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A modular model of the crystal structure of the pyrochlore-murataite polysomatic series

  • Crystal Chemistry
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Abstract

This paper reports on the results of a structural investigation of an important group of synthetic compounds with derivative structures of the mineral murataite, a potential matrix for immobilization of radioactive wastes. A model describing the structure of the entire group of compounds is proposed on the basis of analyzing the results obtained using chemical (electron microprobe) analysis methods, high-resolution transmission electron microscopy (high-resolution electron images and microdiffraction patterns), and X-ray diffractometry of a large array of artificial murataite ceramics. In essence, the proposed structural model is as follows: in the structure, layers of two (pyrochlore and murataite) packing types alternate along the [111] direction of the cubic supercell, so that the resulting structures can undergo substitutional and displacive modulations. Experiments on irradiation of different murataite modifications with heavy ions demonstrate that these modifications have close values of the radiation resistance, which is higher than that of the pyrochlore coexisting with them.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Leninskie gory, Moscow, 119992, Russia

    V. S. Urusov

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyĭ per. 35, Moscow, 119017, Russia

    N. I. Organova, O. V. Karimova & S. V. Yudintsev

  3. Department of Geological Sciences, University of Michigan, Ann Arbor, MI, 48109, USA

    R. C. Ewing

Authors
  1. V. S. Urusov
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  2. N. I. Organova
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  3. O. V. Karimova
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  4. S. V. Yudintsev
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  5. R. C. Ewing
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Dedicated to the 50th Anniversary of the Journal

Original Russian Text © V.S. Urusov, N.I. Organova, O.V. Karimova, S.V. Yudintsev, R.C. Ewing, 2007, published in Kristallografiya, 2007, Vol. 52, No. 1, pp. 41–49.

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Urusov, V.S., Organova, N.I., Karimova, O.V. et al. A modular model of the crystal structure of the pyrochlore-murataite polysomatic series. Crystallogr. Rep. 52, 37–46 (2007). https://doi.org/10.1134/S1063774507010051

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  • DOI: https://doi.org/10.1134/S1063774507010051

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