SmTaO4 crystallizes in the orthorhombic Cmc2_1 space group. Sm(1) is bonded in a 7-coordinate geometry to one O(1), three equivalent O(2), and three equivalent O(3) atoms. Ta(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 15-40°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sm(1) and two equivalent Ta(1) atoms. In the second O site, O(2) is bonded to three equivalent Sm(1) and one Ta(1) atom to form corner-sharing OSm3Ta tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Sm(1) and one Ta(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms.
SmTaO4 crystallizes in the orthorhombic Cmc2_1 space group. Sm(1) is bonded in a 7-coordinate geometry to one O(1), three equivalent O(2), and three equivalent O(3) atoms. The Sm(1)-O(1) bond length is 2.60 Å. There is one shorter (2.30 Å) and two longer (2.35 Å) Sm(1)-O(2) bond lengths. There are two shorter (2.54 Å) and one longer (2.57 Å) Sm(1)-O(3) bond length. Ta(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 15-40°. The Ta(1)-O(2) bond length is 2.10 Å. The Ta(1)-O(3) bond length is 1.93 Å. Both Ta(1)-O(1) bond lengths are 1.98 Å. There is one shorter (1.92 Å) and one longer (2.09 Å) Ta(1)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Sm(1) and two equivalent Ta(1) atoms. In the second O site, O(2) is bonded to three equivalent Sm(1) and one Ta(1) atom to form corner-sharing OSm3Ta tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Sm(1) and one Ta(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms.