Actinide Incorporation in a Zirconia Based Pyrochlore(Nd1.8An0.2)Zr2O7+x (An ¼ Th, U,Np,Pu,Am)
Actinides (thorium,uranium,neptunium,plutonium,andamericium)wereinfiltratedintoaporous
Nd1.8Zr2O6.7 matrix, preparedbygel-supportedprecipitation.(Nd1.8An0.2)Zr2O7+x pyrochloreswere
formedaftersinteringinAr/H2 and thepyrochlorestructureremainsduringoxidationat800 1C inair.
X-raydiffractionrevealsalinearrelationshipbetweenthepyrochlorelatticeparameterandtheionic
radii oftheactinides.EXAFSmeasurementsonactinide L3-edge showasplitshellofnearestneighbour
oxygenatomssimilartothatsurroundingofNd.Theactinide¿oxygenbonddistancesdecreasewiththe
actinideionicradii,whichverifiesthattheseactinidesadopttheNdsiteinthe(Nd1.8An0.2)Zr2O7+x
pyrochlore.TheoxidationsusceptibilityofNpisrelatedtotheavailabilityofoxygenvacanciesandin
contrasttostabilisedzirconiaNp(V)canbeobtainedinzirconiabasedpyrochlore.
NAESTREN Catharina;
JARDIN R.;
SOMERS Joseph;
WALTER Marcus;
BRENDEBACH B.;
2009-02-12
ACADEMIC PRESS INC ELSEVIER SCIENCE
JRC50431
0022-4596,
www.elsevier.com/locate/jssc,
https://publications.jrc.ec.europa.eu/repository/handle/JRC50431,
10.1016/j.jssc.2008.09.017,
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