GdSm(MnNi4)2 crystallizes in the orthorhombic Pmm2 space group. Gd(1) is bonded in a 18-coordinate geometry to one Mn(1), two equivalent Mn(2), one Ni(2), two equivalent Ni(1), four equivalent Ni(3), four equivalent Ni(5), and four equivalent Ni(6) atoms. Sm(1) is bonded in a 18-coordinate geometry to one Mn(2), two equivalent Mn(1), one Ni(1), two equivalent Ni(2), four equivalent Ni(4), four equivalent Ni(5), and four equivalent Ni(6) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one Gd(1), two equivalent Sm(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(4), and four equivalent Ni(5) atoms to form distorted MnSm2GdNi9 cuboctahedra that share corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with five equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, edges with four equivalent Mn(2)SmGd2Ni9 cuboctahedra,  a faceface with one Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra. In the second Mn site, Mn(2) is bonded to two equivalent Gd(1), one Sm(1), one Ni(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(6) atoms to form distorted MnSmGd2Ni9 cuboctahedra that share corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with five equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, edges with four equivalent Mn(1)Sm2GdNi9 cuboctahedra,  a faceface with one Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Gd(1), one Sm(1), one Mn(2), two equivalent Mn(1), two equivalent Ni(3), and four equivalent Ni(5) atoms to form NiSmGd2Mn3Ni6 cuboctahedra that share corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with five equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, edges with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra,  a faceface with one Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded to one Gd(1), two equivalent Sm(1), one Mn(1), two equivalent Mn(2), two equivalent Ni(4), and four equivalent Ni(6) atoms to form NiSm2GdMn3Ni6 cuboctahedra that share corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with five equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, edges with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra,  a faceface with one Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra. In the third Ni site, Ni(3) is bonded to four equivalent Gd(1), two equivalent Mn(2), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Ni(6) atoms to form distorted NiGd4Mn2Ni6 cuboctahedra that share corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to four equivalent Sm(1), two equivalent Mn(1), two equivalent Ni(2), two equivalent Ni(5), and two equivalent Ni(6) atoms to form distorted NiSm4Mn2Ni6 cuboctahedra that share corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra. In the fifth Ni site, Ni(5) is bonded to two equivalent Gd(1), two equivalent Sm(1), two equivalent Mn(1), one Ni(3), one Ni(4), two equivalent Ni(1), and two equivalent Ni(5) atoms to form distorted NiSm2Gd2Mn2Ni6 cuboctahedra that share corners with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with ten equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra. In the sixth Ni site, Ni(6) is bonded to two equivalent Gd(1), two equivalent Sm(1), two equivalent Mn(2), one Ni(3), one Ni(4), two equivalent Ni(2), and two equivalent Ni(6) atoms to form distorted NiSm2Gd2Mn2Ni6 cuboctahedra that share corners with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with ten equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra.
GdSm(MnNi4)2 crystallizes in the orthorhombic Pmm2 space group. Gd(1) is bonded in a 18-coordinate geometry to one Mn(1), two equivalent Mn(2), one Ni(2), two equivalent Ni(1), four equivalent Ni(3), four equivalent Ni(5), and four equivalent Ni(6) atoms. The Gd(1)-Mn(1) bond length is 2.87 Å. Both Gd(1)-Mn(2) bond lengths are 2.88 Å. The Gd(1)-Ni(2) bond length is 2.87 Å. Both Gd(1)-Ni(1) bond lengths are 2.88 Å. All Gd(1)-Ni(3) bond lengths are 3.18 Å. All Gd(1)-Ni(5) bond lengths are 3.17 Å. All Gd(1)-Ni(6) bond lengths are 3.17 Å. Sm(1) is bonded in a 18-coordinate geometry to one Mn(2), two equivalent Mn(1), one Ni(1), two equivalent Ni(2), four equivalent Ni(4), four equivalent Ni(5), and four equivalent Ni(6) atoms. The Sm(1)-Mn(2) bond length is 2.89 Å. Both Sm(1)-Mn(1) bond lengths are 2.88 Å. The Sm(1)-Ni(1) bond length is 2.89 Å. Both Sm(1)-Ni(2) bond lengths are 2.89 Å. All Sm(1)-Ni(4) bond lengths are 3.18 Å. All Sm(1)-Ni(5) bond lengths are 3.18 Å. All Sm(1)-Ni(6) bond lengths are 3.18 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one Gd(1), two equivalent Sm(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(4), and four equivalent Ni(5) atoms to form distorted MnSm2GdNi9 cuboctahedra that share corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with five equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, edges with four equivalent Mn(2)SmGd2Ni9 cuboctahedra,  a faceface