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NaCo3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Na is bonded in a 12-coordinate geometry to twelve equivalent Co atoms. There are six shorter (2.91 Å) and six longer (3.03 Å) Na–Co bond lengths. Co is bonded in a 10-coordinate geometry to four equivalent Na and six equivalent Co atoms. There are two shorter (2.37 Å) and four longer (2.43 Å) Co–Co bond lengths.
LiNaCO3 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional and consists of two medicinal charcoal molecules; one NaCO3 ribbon oriented in the (0, 0, 1) direction; and one Na2Li3O6 framework. In the NaCO3 ribbon, Na1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All Na–O bond lengths are 2.65 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.30 Å. O2- is bonded in a single-bond geometry to two equivalent Na1+ and one C4+ atom. In the Na2Li3O6 framework, there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All Na–O bond lengths are 2.48 Å. In the second Na1+ site, Na1+ is bonded in a hexagonal planar geometry to six O2- atoms. There are three shorter (2.12 Å) and three longer (2.13 Å) Na–O bond lengths. Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 2.31 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted square co-planar geometry to two Na1+ and two equivalent Li1+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one Na1+ atom.