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All sourcesNASA NTRSDOE OSTI
NASA NTRS1993

Determination of the structure and bond energies of NiO2 and CuO2

On the basis of extensive ab initio calculations, we estimate the metal-O2 binding energies of NiO2 and CuO2 to be 48 +/- 7 and 18 +/- 4 kcal/mol, respectively. We feel that the experimental estimate of 57 +/- 10 kcal/mol for the binding energy of NiO2 is slightly too large, while we are in complete agreement with the experimental estimate of 15 +10/-5 kcal/mol for CuO2. While the 1A1 ground state of NiO2 definitely has a side-on C(2v) structure, matrix isolation studies suggest that CuO2 has an end-on C(s) structure. Calculations at the coupled-cluster singles plus doubles level with a perturbational estimate of triple excitations, CCSD(T), produce a 2A2 state with C(2v) as a global minimum. However, the entire 2A-double prime ground-state surface is exceedingly flat, precluding a reliable determination of the gas-phase equilibrium structure.

Bauschlicher, Charles W., Jr.↗
DOE OSTI2020

Materials Data on NiO2 by Materials Project

NiO2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two NiO2 ribbons oriented in the (1, 0, 0) direction. Ni4+ is bonded in a distorted square co-planar geometry to four equivalent O2- atoms. All Ni–O bond lengths are 1.86 Å. O2- is bonded in a distorted water-like geometry to two equivalent Ni4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(NiO2)4 by Materials Project

Ca(NiO2)4 is beta indium sulfide-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ca2+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Ca–O bond lengths are 2.36 Å. There are two inequivalent Ni+3.50+ sites. In the first Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form edge-sharing NiO6 octahedra. There is four shorter (1.89 Å) and two longer (1.91 Å) Ni–O bond length. In the second Ni+3.50+ site, Ni+3.50+ is bonded to six equivalent O2- atoms to form edge-sharing NiO6 octahedra. All Ni–O bond lengths are 2.03 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Ni+3.50+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three equivalent Ni+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(NiO2)4 by Materials Project

Sr(NiO2)4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Sr2+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Sr–O bond lengths are 2.52 Å. There are two inequivalent Ni+3.50+ sites. In the first Ni+3.50+ site, Ni+3.50+ is bonded to six equivalent O2- atoms to form edge-sharing NiO6 octahedra. All Ni–O bond lengths are 2.02 Å. In the second Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form edge-sharing NiO6 octahedra. There is four shorter (1.89 Å) and two longer (1.91 Å) Ni–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Sr2+ and three Ni+3.50+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three equivalent Ni+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(NiO2)4 by Materials Project

Ba(NiO2)4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ba2+ is bonded in a hexagonal planar geometry to six equivalent O2- atoms. All Ba–O bond lengths are 2.69 Å. There are two inequivalent Ni+3.50+ sites. In the first Ni+3.50+ site, Ni+3.50+ is bonded to six equivalent O2- atoms to form edge-sharing NiO6 octahedra. All Ni–O bond lengths are 2.02 Å. In the second Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form edge-sharing NiO6 octahedra. There is four shorter (1.89 Å) and two longer (1.91 Å) Ni–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+ and three Ni+3.50+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to three equivalent Ni+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li7(NiO2)11 by Materials Project

Li7(NiO2)11 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six NiO6 octahedra, edges with three LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 8–12°. There are a spread of Li–O bond distances ranging from 2.03–2.24 Å. In the second Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six NiO6 octahedra, edges with two equivalent LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 9–15°. There are four shorter (2.09 Å) and two longer (2.16 Å) Li–O bond lengths. In the third Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six NiO6 octahedra, edges with three LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 10–13°. There are a spread of Li–O bond distances ranging from 2.06–2.17 Å. In the fourth Li1+ site, Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six NiO6 octahedra, edges with three LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 8–12°. There are a spread of Li–O bond distances ranging from 2.06–2.19 Å. There are six inequivalent Ni+3.36+ sites. In the first Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three LiO6 octahedra, edges with four LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 10–11°. There are a spread of Ni–O bond distances ranging from 1.87–2.09 Å. In the second Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with five LiO6 octahedra, edges with three LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 8–15°. There are a spread of Ni–O bond distances ranging from 1.88–2.01 Å. In the third Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three LiO6 octahedra, edges with four LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 8–10°. There are a spread of Ni–O bond distances ranging from 1.84–1.93 Å. In the fourth Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four LiO6 octahedra, edges with four LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 9–11°. There are a spread of Ni–O bond distances ranging from 1.86–1.98 Å. In the fifth Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four LiO6 octahedra, edges with four LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are a spread of Ni–O bond distances ranging from 1.88–2.06 Å. In the sixth Ni+3.36+ site, Ni+3.36+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four LiO6 octahedra, edges with four LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 10–13°. There are a spread of Ni–O bond distances ranging from 1.87–2.07 Å. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the second O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the third O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Li1+ and three Ni+3.36+ atoms. In the fourth O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the fifth O2- site, O2- is bonded to two equivalent Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the sixth O2- site, O2- is bonded to two equivalent Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the seventh O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the eighth O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the ninth O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the tenth O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids. In the eleventh O2- site, O2- is bonded to two Li1+ and three Ni+3.36+ atoms to form a mixture of edge and corner-sharing OLi2Ni3 square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(NiO2)2 by Materials Project

Y(NiO2)2 is Spinel structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Y3+ is bonded to four O2- atoms to form YO4 tetrahedra that share corners with twelve NiO6 octahedra. The corner-sharing octahedral tilt angles are 60°. There are one shorter (2.13 Å) and three longer (2.14 Å) Y–O bond lengths. There are two inequivalent Ni+2.50+ sites. In the first Ni+2.50+ site, Ni+2.50+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six NiO6 octahedra. There are four shorter (2.05 Å) and two longer (2.08 Å) Ni–O bond lengths. In the second Ni+2.50+ site, Ni+2.50+ is bonded to six equivalent O2- atoms to form NiO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six equivalent NiO6 octahedra. All Ni–O bond lengths are 2.07 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Y3+ and three Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OYNi3 tetrahedra. In the second O2- site, O2- is bonded to one Y3+ and three equivalent Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OYNi3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(NiO2)2 by Materials Project

Y(NiO2)2 is Spinel structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Y3+ is bonded to four O2- atoms to form YO4 tetrahedra that share corners with twelve NiO6 octahedra. The corner-sharing octahedra tilt angles range from 59–61°. There are one shorter (2.13 Å) and three longer (2.15 Å) Y–O bond lengths. There are two inequivalent Ni+2.50+ sites. In the first Ni+2.50+ site, Ni+2.50+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six NiO6 octahedra. There are four shorter (2.04 Å) and two longer (2.10 Å) Ni–O bond lengths. In the second Ni+2.50+ site, Ni+2.50+ is bonded to six equivalent O2- atoms to form NiO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six equivalent NiO6 octahedra. All Ni–O bond lengths are 2.08 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Y3+ and three Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OYNi3 tetrahedra. In the second O2- site, O2- is bonded to one Y3+ and three equivalent Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OYNi3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiO2 by Materials Project

NiO2 is Rutile-like structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent Ni4+ sites. In the first Ni4+ site, Ni4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ni–O bond distances ranging from 1.86–1.89 Å. In the second Ni4+ site, Ni4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ni–O bond distances ranging from 1.85–1.88 Å. In the third Ni4+ site, Ni4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ni–O bond distances ranging from 1.85–1.88 Å. In the fourth Ni4+ site, Ni4+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ni–O bond distances ranging from 1.85–1.89 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni4+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni4+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to three Ni4+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to three Ni4+ atoms. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to three Ni4+ atoms. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to three Ni4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn(NiO2)2 by Materials Project

