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Publication Detail
Structural transformations and disordering in zirconolite (CaZrTi2O7) at high pressure
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Salamat A, McMillan PF, Firth S, Woodhead K, Hector AL, Garbarino G, Stennett MC, Hyatt NC
  • Publication date:
  • Pagination:
    1550, 1558
  • Journal:
    Inorganic Chemistry
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
There is interest in identifying novel materials for use in radioactive waste applications and studying their behavior under high pressure conditions. The mineral zirconolite (CaZrTi 2 O 7 ) exists naturally in trace amounts in diamond-bearing deep-seated metamorphic/igneous environments, and it is also identified as a potential ceramic phase for radionuclide sequestration. However, it has been shown to undergo radiation-induced metamictization resulting in amorphous forms. In this study we probed the high pressure structural properties of this pyrochlore-like structure to study its phase transformations and possible amorphization behavior. Combined synchrotron X-ray diffraction and Raman spectroscopy studies reveal a series of high pressure phase transformations. Starting from the ambient pressure monoclinic structure, an intermediate phase with P2 1 /m symmetry is produced above 15.6 GPa via a first order transformation resulting in a wide coexistence range. Upon compression to above 56 GPa a disordered metastable phase III with a cotunnite-related structure appears that is recoverable to ambient conditions. We examine the similarity between the zirconolite behavior and the structural evolution of analogous pyrochlore systems under pressure. © 2013 American Chemical Society.
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