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DOE OSTI2020

Materials Data on KMnBr3 by Materials Project

KMnBr3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of K–Br bond distances ranging from 3.42–3.67 Å. Mn2+ is bonded to six Br1- atoms to form edge-sharing MnBr6 octahedra. There are a spread of Mn–Br bond distances ranging from 2.58–2.78 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Mn2+ atom. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to three equivalent K1+ and two equivalent Mn2+ atoms. In the third Br1- site, Br1- is bonded in a 4-coordinate geometry to one K1+ and three equivalent Mn2+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on K4MnBr6 by Materials Project

K4MnBr6 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six equivalent Br1- atoms. All K–Br bond lengths are 3.26 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight equivalent Br1- atoms. There are a spread of K–Br bond distances ranging from 3.40–3.58 Å. Mn2+ is bonded in an octahedral geometry to six equivalent Br1- atoms. All Mn–Br bond lengths are 2.73 Å. Br1- is bonded to five K1+ and one Mn2+ atom to form a mixture of distorted corner, edge, and face-sharing BrK5Mn octahedra. The corner-sharing octahedra tilt angles range from 0–64°.

36 MATERIALS SCIENCE↗