SmNdCr4O12 crystallizes in the orthorhombic Amm2 space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(5), and four equivalent O(1) atoms. Nd(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(4) atoms. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 15-25°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Nd(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sm(1), one Nd(1), and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Nd(1) and two equivalent Cr(1) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sm(1) and two equivalent Cr(1) atoms.
SmNdCr4O12 crystallizes in the orthorhombic Amm2 space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(5), and four equivalent O(1) atoms. Both Sm(1)-O(2) bond lengths are 2.56 Å. Both Sm(1)-O(5) bond lengths are 2.43 Å. All Sm(1)-O(1) bond lengths are 2.45 Å. Nd(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(4) atoms. Both Nd(1)-O(2) bond lengths are 2.66 Å. Both Nd(1)-O(3) bond lengths are 2.37 Å. All Nd(1)-O(1) bond lengths are 2.87 Å. There are two shorter (2.32 Å) and two longer (3.03 Å) Nd(1)-O(4) bond lengths. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 15-25°. The Cr(1)-O(2) bond length is 1.95 Å. The Cr(1)-O(3) bond length is 1.91 Å. The Cr(1)-O(4) bond length is 1.91 Å. The Cr(1)-O(5) bond length is 1.90 Å. There is one shorter (1.82 Å) and one longer (2.01 Å) Cr(1)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Nd(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sm(1), one Nd(1), and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Nd(1) and two equivalent Cr(1) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sm(1) and two equivalent Cr(1) atoms.