Zirconolite-a fluorite-related superstructure

Synthetic zirconolite, CaZrTi 2 O 7 , has attracted interest recently, as it has been proposed as a constituent phase of an artificial rock (SYNROC) which may immobilise, in solid solution, the elements occurring in high-level nuclear reactor wastes1. Although it is known that zirconolite is a super...

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Bibliographic Details
Published in:Nature (London) 1980-01, Vol.283 (5744), p.282-283
Main Author: Rossell, H. J
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
Science (multidisciplinary)
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Summary:Synthetic zirconolite, CaZrTi 2 O 7 , has attracted interest recently, as it has been proposed as a constituent phase of an artificial rock (SYNROC) which may immobilise, in solid solution, the elements occurring in high-level nuclear reactor wastes1. Although it is known that zirconolite is a superstructure phase, derived by ordering of an anion-deficient fluorite (CaF 2 − x or Mo 2 − x ) type of substructure 2 , the crystal structure proper, and thus the nature of the ordering, is not known. This has hampered discussion of the crystal chemistry of the phase. A crystal structure determined from powder X-ray diffraction intensities and adequate for such discussion purposes is reported here.
ISSN:0028-0836
1476-4687
DOI:10.1038/283282a0