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SUMMARY:Structural incorporation of Cm3+ and Pu3+ in phosphate ceramics wi
 th monazite structure.
DTSTART;VALUE=DATE-TIME:20171101T003000Z
DTEND;VALUE=DATE-TIME:20171101T004500Z
DTSTAMP;VALUE=DATE-TIME:20260720T214029Z
UID:indico-contribution-1162@events01.synchrotron.org.au
DESCRIPTION:Speakers: Stefan Neumeier (Forschungszentrum Jülich GmbH\, In
 stitute of Energy and Climate Research - IEK-6: Nuclear Waste Management a
 nd Reactor Safety\, 52425 Jülich\, Germany)\nPhosphate ceramics with mona
 zite structure are considered as potential waste forms for the conditionin
 g of specific nuclear waste streams (e.g. minor actinides and plutonium) d
 ue to their outstanding properties. In this study\, the incorporation of a
 ctinides (Cm3+ and Pu3+) into the monazite structure has been investigated
  combining X-ray diffraction (XRD) as well as X-ray absorption- (XAS) and 
 time-resolved laser fluorescence spectroscopy (TRLFS). \nThe results demon
 strate the incorporation of the actinides on defined lanthanide lattice si
 tes in the monazite ceramics. From TRLFS measurements of Cm-doped (50 ppm)
  (La\,Gd)PO4 solid solutions\, a decrease of short-range order for the sol
 id solution compositions was observed in comparison to the end-members. Ad
 ditionally\, XAS investigations on pure-phase La1-xPuxPO4 (x = 0.01 – 0.
 15) solid solutions verify the incorporation of plutonium in the +III oxid
 ation state in the monazites. The results provide a refined structural ins
 ight into mechanisms of actinide incorporation into monazite ceramics and 
 solid solution formation.\n\nhttps://events01.synchrotron.org.au/event/51/
 contributions/1162/
LOCATION:
URL:https://events01.synchrotron.org.au/event/51/contributions/1162/
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