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Type: Artigo de periódico
Title: Mossbauer study and structural characterization of UO2-Gd2O3 sintered compounds
Author: Pagano, L
Valenca, GP
Silva, SL
Claudio, AEL
Ivashita, FF
Barco, R
de Medeiros, SN
Paesano, A
Abstract: Samples of UO2 and up to 10 wt% of Gd2O3 were prepared by solid-state reaction under a reducing atmosphere, in a thermal path comprising ramps and dwell times in the temperature range of 900-1750 degrees C. The sintered material was analyzed by X-ray diffraction and Gd-155 Mossbauer spectroscopy. The results showed that for samples annealed up to 900 degrees C, the gadolinium sesquioxide remained unreacted. However, when the temperature was increased to 1300 degrees C, a solid-state reaction took place forming mixed oxides. For the more severe sintering condition, at 1750 degrees C, gadolinia left urania partially unreacted producing a material consisting of two compositions, UO2 (with no dissolved gadolinium) and (U,Gd)O-2. The proposed heating cycle provided pellets free from Gd2O3 phase and may be used by the nuclear fuel industry as a suitable sintering process. (c) 2008 Elsevier B.V. All rights reserved.
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jnucmat.2008.03.024
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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