Spectroscopic investigations of neptunium`s and plutonium`s oxidation states in sol-gel glasses as a function of initial valance and thermal history

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Several oxidation states of neptunium and plutonium, Pu(III),Pu (IV), PU(VI), Np(IV), Np(V) and Np (VI), were studied in glasses prepared by a sol-gel technology. The oxidation state of these actinides was determined primarily by absorption spectrometry and followed as a function of the solidification process, subsequent aging and thermal treatments. It was determined that the initial oxidation state of the actinides in the starting solutions was essentially maintained through the solidification process to form the glasses. However, during densification and removal of residual solvents at elevated temperatures, both actinides in the different sol-gel products converted completely to their tetravalent states. ... continued below

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11 p.

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Stump, N.A.; Haire, R.G. & Dai, S. December 1, 1996.

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  • Stump, N.A. Winston-Salem State Univ., NC (United States). Dept. of Physical Sciences
  • Haire, R.G.
  • Dai, S. Oak Ridge National Lab., TN (United States)

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Several oxidation states of neptunium and plutonium, Pu(III),Pu (IV), PU(VI), Np(IV), Np(V) and Np (VI), were studied in glasses prepared by a sol-gel technology. The oxidation state of these actinides was determined primarily by absorption spectrometry and followed as a function of the solidification process, subsequent aging and thermal treatments. It was determined that the initial oxidation state of the actinides in the starting solutions was essentially maintained through the solidification process to form the glasses. However, during densification and removal of residual solvents at elevated temperatures, both actinides in the different sol-gel products converted completely to their tetravalent states. These results are discussed in terms of our findings in comparable studies that only the tetravalent states of plutonium and neptunium are formed in glasses prepared by dissolving their dioxides in different molten- glass formulations.

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11 p.

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INIS; OSTI as DE97000619

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97000619
  • Report No.: CONF-961202--4
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 421888
  • Archival Resource Key: ark:/67531/metadc686847

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  • December 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 25, 2016, 12:41 p.m.

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Stump, N.A.; Haire, R.G. & Dai, S. Spectroscopic investigations of neptunium`s and plutonium`s oxidation states in sol-gel glasses as a function of initial valance and thermal history, article, December 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc686847/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.