Title: Actinide Incorporation in a Zirconia Based Pyrochlore(Nd1.8An0.2)Zr2O7+x (An ¼ Th, U,Np,Pu,Am)
Authors: NAESTREN CatharinaJARDIN R.SOMERS JosephWALTER MarcusBRENDEBACH B.
Citation: JOURNAL OF SOLID STATE CHEMISTRY vol. 182 p. 1-7
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Year: 2009
JRC N°: JRC50431
ISSN: 0022-4596
URI: http://www.elsevier.com/locate/jssc
http://publications.jrc.ec.europa.eu/repository/handle/JRC50431
DOI: 10.1016/j.jssc.2008.09.017
Type: Articles in Journals
Abstract: 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.
JRC Institute:Institute for Transuranium Elements

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