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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na3(CoO2)4 by Materials Project

Na3(CoO2)4 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 pentagonal pyramids that share corners with six CoO6 octahedra, edges with six CoO6 octahedra, and edges with six equivalent NaO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 9–13°. There are a spread of Na–O bond distances ranging from 2.38–2.40 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.48 Å. There are two inequivalent Co+3.25+ sites. In the first Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with three equivalent NaO6 pentagonal pyramids, edges with six CoO6 octahedra, and edges with three equivalent NaO6 pentagonal pyramids. There are a spread of Co–O bond distances ranging from 1.95–2.10 Å. In the second Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with three equivalent NaO6 pentagonal pyramids, edges with six CoO6 octahedra, and edges with three equivalent NaO6 pentagonal pyramids. There are a spread of Co–O bond distances ranging from 1.96–2.09 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Na1+ and three Co+3.25+ atoms to form ONa3Co3 octahedra that share corners with six ONa3Co3 octahedra, corners with three equivalent ONa2Co3 square pyramids, edges with six ONa3Co3 octahedra, an edgeedge with one ONa2Co3 square pyramid, and a faceface with one ONa3Co3 octahedra. The corner-sharing octahedra tilt angles range from 40–43°. In the second O2- site, O2- is bonded to three equivalent Na1+ and three Co+3.25+ atoms to form ONa3Co3 octahedra that share corners with six ONa3Co3 octahedra, edges with six ONa3Co3 octahedra, edges with two equivalent ONa2Co3 square pyramids, and a faceface with one ONa3Co3 octahedra. The corner-sharing octahedra tilt angles range from 40–44°. In the third O2- site, O2- is bonded in a distorted see-saw-like geometry to one Na1+ and three Co+3.25+ atoms. In the fourth O2- site, O2- is bonded to two equivalent Na1+ and three Co+3.25+ atoms to form ONa2Co3 square pyramids that share corners with three equivalent ONa3Co3 octahedra, corners with two equivalent ONa2Co3 square pyramids, edges with three ONa3Co3 octahedra, and edges with three equivalent ONa2Co3 square pyramids. The corner-sharing octahedra tilt angles range from 1–4°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3(CoO2)4 by Materials Project

Na3(CoO2)4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.21–2.52 Å. In the second Na1+ site, Na1+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.82 Å. There are three inequivalent Co+3.25+ sites. In the first Co+3.25+ site, Co+3.25+ is bonded to five O2- atoms to form edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.87–1.95 Å. In the second Co+3.25+ site, Co+3.25+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.83 Å) and two longer (1.96 Å) Co–O bond length. In the third Co+3.25+ site, Co+3.25+ is bonded in a distorted square co-planar geometry to four O2- atoms. There is two shorter (1.83 Å) and two longer (1.98 Å) Co–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Na1+ and two Co+3.25+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+ and two equivalent Co+3.25+ atoms. In the third O2- site, O2- is bonded in a 5-coordinate geometry to two Na1+ and three Co+3.25+ atoms. In the fourth O2- site, O2- is bonded to three Na1+ and two Co+3.25+ atoms to form a mixture of distorted corner and edge-sharing ONa3Co2 square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3(CoO2)4 by Materials Project

Na3(CoO2)4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.29–2.52 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are four shorter (2.37 Å) and two longer (2.40 Å) Na–O bond lengths. There are three inequivalent Co+3.25+ sites. In the first Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.90–2.03 Å. In the second Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.96–2.01 Å. In the third Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.95–2.04 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Na1+ and three Co+3.25+ atoms to form ONa2Co3 square pyramids that share corners with three equivalent ONa3Co3 octahedra, corners with six ONa2Co3 square pyramids, edges with three equivalent ONa3Co3 octahedra, and edges with five ONa2Co3 square pyramids. The corner-sharing octahedra tilt angles range from 1–2°. In the second O2- site, O2- is bonded to two Na1+ and three Co+3.25+ atoms to form ONa2Co3 square pyramids that share corners with nine ONa2Co3 square pyramids, edges with four equivalent ONa3Co3 octahedra, and edges with four ONa2Co3 square pyramids. In the third O2- site, O2- is bonded to three Na1+ and three Co+3.25+ atoms to form distorted ONa3Co3 octahedra that share corners with three equivalent ONa3Co3 octahedra, corners with three equivalent ONa2Co3 square pyramids, an edgeedge with one ONa3Co3 octahedra, and edges with eleven ONa2Co3 square pyramids. The corner-sharing octahedral tilt angles are 0°. In the fourth O2- site, O2- is bonded to two Na1+ and three Co+3.25+ atoms to form ONa2Co3 square pyramids that share corners with nine ONa2Co3 square pyramids, edges with four equivalent ONa3Co3 octahedra, and edges with four ONa2Co3 square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3(CoO2)4 by Materials Project

Na3(CoO2)4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with six equivalent CoO6 octahedra, edges with four NaO6 octahedra, and edges with six CoO6 octahedra. The corner-sharing octahedra tilt angles range from 11–17°. There are a spread of Na–O bond distances ranging from 2.38–2.42 Å. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with six equivalent CoO6 octahedra, edges with four equivalent NaO6 octahedra, and edges with six CoO6 octahedra. The corner-sharing octahedra tilt angles range from 11–15°. There are two shorter (2.36 Å) and four longer (2.41 Å) Na–O bond lengths. There are three inequivalent Co+3.25+ sites. In the first Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent NaO6 octahedra, edges with four NaO6 octahedra, and edges with six CoO6 octahedra. The corner-sharing octahedra tilt angles range from 11–17°. There are a spread of Co–O bond distances ranging from 1.99–2.08 Å. In the second Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent NaO6 octahedra, edges with four equivalent NaO6 octahedra, and edges with six CoO6 octahedra. The corner-sharing octahedra tilt angles range from 11–15°. There are two shorter (2.03 Å) and four longer (2.04 Å) Co–O bond lengths. In the third Co+3.25+ site, Co+3.25+ is bonded to six O2- atoms to form CoO6 octahedra that share edges with six NaO6 octahedra and edges with six CoO6 octahedra. There is two shorter (1.87 Å) and four longer (2.00 Å) Co–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three Na1+ and three Co+3.25+ atoms to form ONa3Co3 octahedra that share corners with six equivalent ONa3Co3 octahedra and edges with twelve ONa2Co3 square pyramids. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded to two Na1+ and three Co+3.25+ atoms to form ONa2Co3 square pyramids that share corners with nine ONa2Co3 square pyramids, edges with four equivalent ONa3Co3 octahedra, and edges with four ONa2Co3 square pyramids. In the third O2- site, O2- is bonded to two equivalent Na1+ and three Co+3.25+ atoms to form distorted ONa2Co3 square pyramids that share corners with nine ONa2Co3 square pyramids, edges with four equivalent ONa3Co3 octahedra, and edges with four equivalent ONa2Co3 square pyramids.

36 MATERIALS SCIENCE↗