SrEuNdNbO6 crystallizes in the orthorhombic Pnnn space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a q6 geometry to four equivalent O(1), four equivalent O(2), and four equivalent O(3) 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 Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-29°. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share corners with six equivalent Nd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-29°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), one Nd(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Eu(2), one Nd(1), and one Nb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Eu(2), one Nd(1), and one Nb(1) atom.
SrEuNdNbO6 crystallizes in the orthorhombic Pnnn space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. All Sr(1)-O(2) bond lengths are 2.48 Å. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. All Sr(2)-O(3) bond lengths are 2.48 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. All Eu(1)-O(1) bond lengths are 2.47 Å. In the second Eu site, Eu(2) is bonded in a q6 geometry to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. All Eu(2)-O(1) bond lengths are 3.00 Å. All Eu(2)-O(2) bond lengths are 3.01 Å. All Eu(2)-O(3) bond lengths are 3.00 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 Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-29°. Both Nd(1)-O(1) bond lengths are 2.36 Å. Both Nd(1)-O(2) bond lengths are 2.35 Å. Both Nd(1)-O(3) bond lengths are 2.35 Å. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share corners with six equivalent Nd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-29°. Both Nb(1)-O(1) bond lengths are 2.04 Å. Both Nb(1)-O(2) bond lengths are 2.03 Å. Both Nb(1)-O(3) bond lengths are 2.03 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(2), one Nd(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Eu(2), one Nd(1), and one Nb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Eu(2), one Nd(1), and one Nb(1) atom.