MORAES, LETICIA P.R. deMONTEIRO, NATALIA K.MACHADO, MARINA F. deESPOSITO, VINCENZOFLORIO, DANIEL Z. deMARANI, DEBORAFONSECA, FABIO C.2017-05-102017-05-10MORAES, 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. <b>Abstract...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/27425.http://repositorio.ipen.br/handle/123456789/27425In 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.openAccesscerium oxidescrystal structuredoped materialsgadoliniumnanoparticlessinteringsynthesistemperature range 0065-0273 kthermal gravimetric analysisurotropinx-ray diffractionx-ray spectroscopyResumo de eventos científicoshttps://orcid.org/0000-0003-0708-2021