SrNb4O14 crystallizes in the trigonal R-3m space group. Sr(1) is bonded to two equivalent O(3) and six equivalent O(1) atoms to form SrO8 hexagonal bipyramids that share edges with six equivalent Nb(2)O6 octahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to six equivalent O(2) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 37°. In the second Nb site, Nb(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Sr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-40°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent Nb(2) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Sr(1) atom.
SrNb4O14 crystallizes in the trigonal R-3m space group. Sr(1) is bonded to two equivalent O(3) and six equivalent O(1) atoms to form SrO8 hexagonal bipyramids that share edges with six equivalent Nb(2)O6 octahedra. Both Sr(1)-O(3) bond lengths are 2.72 Å. All Sr(1)-O(1) bond lengths are 2.69 Å. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to six equivalent O(2) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 37°. All Nb(1)-O(2) bond lengths are 2.00 Å. In the second Nb site, Nb(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Sr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-40°. Both Nb(2)-O(2) bond lengths are 2.00 Å. All Nb(2)-O(1) bond lengths are 2.00 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent Nb(2) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Nb(1) and one Nb(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Sr(1) atom.