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- W3209609092 abstract "• Re 4+ in Re(SnO 2 ) is easily oxidized to Re 7+ in air at temperature above 300 °C. • Re volatilized from Re(SnO 2 ) faster in air than in N 2 . • The incorporation of Re in the lattice of SnO 2 mineral could increase Re retention by ∼30% points during vitrification. Rhenium (Re), a non-radioactive surrogate for technetium (Tc), was incorporated into the lattice of SnO 2 by reductive co-precipitation process at room temperature, and Re volatility from Re(SnO 2 ) under different conditions (in air and N 2 and with glass frit) at elevated temperatures was carefully investigated. Re began to evaporate from Re(SnO 2 ) both in air and N 2 at 400 °C, while Re exhibited a faster volatilization in air than in N 2 , as all Re was gone at 1200 °C in air, but ∼40% of Re still remained at 1200 °C in N 2 . Additionally, Re did not volatilize from Re(SnO 2 )-containing glass frit until 800 °C and only ∼15% of Re volatilized at 1200 °C, suggesting the loss of Re decreased by ∼30% points through incorporation of Re into SnO 2 before vitrification. The analysis of Re valence transition revealed that the reduced Re 4+ was easily oxidized to volatile Re 7+ in air, but in N 2 , Re 4+ disproportionated to form Re 7+ and the lower valence states of Re at temperatures from 600 °C to 1000 °C. In Re(SnO 2 )-containing glass frit, the formation of NaReO 4 during vitrification inhibited Re 7+ volatilization before 800 °C, while the presence of Re 4+ in the glass melt enhanced Re retention at temperature above 800 °C." @default.
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- W3209609092 date "2022-01-01" @default.
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- W3209609092 title "Re volatilization at elevated temperatures: Interest of Re-doped SnO2 for nuclear waste vitrification" @default.
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- W3209609092 doi "https://doi.org/10.1016/j.jnucmat.2021.153372" @default.
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