The crystal structures of Fe-bearing MgCO3 sp2- and sp3-carbonates at 98 GPa from single-crystal X-ray diffraction using synchrotron radiation

Chariton, S.; Bykov, M.; Bykova, E.; Koemets, E.; Fedotenko, T.; Winkler, B.; Hanfland, M.; Prakapenka, V.B.; Greenberg, E.; McCammon, C.; Dubrovinsky, L.

doi:10.1107/S2056989020005411

Acta Crystallographica Section E
Acta Crystallographica
Section E CRYSTALLOGRAPHIC COMMUNICATIONS

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Figure 2
(a) The crystal structure of (Mg_2.53Fe_0.47)C₃O₉ according to this study, in a projection along the c axis; CO₄ tetrahedra are given in the polyhedral representation. (b) The three cation sites that host Mg/Fe atoms and their respective polyhedra. (c) C₃O₉⁶⁻ ring anions are formed from three edge-sharing CO₄ tetrahedra. Atomic positions are shaded according to colours in (b) and oxygen atoms appear as small white spheres. [Symmetry codes: (i) x, −y, z; (v) −x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , −z + 1; (x) −x, y, −z + 1; (xi) x, y, z + 1.]

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 76| Part 5| May 2020| Pages 715-719

https://doi.org/10.1107/S2056989020005411

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