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Type: Artigo de periódico
Title: Formation Kinetics Of Polycrystalline Eu2-xce Xcuo4-y Obtained From A Sol-gel Precursor
Author: Suzuki P.A.
Jardim R.F.
Gama S.
Abstract: Polycrystalline samples of Eu2-xCexCuO4-y (0.0≤x≤0.18) were prepared from a sol-gel precursor and sintered in air at different temperatures. From the x-ray diffraction results, the beginning of Eu2-xCexCuO4-y phase formation is observed by increasing the sintering temperature up to 500°C, as indicated by the presence of very broad Bragg reflections belonging to the desired phase. At 700°C, Eu2-xCexCuO4-y coexists with Eu 2O3, CeO2, and CuO. Additional sintering at 950°C in air for 20 h results in single phase materials. The effectiveness of Eu replacement by Ce in the Eu2CuO4 pristine phase has been confirmed by a decrease in the lattice parameter c with increasing x. Also, the solubility limit of Ce in these series was found to be higher than x=0.15. The results of thermal analysis reveal that the eutectic temperature T e≊1020°C is Ce independent. On the other hand, the peritectic temperature Tp increases significantly with increasing Ce concentration. It is close to Tp≊1180°C for Eu 2CuO4 and Tp≊1195°C for Eu 1.82Ce0.18CuO4-y. Thermogravimetric analysis performed during the heating process in all samples studied revealed a weight loss of ≊1.5% at the peritectic temperature. This weight loss has been attributed to an oxygen removal which is partially recovered during the cooling process.
Rights: aberto
Identifier DOI: 10.1063/1.358201
Date Issue: 1994
Appears in Collections:Unicamp - Artigos e Outros Documentos

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