Sm4Fe3Co(AsO)4 crystallizes in the tetragonal P-4m2 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent As(1), two equivalent O(1), and two equivalent O(2) atoms. In the second Sm site, Sm(2) is bonded in a 4-coordinate geometry to four equivalent As(2), two equivalent O(1), and two equivalent O(2) atoms. In the third Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent As(1), two equivalent O(1), and two equivalent O(2) atoms. In the fourth Sm site, Sm(2) is bonded in a 4-coordinate geometry to four equivalent As(2), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1,3) is bonded to four equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the second Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form distorted corner-sharing FeAs4 tetrahedra. Co(1) is bonded in a 4-coordinate geometry to four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1), two equivalent Fe(2), and two equivalent Co(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Sm(2) and four equivalent Fe(1,3) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra.
Sm4Fe3Co(AsO)4 crystallizes in the tetragonal P-4m2 space group. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent As(1), two equivalent O(1), and two equivalent O(2) atoms. All Sm(1)-As(1) bond lengths are 3.36 Å. Both Sm(1)-O(1) bond lengths are 2.31 Å. Both Sm(1)-O(2) bond lengths are 2.31 Å. In the second Sm site, Sm(2) is bonded in a 4-coordinate geometry to four equivalent As(2), two equivalent O(1), and two equivalent O(2) atoms. All Sm(2)-As(2) bond lengths are 3.35 Å. Both Sm(2)-O(1) bond lengths are 2.31 Å. Both Sm(2)-O(2) bond lengths are 2.31 Å. In the third Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent As(1), two equivalent O(1), and two equivalent O(2) atoms. All Sm(1)-As(1) bond lengths are 3.36 Å. Both Sm(1)-O(1) bond lengths are 2.31 Å. Both Sm(1)-O(2) bond lengths are 2.31 Å. In the fourth Sm site, Sm(2) is bonded in a 4-coordinate geometry to four equivalent As(2), two equivalent O(1), and two equivalent O(2) atoms. All Sm(2)-As(2) bond lengths are 3.35 Å. Both Sm(2)-O(1) bond lengths are 2.31 Å. Both Sm(2)-O(2) bond lengths are 2.31 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1,3) is bonded to four equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. All Fe(1,3)-As(2) bond lengths are 2.61 Å. In the second Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form distorted corner-sharing FeAs4 tetrahedra. All Fe(2)-As(1) bond lengths are 2.57 Å. Co(1) is bonded in a 4-coordinate geometry to four equivalent As(1) atoms. All Co(1)-As(1) bond lengths are 2.57 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Sm(1), two equivalent Fe(2), and two equivalent Co(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Sm(2) and four equivalent Fe(1,3) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra.