Materials Data on Na(CoO2)3 by Materials Project

Na(CoO2)3 is Ilmenite-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.16–2.50 Å. There are three inequivalent Co+3.67+ sites. In the first Co+3.67+ site, Co+3.67+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 29–50°. There are a spread of Co–O bond distances ranging from 1.81–1.98 Å. In the second Co+3.67+ site, Co+3.67+ is bonded to six O2- atoms to form a mixture of distorted face and corner-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 29–58°. There are a spread of Co–O bond distances ranging from 1.88–2.21 Å. In the third Co+3.67+ site, Co+3.67+ is bonded to six O2- atoms to form a mixture of face, edge, and corner-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 53–58°. There are a spread of Co–O bond distances ranging from 1.83–1.99 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+ and three Co+3.67+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+ and three Co+3.67+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+ and three Co+3.67+ atoms. In the fourth O2- site, O2- is bonded in a distorted see-saw-like geometry to one Na1+ and three Co+3.67+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+ and three Co+3.67+ atoms. In the sixth O2- site, O2- is bonded in a distorted see-saw-like geometry to one Na1+ and three Co+3.67+ atoms.