Materials Data on CaB2H2O7 by Materials Project
CaB2H2O7 crystallizes in the triclinic P-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 2.30–2.99 Å. There are two inequivalent B sites. In the first B site, B is bonded in a trigonal planar geometry to three O atoms. There is two shorter (1.37 Å) and one longer (1.39 Å) B–O bond length. In the second B site, B is bonded in a tetrahedral geometry to four O atoms. There are a spread of B–O bond distances ranging from 1.40–1.54 Å. There are two inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. There are seven inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two equivalent Ca and one B atom. In the second O site, O is bonded in a 2-coordinate geometry to one Ca and two B atoms. In the third O site, O is bonded in a distorted single-bond geometry to one Ca and one B atom. In the fourth O site, O is bonded in a water-like geometry to one B and one H atom. In the fifth O site, O is bonded in a distorted single-bond geometry to two equivalent Ca and one B atom. In the sixth O site, O is bonded in a bent 120 degrees geometry to one B and one H atom. In the seventh O site, O is bonded in a bent 150 degrees geometry to one Ca and one O atom. The O–O bond length is 1.23 Å.