with one Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra. The Mn(1)-Ni(2) bond length is 2.89 Å. Both Mn(1)-Ni(1) bond lengths are 2.88 Å. Both Mn(1)-Ni(4) bond lengths are 2.45 Å. All Mn(1)-Ni(5) bond lengths are 2.45 Å. In the second Mn site, Mn(2) is bonded to two equivalent Gd(1), one Sm(1), one Ni(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(6) atoms to form distorted MnSmGd2Ni9 cuboctahedra that share corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with five equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, edges with four equivalent Mn(1)Sm2GdNi9 cuboctahedra,  a faceface with one Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra. The Mn(2)-Ni(1) bond length is 2.86 Å. Both Mn(2)-Ni(2) bond lengths are 2.88 Å. Both Mn(2)-Ni(3) bond lengths are 2.45 Å. All Mn(2)-Ni(6) bond lengths are 2.45 Å. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Gd(1), one Sm(1), one Mn(2), two equivalent Mn(1), two equivalent Ni(3), and four equivalent Ni(5) atoms to form NiSmGd2Mn3Ni6 cuboctahedra that share corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with five equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, edges with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra,  a faceface with one Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra. Both Ni(1)-Ni(3) bond lengths are 2.42 Å. All Ni(1)-Ni(5) bond lengths are 2.43 Å. In the second Ni site, Ni(2) is bonded to one Gd(1), two equivalent Sm(1), one Mn(1), two equivalent Mn(2), two equivalent Ni(4), and four equivalent Ni(6) atoms to form NiSm2GdMn3Ni6 cuboctahedra that share corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with five equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with eight equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, edges with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra,  a faceface with one Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with eight equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra. Both Ni(2)-Ni(4) bond lengths are 2.43 Å. All Ni(2)-Ni(6) bond lengths are 2.43 Å. In the third Ni site, Ni(3) is bonded to four equivalent Gd(1), two equivalent Mn(2), two equivalent Ni(1), two equivalent Ni(5), and two equivalent Ni(6) atoms to form distorted NiGd4Mn2Ni6 cuboctahedra that share corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra. Both Ni(3)-Ni(5) bond lengths are 2.46 Å. Both Ni(3)-Ni(6) bond lengths are 2.53 Å. In the fourth Ni site, Ni(4) is bonded to four equivalent Sm(1), two equivalent Mn(1), two equivalent Ni(2), two equivalent Ni(5), and two equivalent Ni(6) atoms to form distorted NiSm4Mn2Ni6 cuboctahedra that share corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with four equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra. Both Ni(4)-Ni(5) bond lengths are 2.53 Å. Both Ni(4)-Ni(6) bond lengths are 2.46 Å. In the fifth Ni site, Ni(5) is bonded to two equivalent Gd(1), two equivalent Sm(1), two equivalent Mn(1), one Ni(3), one Ni(4), two equivalent Ni(1), and two equivalent Ni(5) atoms to form distorted NiSm2Gd2Mn2Ni6 cuboctahedra that share corners with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, corners with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, corners with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, corners with ten equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with four equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra. There is one shorter (2.47 Å) and one longer (2.52 Å) Ni(5)-Ni(5) bond length. In the sixth Ni site, Ni(6) is bonded to two equivalent Gd(1), two equivalent Sm(1), two equivalent Mn(2), one Ni(3), one Ni(4), two equivalent Ni(2), and two equivalent Ni(6) atoms to form distorted NiSm2Gd2Mn2Ni6 cuboctahedra that share corners with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, corners with two equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, corners with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, corners with four equivalent Mn(1)Sm2GdNi9 cuboctahedra, corners with four equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, corners with ten equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, edges with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, edges with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, edges with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Mn(1)Sm2GdNi9 cuboctahedra, faces with two equivalent Ni(3)Gd4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(5)Sm2Gd2Mn2Ni6 cuboctahedra, faces with two equivalent Ni(4)Sm4Mn2Ni6 cuboctahedra, faces with two equivalent Ni(1)SmGd2Mn3Ni6 cuboctahedra, faces with four equivalent Mn(2)SmGd2Ni9 cuboctahedra, faces with four equivalent Ni(6)Sm2Gd2Mn2Ni6 cuboctahedra, and faces with four equivalent Ni(2)Sm2GdMn3Ni6 cuboctahedra. There is one shorter (2.46 Å) and one longer (2.53 Å) Ni(6)-Ni(6) bond length.