Time-Resolved Infrared Reflectance Studies of the Dehydration-Induced Transformation of Uranyl Nitrate Hexahydrate to the Trihydrate Form

The Journal of Physical Chemistry. a
Timothy J JohnsonBruce K McNamara

Abstract

Uranyl nitrate is a key species in the nuclear fuel cycle. However, this species is known to exist in different states of hydration, including the hexahydrate ([UO2(NO3)2(H2O)6] often called UNH), the trihydrate [UO2(NO3)2(H2O)3 or UNT], and in very dry environments the dihydrate form [UO2(NO3)2(H2O)2]. Their relative stabilities depend on both water vapor pressure and temperature. In the 1950s and 1960s, the different phases were studied by infrared transmission spectroscopy but were limited both by instrumental resolution and by the ability to prepare the samples for transmission. We have revisited this problem using time-resolved reflectance spectroscopy, which requires no sample preparation and allows dynamic analysis while the sample is exposed to a flow of N2 gas. Samples of known hydration state were prepared and confirmed via X-ray diffraction patterns of known species. In reflectance mode the hexahydrate UO2(NO3)2(H2O)6 has a distinct uranyl asymmetric stretch band at 949.0 cm(-1) that shifts to shorter wavelengths and broadens as the sample desiccates and recrystallizes to the trihydrate, first as a shoulder growing in on the blue edge but ultimately results in a doublet band with reflectance peaks at 966 and 957 cm(-...Continue Reading

References

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Feb 14, 2008·Physical Chemistry Chemical Physics : PCCP·G S GroenewoldM J Van Stipdonk
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Citations

Aug 18, 2016·Inorganic Chemistry·Jonathan D Burns, Bruce A Moyer
Dec 29, 2017·Applied Spectroscopy·Toya N BeiswengerTimothy J Johnson
Jan 16, 2017·The Journal of Chemical Physics·M C KirkegaardA Miskowiec
Jun 18, 2021·The Journal of Physical Chemistry. a·Eric RenaultJohn K Gibson
Aug 17, 2021·Analytical Methods : Advancing Methods and Applications·Tanya L MyersTimothy J Johnson
May 15, 2019··Kristin DeWitt, Kristin DeWitt
May 15, 2019··Kristin DeWitt, Kristin DeWitt

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