NaBe4SbO7 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form NaO6 octahedra that share corners with three equivalent Be(2)O4 tetrahedra and corners with nine equivalent Be(1)O4 tetrahedra. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form BeO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-62°. In the second Be site, Be(2) is bonded to one O(3) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra and corners with six equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. Sb(1) is bonded in a 3-coordinate geometry to three equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Be(1), and one Be(2) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Be(1), and one Sb(1) atom to form ONaBe2Sb trigonal pyramids that share corners with two equivalent O(3)Be4 tetrahedra, corners with two equivalent O(2)NaBe2Sb trigonal pyramids, and edges with two equivalent O(2)NaBe2Sb trigonal pyramids. In the third O site, O(3) is bonded to one Be(2) and three equivalent Be(1) atoms to form corner-sharing OBe4 tetrahedra.
NaBe4SbO7 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form NaO6 octahedra that share corners with three equivalent Be(2)O4 tetrahedra and corners with nine equivalent Be(1)O4 tetrahedra. All Na(1)-O(1) bond lengths are 2.29 Å. All Na(1)-O(2) bond lengths are 2.22 Å. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form BeO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-62°. The Be(1)-O(1) bond length is 1.59 Å. The Be(1)-O(3) bond length is 1.74 Å. Both Be(1)-O(2) bond lengths are 1.72 Å. In the second Be site, Be(2) is bonded to one O(3) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra and corners with six equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. The Be(2)-O(3) bond length is 1.66 Å. All Be(2)-O(1) bond lengths are 1.61 Å. Sb(1) is bonded in a 3-coordinate geometry to three equivalent O(2) atoms. All Sb(1)-O(2) bond lengths are 2.04 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Be(1), and one Be(2) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Be(1), and one Sb(1) atom to form ONaBe2Sb trigonal pyramids that share corners with two equivalent O(3)Be4 tetrahedra, corners with two equivalent O(2)NaBe2Sb trigonal pyramids, and edges with two equivalent O(2)NaBe2Sb trigonal pyramids. In the third O site, O(3) is bonded to one Be(2) and three equivalent Be(1) atoms to form corner-sharing OBe4 tetrahedra.