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    Phase Decomposition upon Alteration of Radiation-Damaged Monazite-(Ce) from Moss, Ostfold, Norway

    154034_154034.pdf (1.183Mb)
    Access Status
    Open access
    Authors
    Nasdala, L.
    Ruschel, K.
    Rhede, D.
    Wirth, R.
    Kerschhofer-Wallner, L.
    Kennedy, Allen
    Kinny, Peter
    Finger, F.
    Groschopf, N.
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Nasdala, Lutz and Ruschel, Katja and Rhede, Dieter and Wirth, Richard and Kerschhofer-Wallner, Ljuba and Kennedy, Allen K. and Kinny, Peter D. and Finger, Friedrich and Groschopf, Nora. 2010. Phase Decomposition upon Alteration of Radiation-Damaged Monazite-(Ce) from Moss, Ostfold, Norway. CHIMIA. 64 (10): pp. 705-711.
    Source Title
    Chimia
    DOI
    10.2533/chimia.2010.705
    ISSN
    00094293
    School
    Department of Imaging and Applied Physics
    Remarks

    Copyright © 2010 CHIMIA, International Journal for Chemistry an Official Membership Journal of the Swiss Chemical Society (SCS) and its Division. This article was published in CHIMIA, 64, 10, October 2010, http://dx.doi.org/10.2533/chimia.2010.705

    See Related Link field for a link to the journal homepage

    URI
    http://hdl.handle.net/20.500.11937/17162
    Collection
    • Curtin Research Publications
    Abstract

    The internal textures of crystals of moderately radiation-damaged monazite-(Ce) from Moss, Norway, indicate heavy, secondary chemical alteration. In fact, the cm-sized specimens are no longer mono-mineral monazite but rather a composite consisting of monazite-(Ce) and apatite pervaded by several generations of fractures filled with sulphides and a phase rich in Th, Y, and Si. This composite is virtually a 'pseudomorph' after primary euhedral monazite crystals whose faces are still well preserved. The chemical alteration has resulted in major reworking and decomposition of the primary crystals, with potentially uncontrolled elemental changes, including extensive release of Th from the primary monazite and local redeposition of radionuclides in fracture fillings. This seems to question the general alteration-resistance of orthophosphate phases in a low-temperature, 'wet' environment, and hence their suitability as potential host ceramics for the long-term immobilisation of radioactive waste.

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