindrical
pellets pressed using both as-produced and calcined (400 °C for 1 hour in air)
powders. The retraction profile of the as-produced samples resembles the TG
data, showing plateaus that correspond to the observed mass loss events. On the
other hand, sintering of calcined samples exhibited onset of shrinkage at T ~ 600
°C and a continuous retraction up to 1400°C (~17% total retraction). The
experimental results indicate that the synthesis method results in GDC with good
properties for application in electrochemical devices, such as fuel cells and solardriven
thermochemical reactors.
Como referenciar
MORAES, LETICIA P.R. de; MONTEIRO, NATALIA K.; MACHADO, MARINA F. de; ESPOSITO, VINCENZO; FLORIO, DANIEL Z. de; MARANI, DEBORA; FONSECA, FABIO C. Low temperature synthesis of gadolinium-doped cerium oxide nanoparticles. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27425. Acesso em: 09 May 2024.
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.