Zn(NiO2)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent Ni3+ sites. In the first Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO6 octahedra, corners with two equivalent ZnO5 square pyramids, edges with four NiO6 octahedra, and edges with three ZnO5 square pyramids. The corner-sharing octahedra tilt angles range from 50–58°. There are a spread of Ni–O bond distances ranging from 1.85–2.10 Å. In the second Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO6 octahedra, corners with four ZnO5 square pyramids, edges with four NiO6 octahedra, and a faceface with one ZnO5 square pyramid. The corner-sharing octahedra tilt angles range from 50–57°. There are a spread of Ni–O bond distances ranging from 1.91–2.22 Å. In the third Ni3+ site, Ni3+ is bonded to six O2- atoms to form distorted NiO6 octahedra that share corners with four NiO6 octahedra, corners with four ZnO5 square pyramids, edges with four NiO6 octahedra, and a faceface with one ZnO5 square pyramid. The corner-sharing octahedra tilt angles range from 50–58°. There are a spread of Ni–O bond distances ranging from 1.92–2.30 Å. In the fourth Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO6 octahedra, corners with two equivalent ZnO5 square pyramids, edges with four NiO6 octahedra, and edges with three ZnO5 square pyramids. The corner-sharing octahedra tilt angles range from 50–57°. There are a spread of Ni–O bond distances ranging from 1.86–2.09 Å. There are two inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to five O2- atoms to form ZnO5 square pyramids that share corners with six NiO6 octahedra, edges with three NiO6 octahedra, edges with two equivalent ZnO5 square pyramids, and a faceface with one NiO6 octahedra. The corner-sharing octahedra tilt angles range from 11–58°. There are a spread of Zn–O bond distances ranging from 2.04–2.14 Å. In the second Zn2+ site, Zn2+ is bonded to five O2- atoms to form ZnO5 square pyramids that share corners with six NiO6 octahedra, edges with three NiO6 octahedra, edges with two equivalent ZnO5 square pyramids, and a faceface with one NiO6 octahedra. The corner-sharing octahedra tilt angles range from 12–55°. There are a spread of Zn–O bond distances ranging from 2.03–2.12 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to three Ni3+ and one Zn2+ atom to form OZnNi3 trigonal pyramids that share corners with two equivalent OZn2Ni3 square pyramids, corners with two equivalent OZnNi3 trigonal pyramids, and edges with three OZn2Ni3 square pyramids. In the second O2- site, O2- is bonded in a trigonal planar geometry to three Ni3+ atoms. In the third O2- site, O2- is bonded in a trigonal planar geometry to three Ni3+ atoms. In the fourth O2- site, O2- is bonded to three Ni3+ and one Zn2+ atom to form OZnNi3 trigonal pyramids that share corners with two equivalent OZn2Ni3 square pyramids, corners with two equivalent OZnNi3 trigonal pyramids, and edges with three OZn2Ni3 square pyramids. In the fifth O2- site, O2- is bonded to three Ni3+ and two equivalent Zn2+ atoms to form OZn2Ni3 square pyramids that share corners with two equivalent OZnNi3 trigonal pyramids, edges with four OZn2Ni3 square pyramids, and edges with three OZnNi3 trigonal pyramids. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to three Ni3+ and two equivalent Zn2+ atoms. In the seventh O2- site, O2- is bonded to three Ni3+ and two equivalent Zn2+ atoms to form OZn2Ni3 square pyramids that share corners with two equivalent OZnNi3 trigonal pyramids, edges with four OZn2Ni3 square pyramids, and edges with three OZnNi3 trigonal pyramids. In the eighth O2- site, O2- is bonded in a 5-coordinate geometry to three Ni3+ and two equivalent Zn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(NiO2)4 by Materials Project

Ca(NiO2)4 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. Ca2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ca–O bond distances ranging from 2.45–2.89 Å. There are four inequivalent Ni+3.50+ sites. In the first Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedra tilt angles range from 52–56°. There are a spread of Ni–O bond distances ranging from 1.84–1.99 Å. In the second Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedra tilt angles range from 52–57°. There are a spread of Ni–O bond distances ranging from 1.86–2.03 Å. In the third Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedra tilt angles range from 54–56°. There are a spread of Ni–O bond distances ranging from 1.84–1.99 Å. In the fourth Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedra tilt angles range from 54–57°. There are a spread of Ni–O bond distances ranging from 1.85–2.01 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three Ni+3.50+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and three Ni+3.50+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and three Ni+3.50+ atoms. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three Ni+3.50+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and three Ni+3.50+ atoms. In the sixth O2- site, O2- is bonded to two equivalent Ca2+ and three Ni+3.50+ atoms to form distorted edge-sharing OCa2Ni3 trigonal bipyramids. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three Ni+3.50+ atoms. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and three Ni+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(NiO2)2 by Materials Project

