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 3
Unrolled X-ray diffraction images collected at room temperature (λ = 0.411 Å). (a) Sharp and intense reflections of (Mg_2.53Fe_0.47)C₃O₉ appear after laser-heating of the starting material at 98 GPa and 2500 K. (b) The crystal phase gradually deteriorates during decompression and (c) nearly disappears at ∼74 GPa. (d) Consequent laser-heating treatment results in the formation of the initial carbonate structure. Green circles mark a few of the characteristic reflections of (Mg_2.53Fe_0.47)C₃O₉, the position of Ne reflections and in some cases Re reflections are marked with blue and orange arrows, respectively. The 2θ positions of three characteristic carbonate (R $[\overline{3}]$ c) reflections are indicated with white arrows. Diamond reflections are marked in red.

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

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

https://doi.org/10.1107/S2056989020005411

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