Crystal Structures of High-Pressure Carbonates (IMAGE)

European Synchrotron Radiation Facility

Crystal Structures of High-Pressure Carbonates

Caption

(a) Tetrairon (III) orthocarbonate Fe4C3O12 and (b) diiron (II) diiron (III) tetracarbonate Fe4C4O13, at ambient temperature and 74(1) and 97(2) GPa, respectively. In (a), three FeO8 bicapped prisms (light green) and three CO4-tetrahedra (brown) form a ring with 3-fold symmetry by corner and edge sharing. The rings form layers that are stacked along the c-axis. FeO6-prisms (dark green) are connected by triangular bases and located in the channels created by the rings. In (b), FeO8 bi-capped prisms (blue) are connected in a 3-D framework by dimers of edge-shared FeO7 monocapped prisms (light green) and zigzag-shaped C4O1310- chains (brown).

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Valerio Cerantola

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