Neutron and resonant x-ray diffraction studies of zirconolite 2M

dc.contributor.authorWhittle, KRen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorSmith, KLen_AU
dc.contributor.authorHyatt, NCen_AU
dc.descriptionThis paper is only available in print format. The Conference Proceedings are held by ANSTO Library, DDC number 543.1/11.en_AU
dc.description.abstractZirconolite (nominally CaZrTi2O7) is a constituent phase of potential waste forms for the safe immobilisation of actinide wastes. Structural studies of such materials provide important information about cation ordering, lattice parameters, and strain effects, and provide input into the modeling of alpha decay damage and the development of future wasteform designs. A suite of zirconolites based on the replacement of Ti with Nb and Fe has been studies using high resolution neutron diffraction and resonant x-ray diffraction to determine the degree of disorder across the available cation sites. Resonant x-ray diffraction is a unique method which allows the location of certain cations to be to be determined accurately by taking advantage of the change in scattering power close to an absorption edge (e.g.,, Nb-K and Zr-K). Using standard x-ray diffraction alone this is not possible and there is little scattering difference between Nb and Zr. Previous results on these materials have shown that the majority of the CaZrTi2-2xNbxFexO7 solid-solution series adopt the 2M polytype structure. Raman spectroscopy and measured lattice parameters have shown that the exchange of Ti with Nb+Fe has a non-linear effect on the unit cell dimensions while retaining the 2M polytype. Mössbauer spectroscopy has shown that the Fe preferentially fills the Ti split (Ti2) site. The new results provide a more complete picture of the cation order-disorder problem and are generally consistent with the behaviour of lattice parameters across the series. © 2009 AINSEen_AU
dc.identifier.citationWhittle, K. R, Lumpkin, G. R., Smith, K. L., & Hyatt, N. C. (2009). Neutron and resonant x-ray diffraction studies of zirconolite 2M. Paper presented at the 16th Conference on Nuclear & Complementary Techniques of Analysis, AINSE, Lucas Heights, 25-27 November 2009.en_AU
dc.identifier.conferenceenddate27 November 2009en_AU
dc.identifier.conferencename16th Conference on Nuclear & Complementary Techniques of Analysisen_AU
dc.identifier.conferenceplaceLucas Heights, NSWen_AU
dc.identifier.conferencestartdate25 November 2009en_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.subjectNeutron diffractionen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectWaste formsen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectCrystal latticesen_AU
dc.subjectAlpha decayen_AU
dc.titleNeutron and resonant x-ray diffraction studies of zirconolite 2Men_AU
dc.typeConference Abstracten_AU
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