Materials Data on Sr2Mg(BO3)2 by Materials Project

Sr2Mg(BO3)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Sr2+ is bonded in a distorted q6 geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.60–2.74 Å. Mg2+ is bonded in an octahedral geometry to six O2- atoms. There are four shorter (2.10 Å) and two longer (2.16 Å) Mg–O bond lengths. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.38 Å) and two longer (1.40 Å) B–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Sr2+, one Mg2+, and one B3+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Sr2+, one Mg2+, and one B3+ atom.