DOE OSTI2020
CsZn2B3O7 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. there are three inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 7-coordinate geometry to nine O2- atoms. There are a spread of Cs–O bond distances ranging from 3.21–3.61 Å. In the second Cs1+ site, Cs1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Cs–O bond distances ranging from 3.26–3.44 Å. In the third Cs1+ site, Cs1+ is bonded to eight O2- atoms to form CsO8 hexagonal bipyramids that share corners with four ZnO4 tetrahedra. There are a spread of Cs–O bond distances ranging from 3.25–3.36 Å. There are three inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to four O2- atoms to form corner-sharing ZnO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.93–1.99 Å. In the second Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one CsO8 hexagonal bipyramid and corners with three ZnO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.95–2.02 Å. In the third Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share a cornercorner with one CsO8 hexagonal bipyramid and corners with three ZnO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.94–2.00 Å. There are six inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.38 Å) and one longer (1.39 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.33 Å) and two longer (1.42 Å) B–O bond length. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.34–1.41 Å. In the fourth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.39 Å. In the fifth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.34–1.41 Å. In the sixth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.39 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Cs1+, one Zn2+, and one B3+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two Cs1+ and two B3+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Cs1+, one Zn2+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cs1+, two equivalent Zn2+, and one B3+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one B3+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cs1+, two Zn2+, and one B3+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cs1+, two equivalent Zn2+, and one B3+ atom. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to two Cs1+ and two B3+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cs1+, two Zn2+, and one B3+ atom. In the tenth O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Zn2+ and one B3+ atom. In the eleventh O2- site, O2- is bonded in a bent 120 degrees geometry to two B3+ atoms. In the twelfth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Cs1+, one Zn2+, and one B3+ atom.