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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KAl2Br7 by Materials Project

KAl2Br7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a 7-coordinate geometry to seven Br1- atoms. There are a spread of K–Br bond distances ranging from 3.43–3.83 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four Br1- atoms to form corner-sharing AlBr4 tetrahedra. There are a spread of Al–Br bond distances ranging from 2.30–2.47 Å. In the second Al3+ site, Al3+ is bonded to four Br1- atoms to form corner-sharing AlBr4 tetrahedra. There are a spread of Al–Br bond distances ranging from 2.30–2.45 Å. There are seven inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted single-bond geometry to one K1+ and one Al3+ atom. In the second Br1- site, Br1- is bonded in a distorted single-bond geometry to one K1+ and one Al3+ atom. In the third Br1- site, Br1- is bonded in a water-like geometry to two Al3+ atoms. In the fourth Br1- site, Br1- is bonded in a distorted single-bond geometry to two equivalent K1+ and one Al3+ atom. In the fifth Br1- site, Br1- is bonded in a distorted single-bond geometry to one K1+ and one Al3+ atom. In the sixth Br1- site, Br1- is bonded in a distorted L-shaped geometry to one K1+ and one Al3+ atom. In the seventh Br1- site, Br1- is bonded in a distorted bent 120 degrees geometry to one K1+ and one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3AlBr6 by Materials Project

K3AlBr6 is (Cubic) Perovskite-like structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to twelve equivalent Br1- atoms to form KBr12 cuboctahedra that share corners with twelve equivalent KBr12 cuboctahedra, faces with six equivalent KBr12 cuboctahedra, faces with four equivalent KBr6 octahedra, and faces with four equivalent AlBr6 octahedra. All K–Br bond lengths are 3.99 Å. In the second K1+ site, K1+ is bonded to six equivalent Br1- atoms to form KBr6 octahedra that share corners with six equivalent AlBr6 octahedra and faces with eight equivalent KBr12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All K–Br bond lengths are 3.11 Å. Al3+ is bonded to six equivalent Br1- atoms to form AlBr6 octahedra that share corners with six equivalent KBr6 octahedra and faces with eight equivalent KBr12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Al–Br bond lengths are 2.52 Å. Br1- is bonded in a distorted linear geometry to five K1+ and one Al3+ atom.

36 MATERIALS SCIENCE↗