Ca(NiO2)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.28–2.41 Å. In the second Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.28–2.40 Å. There are four inequivalent Ni3+ sites. In the first Ni3+ site, Ni3+ is bonded to five O2- atoms to form NiO5 square pyramids that share corners with four NiO6 octahedra and edges with two equivalent NiO5 square pyramids. The corner-sharing octahedra tilt angles range from 51–56°. There are a spread of Ni–O bond distances ranging from 1.94–2.02 Å. In the second Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO5 square pyramids and edges with four NiO6 octahedra. There are a spread of Ni–O bond distances ranging from 1.90–2.03 Å. In the third Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO5 square pyramids and edges with four NiO6 octahedra. There are a spread of Ni–O bond distances ranging from 1.91–2.05 Å. In the fourth Ni3+ site, Ni3+ is bonded to five O2- atoms to form NiO5 square pyramids that share corners with four NiO6 octahedra and edges with two equivalent NiO5 square pyramids. The corner-sharing octahedra tilt angles range from 52–56°. There are a spread of Ni–O bond distances ranging from 1.93–2.04 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni3+ atoms. In the second O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 tetrahedra that share corners with two equivalent OCa2Ni3 square pyramids, corners with two equivalent OCaNi3 tetrahedra, and edges with three OCa2Ni3 square pyramids. In the third O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with two equivalent OCa2Ni3 square pyramids, corners with two equivalent OCaNi3 trigonal pyramids, and edges with three OCa2Ni3 square pyramids. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni3+ atoms. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Ni3+ atoms. In the sixth O2- site, O2- is bonded to two equivalent Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 square pyramids that share corners with two equivalent OCaNi3 trigonal pyramids, edges with four OCa2Ni3 square pyramids, edges with two equivalent OCaNi3 tetrahedra, and an edgeedge with one OCaNi3 trigonal pyramid. In the seventh O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Ni3+ atoms. In the eighth O2- site, O2- is bonded to two equivalent Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 square pyramids that share corners with two equivalent OCaNi3 tetrahedra, edges with four OCa2Ni3 square pyramids, an edgeedge with one OCaNi3 tetrahedra, and edges with two equivalent OCaNi3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiO2 by Materials Project

NiO2 crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are two inequivalent Ni4+ sites. In the first Ni4+ site, Ni4+ is bonded to four O2- atoms to form corner-sharing NiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–58°. There is three shorter (1.85 Å) and one longer (1.90 Å) Ni–O bond length. In the second Ni4+ site, Ni4+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three equivalent NiO4 tetrahedra and edges with four equivalent NiO6 octahedra. There are a spread of Ni–O bond distances ranging from 1.85–1.99 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ni4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal pyramidal geometry to four Ni4+ atoms. In the third O2- site, O2- is bonded in a distorted T-shaped geometry to three equivalent Ni4+ atoms. In the fourth O2- site, O2- is bonded in a water-like geometry to two equivalent Ni4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(NiO2)2 by Materials Project

Ca(NiO2)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 pentagonal pyramids that share corners with six NiO6 octahedra and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 4–20°. There are a spread of Ca–O bond distances ranging from 2.36–2.39 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 pentagonal pyramids that share corners with six NiO6 octahedra and edges with six NiO6 octahedra. The corner-sharing octahedra tilt angles range from 4–20°. There are a spread of Ca–O bond distances ranging from 2.35–2.39 Å. In the third Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.38 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.38 Å. There are eight inequivalent Ni3+ sites. In the first Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three CaO6 pentagonal pyramids, edges with six NiO6 octahedra, and an edgeedge with one CaO6 pentagonal pyramid. There are a spread of Ni–O bond distances ranging from 1.88–2.13 Å. In the second Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three CaO6 pentagonal pyramids, edges with six NiO6 octahedra, and an edgeedge with one CaO6 pentagonal pyramid. There are a spread of Ni–O bond distances ranging from 1.88–2.11 Å. In the third Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three CaO6 pentagonal pyramids, edges with six NiO6 octahedra, and an edgeedge with one CaO6 pentagonal pyramid. There are a spread of Ni–O bond distances ranging from 1.88–2.13 Å. In the fourth Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three CaO6 pentagonal pyramids, edges with six NiO6 octahedra, and an edgeedge with one CaO6 pentagonal pyramid. There are a spread of Ni–O bond distances ranging from 1.88–2.12 Å. In the fifth Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share edges with six NiO6 octahedra and edges with two CaO6 pentagonal pyramids. There are a spread of Ni–O bond distances ranging from 1.90–2.16 Å. In the sixth Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share edges with six NiO6 octahedra and edges with two CaO6 pentagonal pyramids. There are a spread of Ni–O bond distances ranging from 1.91–2.16 Å. In the seventh Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share edges with six NiO6 octahedra and edges with two CaO6 pentagonal pyramids. There are a spread of Ni–O bond distances ranging from 1.91–2.13 Å. In the eighth Ni3+ site, Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share edges with six NiO6 octahedra and edges with two CaO6 pentagonal pyramids. There are a spread of Ni–O bond distances ranging from 1.91–2.14 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Ni3+ atoms. In the second O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with five OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and an edgeedge with one OCaNi3 trigonal pyramid. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Ni3+ atoms. In the fourth O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with five OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and an edgeedge with one OCaNi3 trigonal pyramid. In the fifth O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, and edges with four OCa2Ni3 trigonal bipyramids. In the sixth O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with six OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and an edgeedge with one OCaNi3 trigonal pyramid. In the seventh O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, and edges with four OCa2Ni3 trigonal bipyramids. In the eighth O2- site, O2- is bonded to one Ca2+ and three Ni3+ atoms to form distorted OCaNi3 trigonal pyramids that share corners with four OCa2Ni3 trigonal bipyramids, corners with six OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and an edgeedge with one OCaNi3 trigonal pyramid. In the ninth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with two OCaNi3 trigonal pyramids. In the tenth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with four OCaNi3 trigonal pyramids. In the eleventh O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with two OCaNi3 trigonal pyramids. In the twelfth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with four OCaNi3 trigonal pyramids. In the thirteenth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with two OCaNi3 trigonal pyramids. In the fourteenth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form distorted OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with four OCaNi3 trigonal pyramids. In the fifteenth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with two OCaNi3 trigonal pyramids. In the sixteenth O2- site, O2- is bonded to two Ca2+ and three Ni3+ atoms to form OCa2Ni3 trigonal bipyramids that share corners with five OCa2Ni3 trigonal bipyramids, corners with three OCaNi3 trigonal pyramids, edges with four OCa2Ni3 trigonal bipyramids, and edges with four OCaNi3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(NiO2)2 by Materials Project

