Ir3Ta is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded to twelve Ir(1,1) atoms to form TaIr12 cuboctahedra that share corners with six equivalent Ta(1)Ir12 cuboctahedra; corners with twelve equivalent Ir(1)Ta4Ir8 cuboctahedra; edges with eighteen Ir(1,1)Ta4Ir8 cuboctahedra; faces with eight equivalent Ta(1)Ir12 cuboctahedra; and faces with twelve Ir(1,1)Ta4Ir8 cuboctahedra. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ta(1) and eight Ir(1,1) atoms to form distorted IrTa4Ir8 cuboctahedra that share corners with four equivalent Ta(1)Ir12 cuboctahedra; corners with fourteen Ir(1,1)Ta4Ir8 cuboctahedra; edges with six equivalent Ta(1)Ir12 cuboctahedra; edges with twelve Ir(1,1)Ta4Ir8 cuboctahedra; faces with four equivalent Ta(1)Ir12 cuboctahedra; and faces with sixteen Ir(1,1)Ta4Ir8 cuboctahedra. In the second Ir site, Ir(1) is bonded to four equivalent Ta(1) and eight equivalent Ir(1) atoms to form distorted IrTa4Ir8 cuboctahedra that share corners with four equivalent Ta(1)Ir12 cuboctahedra; corners with fourteen Ir(1,1)Ta4Ir8 cuboctahedra; edges with six equivalent Ta(1)Ir12 cuboctahedra; edges with twelve equivalent Ir(1)Ta4Ir8 cuboctahedra; faces with four equivalent Ta(1)Ir12 cuboctahedra; and faces with sixteen Ir(1,1)Ta4Ir8 cuboctahedra.
Ir3Ta is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded to twelve Ir(1,1) atoms to form TaIr12 cuboctahedra that share corners with six equivalent Ta(1)Ir12 cuboctahedra; corners with twelve equivalent Ir(1)Ta4Ir8 cuboctahedra; edges with eighteen Ir(1,1)Ta4Ir8 cuboctahedra; faces with eight equivalent Ta(1)Ir12 cuboctahedra; and faces with twelve Ir(1,1)Ta4Ir8 cuboctahedra. There are six shorter (2.76 Å) and six longer (2.78 Å) Ta(1)-Ir(1,1) bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ta(1) and eight Ir(1,1) atoms to form distorted IrTa4Ir8 cuboctahedra that share corners with four equivalent Ta(1)Ir12 cuboctahedra; corners with fourteen Ir(1,1)Ta4Ir8 cuboctahedra; edges with six equivalent Ta(1)Ir12 cuboctahedra; edges with twelve Ir(1,1)Ta4Ir8 cuboctahedra; faces with four equivalent Ta(1)Ir12 cuboctahedra; and faces with sixteen Ir(1,1)Ta4Ir8 cuboctahedra. There are six shorter (2.73 Å) and two longer (2.82 Å) Ir(1)-Ir(1,1) bond lengths. In the second Ir site, Ir(1) is bonded to four equivalent Ta(1) and eight equivalent Ir(1) atoms to form distorted IrTa4Ir8 cuboctahedra that share corners with four equivalent Ta(1)Ir12 cuboctahedra; corners with fourteen Ir(1,1)Ta4Ir8 cuboctahedra; edges with six equivalent Ta(1)Ir12 cuboctahedra; edges with twelve equivalent Ir(1)Ta4Ir8 cuboctahedra; faces with four equivalent Ta(1)Ir12 cuboctahedra; and faces with sixteen Ir(1,1)Ta4Ir8 cuboctahedra.