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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KAlO by Materials Project

KAlO crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 4-coordinate geometry to four O atoms. There are a spread of K–O bond distances ranging from 2.90–3.18 Å. In the second K site, K is bonded in a 2-coordinate geometry to two O atoms. There are one shorter (2.87 Å) and one longer (3.00 Å) K–O bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a water-like geometry to two O atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) Al–O bond length. In the second Al site, Al is bonded in a water-like geometry to two O atoms. There is one shorter (1.80 Å) and one longer (1.81 Å) Al–O bond length. There are two inequivalent O sites. In the first O site, O is bonded in a distorted linear geometry to three K and two Al atoms. In the second O site, O is bonded in a 2-coordinate geometry to three K and two Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KAlO2 by Materials Project

KAlO2 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.72–2.83 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.83–3.21 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.78 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. There is one shorter (1.77 Å) and three longer (1.78 Å) Al–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four K1+ and two equivalent Al3+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to three equivalent K1+ and two Al3+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two K1+ and two equivalent Al3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to three K1+ and two Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3AlO3 by Materials Project

K3AlO3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 1-coordinate geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.57–2.87 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.73–3.20 Å. In the third K1+ site, K1+ is bonded to four equivalent O2- atoms to form distorted KO4 tetrahedra that share corners with four equivalent AlO4 tetrahedra and edges with two equivalent KO4 tetrahedra. There are two shorter (2.77 Å) and two longer (2.80 Å) K–O bond lengths. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four equivalent KO4 tetrahedra and an edgeedge with one AlO4 tetrahedra. There is two shorter (1.77 Å) and two longer (1.85 Å) Al–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to six K1+ and one Al3+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to three K1+ and two equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KAlO3 by Materials Project

KAlO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. K is bonded to twelve equivalent O atoms to form KO12 cuboctahedra that share corners with twelve equivalent KO12 cuboctahedra, faces with six equivalent KO12 cuboctahedra, and faces with eight equivalent AlO6 octahedra. All K–O bond lengths are 2.73 Å. Al is bonded to six equivalent O atoms to form AlO6 octahedra that share corners with six equivalent AlO6 octahedra and faces with eight equivalent KO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Al–O bond lengths are 1.93 Å. O is bonded in a distorted linear geometry to four equivalent K and two equivalent Al atoms.

36 MATERIALS SCIENCE↗