Y(NiO2)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Y3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.35–2.41 Å. There are two inequivalent Ni+2.50+ sites. In the first Ni+2.50+ site, Ni+2.50+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.86 Å) and two longer (1.88 Å) Ni–O bond length. In the second Ni+2.50+ site, Ni+2.50+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.86 Å) and two longer (1.89 Å) Ni–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Y3+ and two Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OY2Ni2 tetrahedra. In the second O2- site, O2- is bonded to two equivalent Y3+ and two Ni+2.50+ atoms to form a mixture of distorted edge and corner-sharing OY2Ni2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(NiO2)3 by Materials Project

Li(NiO2)3 is Corundum-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Li1+ is bonded to six O2- atoms to form LiO6 octahedra that share corners with six NiO6 octahedra and edges with six NiO6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are two shorter (2.07 Å) and four longer (2.15 Å) Li–O bond lengths. There are two inequivalent Ni+3.67+ sites. In the first Ni+3.67+ site, Ni+3.67+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with two equivalent LiO6 octahedra, edges with two equivalent LiO6 octahedra, and edges with six equivalent NiO6 octahedra. The corner-sharing octahedral tilt angles are 13°. There is four shorter (1.90 Å) and two longer (2.08 Å) Ni–O bond length. In the second Ni+3.67+ site, Ni+3.67+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with two equivalent LiO6 octahedra, edges with two equivalent LiO6 octahedra, and edges with six NiO6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are a spread of Ni–O bond distances ranging from 1.85–1.91 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Li1+ and three Ni+3.67+ atoms. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Li1+ and three Ni+3.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Si(NiO2)2 by Materials Project

Ni2SiO4 is Ilmenite-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with eight NiO6 octahedra, corners with four equivalent SiO4 tetrahedra, edges with two equivalent NiO6 octahedra, and an edgeedge with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–61°. There are a spread of Ni–O bond distances ranging from 2.06–2.19 Å. In the second Ni2+ site, Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four equivalent NiO6 octahedra, corners with two equivalent SiO4 tetrahedra, edges with four NiO6 octahedra, and edges with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 56–61°. There are four shorter (2.09 Å) and two longer (2.13 Å) Ni–O bond lengths. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with six NiO6 octahedra and edges with three NiO6 octahedra. The corner-sharing octahedra tilt angles range from 55–60°. There are a spread of Si–O bond distances ranging from 1.63–1.67 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to three Ni2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ni2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ni2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2Na(NiO2)3 by Materials Project

NaBa2Ni3O6 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are four shorter (2.43 Å) and two longer (2.44 Å) Na–O bond lengths. There are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.77 Å) and four longer (2.81 Å) Ba–O bond lengths. In the second Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.86–3.11 Å. There are two inequivalent Ni+2.33+ sites. In the first Ni+2.33+ site, Ni+2.33+ is bonded in a square co-planar geometry to four O2- atoms. All Ni–O bond lengths are 1.89 Å. In the second Ni+2.33+ site, Ni+2.33+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Ni–O bond lengths are 1.85 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to one Na1+, three Ba2+, and two Ni+2.33+ atoms. In the second O2- site, O2- is bonded in a 6-coordinate geometry to one Na1+, three Ba2+, and two equivalent Ni+2.33+ atoms.

36 MATERIALS SCIENCE↗