TaCoNi2 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to four Co(1,1,1,1); two equivalent Ni(1); two equivalent Ni(3); and four Ni(2,2) atoms to form TaCo4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with six equivalent Ta(1)Co4Ni8 cuboctahedra; corners with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ta(2)Co4Ni8 cuboctahedra. In the second Ta site, Ta(2) is bonded to four Co(1,1); two equivalent Ni(1); two equivalent Ni(3); and four Ni(2,2) atoms to form TaCo4Ni8 cuboctahedra that share corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with six equivalent Ta(2)Co4Ni8 cuboctahedra; corners with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ta(1)Co4Ni8 cuboctahedra. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. In the second Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. In the third Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. In the fourth Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ta(1); two equivalent Ta(2); four Co(1,1,1,1); and four Ni(2,2) atoms to form NiTa4Co4Ni4 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with six equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ni(3)Ta4Co4Ni4 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted NiTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with ten Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with two equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with eight Co(1,1,1)Ta4Co2Ni6 cuboctahedra. In the third Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted NiTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with ten Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with two equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with eight Co(1,1,1)Ta4Co2Ni6 cuboctahedra. In the fourth Ni site, Ni(3) is bonded to two equivalent Ta(1); two equivalent Ta(2); four Co(1,1); and four Ni(2,2) atoms to form distorted NiTa4Co4Ni4 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with six equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ni(1)Ta4Co4Ni4 cuboctahedra.
TaCoNi2 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to four Co(1,1,1,1); two equivalent Ni(1); two equivalent Ni(3); and four Ni(2,2) atoms to form TaCo4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with six equivalent Ta(1)Co4Ni8 cuboctahedra; corners with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ta(2)Co4Ni8 cuboctahedra. There are two shorter (2.55 Å) and two longer (2.57 Å) Ta(1)-Co(1,1,1,1) bond lengths. Both Ta(1)-Ni(1) bond lengths are 2.59 Å. Both Ta(1)-Ni(3) bond lengths are 2.60 Å. All Ta(1)-Ni(2,2) bond lengths are 2.58 Å. In the second Ta site, Ta(2) is bonded to four Co(1,1); two equivalent Ni(1); two equivalent Ni(3); and four Ni(2,2) atoms to form TaCo4Ni8 cuboctahedra that share corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with six equivalent Ta(2)Co4Ni8 cuboctahedra; corners with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ta(1)Co4Ni8 cuboctahedra. All Ta(2)-Co(1,1) bond lengths are 2.58 Å. Both Ta(2)-Ni(1) bond lengths are 2.60 Å. Both Ta(2)-Ni(3) bond lengths are 2.59 Å. There are two shorter (2.54 Å) and two longer (2.58 Å) Ta(2)-Ni(2,2) bond lengths. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. There is one shorter (2.46 Å) and one longer (2.72 Å) Co(1)-Co(1) bond length. There is one shorter (2.46 Å) and one longer (2.65 Å) Co(1)-Ni(1) bond length. Both Co(1)-Ni(2) bond lengths are 2.52 Å. Both Co(1)-Ni(3) bond lengths are 2.51 Å. In the second Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. There is one shorter (2.46 Å) and one longer (2.65 Å) Co(1)-Ni(1) bond length. Both Co(1)-Ni(2) bond lengths are 2.52 Å. Both Co(1)-Ni(3) bond lengths are 2.51 Å. In the third Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. Both Co(1)-Ta(2) bond lengths are 2.58 Å. There is one shorter (2.46 Å) and one longer (2.72 Å) Co(1)-Co(1) bond length. There is one shorter (2.46 Å) and one longer (2.65 Å) Co(1)-Ni(1) bond length. Both Co(1)-Ni(2) bond lengths are 2.52 Å. Both Co(1)-Ni(3) bond lengths are 2.51 Å. In the fourth Co site, Co(1) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted CoTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with ten Co(1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with two equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; and faces with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra. Both Co(1)-Ta(2) bond lengths are 2.58 Å. There is one shorter (2.46 Å) and one longer (2.65 Å) Co(1)-Ni(1) bond length. Both Co(1)-Ni(2) bond lengths are 2.52 Å. Both Co(1)-Ni(3) bond lengths are 2.51 Å. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ta(1); two equivalent Ta(2); four Co(1,1,1,1); and four Ni(2,2) atoms to form NiTa4Co4Ni4 cuboctahedra that share corners with four equivalent Ta(1)Co4Ni8 cuboctahedra; corners with six equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; corners with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; edges with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ni(3)Ta4Co4Ni4 cuboctahedra. All Ni(1)-Ni(2,2) bond lengths are 2.51 Å. In the second Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted NiTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with ten Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with two equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with eight Co(1,1,1)Ta4Co2Ni6 cuboctahedra. There is one shorter (2.47 Å) and one longer (2.72 Å) Ni(2)-Ni(2) bond length. There is one shorter (2.46 Å) and one longer (2.66 Å) Ni(2)-Ni(3) bond length. In the third Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), two equivalent Co(1), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms to form distorted NiTa4Co2Ni6 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with four equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with ten Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with two equivalent Ni(2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four equivalent Co(1)Ta4Co2Ni6 cuboctahedra; edges with four equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(1)Ta4Co4Ni4 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with eight Co(1,1,1)Ta4Co2Ni6 cuboctahedra. There is one shorter (2.46 Å) and one longer (2.66 Å) Ni(2)-Ni(3) bond length. In the fourth Ni site, Ni(3) is bonded to two equivalent Ta(1); two equivalent Ta(2); four Co(1,1); and four Ni(2,2) atoms to form distorted NiTa4Co4Ni4 cuboctahedra that share corners with four equivalent Ta(2)Co4Ni8 cuboctahedra; corners with six equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; corners with eight Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with two equivalent Ta(2)Co4Ni8 cuboctahedra; edges with four equivalent Ta(1)Co4Ni8 cuboctahedra; edges with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; edges with eight Co(1,1,1,1)Ta4Co2Ni6 cuboctahedra; faces with two equivalent Ta(1)Co4Ni8 cuboctahedra; faces with two equivalent Ta(2)Co4Ni8 cuboctahedra; faces with two equivalent Ni(3)Ta4Co4Ni4 cuboctahedra; faces with four Co(1,1)Ta4Co2Ni6 cuboctahedra; faces with four Ni(2,2)Ta4Co2Ni6 cuboctahedra; and faces with six equivalent Ni(1)Ta4Co4Ni4 cuboctahedra.