Modular nature of the polysomatic pyrochlore-murataite series

N. P. Laverov, V. S. Urusov, S. V. Krivovichev, A. S. Pakhomova, S. V. Stefanovsky, S. V. Yudintsev

Research output

8 Citations (Scopus)

Abstract

Synthetic analogues of murataite, a very rare mineral-a complex oxide of REE, actinide, Ti, Fe, and other elements,-are of great interest as confinement matrices of radioactive wastes. They are produced by sintering (1200-1300°C) and melting (1500-1600°C) with subsequent crystallization of the melt. Four structural varieties of murataite distinguished by unit-cell parameters have been established by TEM study. All these varieties are derivatives of the fluorite structure designated as murataite 3C, 5C, 7C, and 8C depending on repetition factor of a parameter of the fluorite subcell. The structural features of the synthetic murataite varieties are analyzed in this paper based on data obtained from high-resolution electron microscopy, microdiffraction, and X-ray refinement. The hypothesis of a modular structure of the members of polysomatic pyrochlore-murataite series has been confirmed. At the same time, the structural modules are zero-dimensional rather than two-dimensional as had previously been suggested. The combinations of zero-dimensional modules in 3D space create the entire structural diversity of the polysomatic series.

Original languageEnglish
Pages (from-to)273-294
Number of pages22
JournalGeology of Ore Deposits
Volume53
Issue number4
DOIs
Publication statusPublished - Aug 2011

Fingerprint

pyrochlore
Fluorspar
fluorite
Actinoid Series Elements
Radioactive Waste
actinide
High resolution electron microscopy
Crystallization
electron microscopy
radioactive waste
Oxides
Minerals
transmission electron microscopy
Melting
rare earth element
crystallization
Sintering
melting
melt
oxide

Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Economic Geology

Cite this

Laverov, N. P. ; Urusov, V. S. ; Krivovichev, S. V. ; Pakhomova, A. S. ; Stefanovsky, S. V. ; Yudintsev, S. V. / Modular nature of the polysomatic pyrochlore-murataite series. In: Geology of Ore Deposits. 2011 ; Vol. 53, No. 4. pp. 273-294.
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Modular nature of the polysomatic pyrochlore-murataite series. / Laverov, N. P.; Urusov, V. S.; Krivovichev, S. V.; Pakhomova, A. S.; Stefanovsky, S. V.; Yudintsev, S. V.

In: Geology of Ore Deposits, Vol. 53, No. 4, 08.2011, p. 273-294.

Research output

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AU - Laverov, N. P.

AU - Urusov, V. S.

AU - Krivovichev, S. V.

AU - Pakhomova, A. S.

AU - Stefanovsky, S. V.

AU - Yudintsev, S. V.

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