Materials Data on Na2B4O17 by Materials Project
Na2B4O17 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 2-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.21–3.01 Å. In the second Na site, Na is bonded in a hexagonal planar geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.61–2.90 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 are a spread of B–O bond distances ranging from 1.38–1.42 Å. In the second B site, B is bonded in a trigonal planar geometry to three O atoms. There are a spread of B–O bond distances ranging from 1.31–1.48 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Na and one O atom. The O–O bond length is 1.24 Å. In the second O site, O is bonded in a bent 120 degrees geometry to one Na and one B atom. In the third O site, O is bonded in a bent 120 degrees geometry to one Na and one O atom. The O–O bond length is 1.25 Å. In the fourth O site, O is bonded in a bent 120 degrees geometry to one Na and one O atom. In the fifth O site, O is bonded in a distorted bent 120 degrees geometry to one Na and one O atom. The O–O bond length is 1.23 Å. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Na and one O atom. In the seventh O site, O is bonded in an L-shaped geometry to two equivalent B atoms. In the eighth O site, O is bonded in a water-like geometry to two B atoms. In the ninth O site, O is bonded in a bent 120 degrees geometry to two B atoms.