Preparation and characterization of dicesium tetravalent plutonium hexanitrate

Masaumi Nakahara, Kazunori Nomura, Tadahiro Washiya, Takahiro Chikazawa, Izumi Hirasawa

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    In experiments on U crystallization in a dissolver solution containing Cs, there is concern that Cs and Pu(IV) nitrate complex are deposited on the UNH crystal in the dissolver solution at the time of the U crystallization. The characteristics of generation of Cs and Pu(IV) nitrate complex with dissolver solution of MOX fuel were examined. This complex was obtained as a precipitate by mixing dissolver solution of MOX fuel and CsNO3 solution, and was identified as dicesium tetravalent plutonium hexanitrate, Cs2Pu(NO3)6 by concentration analysis and XRD. The precipitate has a tendency to be generated at high HNO3 concentrations. Thermal analysis shows that the precipitate is stable below 245 °C, and a weight loss of 10.29 ± 0.23% is observed between 245 and 297 °C. This result indicates the decomposition of Cs2Pu(NO3)6 to Cs2PuO2(NO3)4. With these properties, the UNH crystal should melt at the condition between 60 and 100 °C and be separable from the Cs complex by filtration. This suggests a new method of crystal purification allowing higher decontamination of UNH crystal in the U crystallization process.

    Original languageEnglish
    Pages (from-to)659-662
    Number of pages4
    JournalJournal of Alloys and Compounds
    Volume489
    Issue number2
    DOIs
    Publication statusPublished - 2010 Jan 21

    Fingerprint

    Plutonium
    Crystallization
    Precipitates
    Crystals
    Nitrates
    Decontamination
    Thermoanalysis
    Purification
    Decomposition
    Experiments

    Keywords

    • Actinide alloys and compounds
    • Precipitation
    • Thermal analysis
    • X-ray diffraction

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Mechanics of Materials
    • Materials Chemistry
    • Metals and Alloys

    Cite this

    Preparation and characterization of dicesium tetravalent plutonium hexanitrate. / Nakahara, Masaumi; Nomura, Kazunori; Washiya, Tadahiro; Chikazawa, Takahiro; Hirasawa, Izumi.

    In: Journal of Alloys and Compounds, Vol. 489, No. 2, 21.01.2010, p. 659-662.

    Research output: Contribution to journalArticle

    Nakahara, Masaumi ; Nomura, Kazunori ; Washiya, Tadahiro ; Chikazawa, Takahiro ; Hirasawa, Izumi. / Preparation and characterization of dicesium tetravalent plutonium hexanitrate. In: Journal of Alloys and Compounds. 2010 ; Vol. 489, No. 2. pp. 659-662.
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    abstract = "In experiments on U crystallization in a dissolver solution containing Cs, there is concern that Cs and Pu(IV) nitrate complex are deposited on the UNH crystal in the dissolver solution at the time of the U crystallization. The characteristics of generation of Cs and Pu(IV) nitrate complex with dissolver solution of MOX fuel were examined. This complex was obtained as a precipitate by mixing dissolver solution of MOX fuel and CsNO3 solution, and was identified as dicesium tetravalent plutonium hexanitrate, Cs2Pu(NO3)6 by concentration analysis and XRD. The precipitate has a tendency to be generated at high HNO3 concentrations. Thermal analysis shows that the precipitate is stable below 245 °C, and a weight loss of 10.29 ± 0.23{\%} is observed between 245 and 297 °C. This result indicates the decomposition of Cs2Pu(NO3)6 to Cs2PuO2(NO3)4. With these properties, the UNH crystal should melt at the condition between 60 and 100 °C and be separable from the Cs complex by filtration. This suggests a new method of crystal purification allowing higher decontamination of UNH crystal in the U crystallization process.",
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