SrNb2O4 crystallizes in the orthorhombic Pbcm space group. Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), and four equivalent O(3) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted edge-sharing NbO6 pentagonal pyramids. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form distorted edge-sharing NbO6 pentagonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Nb(2), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Nb(2), and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nb(1), and two equivalent Nb(2) atoms to form a mixture of corner, face, and edge-sharing OSr2Nb3 trigonal bipyramids.
SrNb2O4 crystallizes in the orthorhombic Pbcm space group. Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), and four equivalent O(3) atoms. The Sr(1)-O(1) bond length is 2.40 Å. The Sr(1)-O(2) bond length is 2.43 Å. There are two shorter (2.51 Å) and two longer (2.58 Å) Sr(1)-O(3) bond lengths. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted edge-sharing NbO6 pentagonal pyramids. Both Nb(1)-O(1) bond lengths are 2.16 Å. Both Nb(1)-O(2) bond lengths are 2.13 Å. Both Nb(1)-O(3) bond lengths are 2.18 Å. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form distorted edge-sharing NbO6 pentagonal pyramids. The Nb(2)-O(1) bond length is 2.12 Å. The Nb(2)-O(2) bond length is 2.15 Å. There are two shorter (2.17 Å) and two longer (2.18 Å) Nb(2)-O(3) bond lengths. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Nb(2), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Nb(2), and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nb(1), and two equivalent Nb(2) atoms to form a mixture of corner, face, and edge-sharing OSr2Nb3 trigonal bipyramids.