BiNdSr2O6 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(3), three equivalent O(1), and three equivalent O(2) atoms. Nd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NdO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-35°. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share corners with six equivalent Nd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-35°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Nd(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Nd(1), and one Bi(1) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(1), and one Bi(1) atom to form distorted corner-sharing OSr2NdBi tetrahedra.
BiNdSr2O6 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(3), three equivalent O(1), and three equivalent O(2) atoms. There is one shorter (2.53 Å) and one longer (2.64 Å) Sr(1)-O(3) bond length. There are a spread of Sr(1)-O(1) bond distances ranging from 2.55-3.08 Å. There are a spread of Sr(1)-O(2) bond distances ranging from 2.55-3.12 Å. Nd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NdO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-35°. Both Nd(1)-O(1) bond lengths are 2.34 Å. Both Nd(1)-O(2) bond lengths are 2.36 Å. Both Nd(1)-O(3) bond lengths are 2.36 Å. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share corners with six equivalent Nd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-35°. Both Bi(1)-O(1) bond lengths are 2.15 Å. Both Bi(1)-O(2) bond lengths are 2.16 Å. Both Bi(1)-O(3) bond lengths are 2.16 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Nd(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Nd(1), and one Bi(1) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(1), and one Bi(1) atom to form distorted corner-sharing OSr2NdBi tetrahedra.