Materials Data on SrAl(OF2)2 by Materials Project
SrAl(OF2)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Sr is bonded in a 9-coordinate geometry to two equivalent O and seven F atoms. There are one shorter (2.76 Å) and one longer (2.84 Å) Sr–O bond lengths. There are a spread of Sr–F bond distances ranging from 2.46–2.70 Å. Al is bonded to two equivalent O and four F atoms to form edge-sharing AlO2F4 octahedra. There is one shorter (1.95 Å) and one longer (1.98 Å) Al–O bond length. There are a spread of Al–F bond distances ranging from 1.75–1.82 Å. There are two inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to two equivalent Al atoms. In the second O site, O is bonded in a bent 150 degrees geometry to two equivalent Sr atoms. There are four inequivalent F sites. In the first F site, F is bonded in a 1-coordinate geometry to two equivalent Sr and one Al atom. In the second F site, F is bonded in a distorted bent 150 degrees geometry to one Sr and one Al atom. In the third F site, F is bonded in a 1-coordinate geometry to two equivalent Sr and one Al atom. In the fourth F site, F is bonded in a 1-coordinate geometry to two equivalent Sr and one Al atom.