Materials Data on Ca(BO2)3 by Materials Project

Ca(BO2)3 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.67 Å. There are three inequivalent B sites. In the first B site, B is bonded in a trigonal planar geometry to three O atoms. All B–O bond lengths are 1.38 Å. In the second B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.51 Å. In the third B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.44–1.51 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to one Ca and two B atoms. In the second O site, O is bonded in a 1-coordinate geometry to two equivalent Ca and one B atom. In the third O site, O is bonded in a distorted trigonal planar geometry to one Ca and two B atoms. In the fourth O site, O is bonded in a distorted bent 120 degrees geometry to one Ca and two B atoms. In the fifth O site, O is bonded in a distorted trigonal planar geometry to one Ca and two B atoms. In the sixth O site, O is bonded in a 2-coordinate geometry to one Ca and two B atoms.