FeIr3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Fe(1) is bonded to twelve equivalent Ir(1) atoms to form FeIr12 cuboctahedra that share corners with six equivalent Fe(1)Ir12 cuboctahedra, corners with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra, edges with eighteen equivalent Ir(1)Fe4Ir8 cuboctahedra, faces with eight equivalent Fe(1)Ir12 cuboctahedra, and faces with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra. Ir(1) is bonded to four equivalent Fe(1) and eight equivalent Ir(1) atoms to form distorted IrFe4Ir8 cuboctahedra that share corners with four equivalent Fe(1)Ir12 cuboctahedra, corners with fourteen equivalent Ir(1)Fe4Ir8 cuboctahedra, edges with six equivalent Fe(1)Ir12 cuboctahedra, edges with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra, faces with four equivalent Fe(1)Ir12 cuboctahedra, and faces with sixteen equivalent Ir(1)Fe4Ir8 cuboctahedra.
FeIr3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Fe(1) is bonded to twelve equivalent Ir(1) atoms to form FeIr12 cuboctahedra that share corners with six equivalent Fe(1)Ir12 cuboctahedra, corners with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra, edges with eighteen equivalent Ir(1)Fe4Ir8 cuboctahedra, faces with eight equivalent Fe(1)Ir12 cuboctahedra, and faces with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra. There are six shorter (2.64 Å) and six longer (2.70 Å) Fe(1)-Ir(1) bond lengths. Ir(1) is bonded to four equivalent Fe(1) and eight equivalent Ir(1) atoms to form distorted IrFe4Ir8 cuboctahedra that share corners with four equivalent Fe(1)Ir12 cuboctahedra, corners with fourteen equivalent Ir(1)Fe4Ir8 cuboctahedra, edges with six equivalent Fe(1)Ir12 cuboctahedra, edges with twelve equivalent Ir(1)Fe4Ir8 cuboctahedra, faces with four equivalent Fe(1)Ir12 cuboctahedra, and faces with sixteen equivalent Ir(1)Fe4Ir8 cuboctahedra. There are a spread of Ir(1)-Ir(1) bond distances ranging from 2.65-2.76 Å.