Research output: Contribution to journal › Article › peer-review
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 language | English |
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Pages (from-to) | 273-294 |
Number of pages | 22 |
Journal | Geology of Ore Deposits |
Volume | 53 |
Issue number | 4 |
DOIs | |
State | Published - Aug 2011 |
ID: 49250247