YbEr3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Yb(1) is bonded to four equivalent Er(2) and eight equivalent Er(1) atoms to form YbEr12 cuboctahedra that share corners with four equivalent Yb(1)Er12 cuboctahedra, corners with eight equivalent Er(2)Yb4Er8 cuboctahedra, edges with eight equivalent Yb(1)Er12 cuboctahedra, edges with sixteen equivalent Er(1)Yb4Er8 cuboctahedra, faces with four equivalent Yb(1)Er12 cuboctahedra, faces with six equivalent Er(2)Yb4Er8 cuboctahedra, and faces with eight equivalent Er(1)Yb4Er8 cuboctahedra. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Yb(1), four equivalent Er(1), and four equivalent Er(2) atoms to form ErYb4Er8 cuboctahedra that share corners with twelve equivalent Er(1)Yb4Er8 cuboctahedra, edges with eight equivalent Yb(1)Er12 cuboctahedra, edges with eight equivalent Er(1)Yb4Er8 cuboctahedra, edges with eight equivalent Er(2)Yb4Er8 cuboctahedra, faces with four equivalent Yb(1)Er12 cuboctahedra, faces with four equivalent Er(2)Yb4Er8 cuboctahedra, and faces with ten equivalent Er(1)Yb4Er8 cuboctahedra. In the second Er site, Er(2) is bonded to four equivalent Yb(1) and eight equivalent Er(1) atoms to form ErYb4Er8 cuboctahedra that share corners with four equivalent Er(2)Yb4Er8 cuboctahedra, corners with eight equivalent Yb(1)Er12 cuboctahedra, edges with eight equivalent Er(2)Yb4Er8 cuboctahedra, edges with sixteen equivalent Er(1)Yb4Er8 cuboctahedra, faces with four equivalent Er(2)Yb4Er8 cuboctahedra, faces with six equivalent Yb(1)Er12 cuboctahedra, and faces with eight equivalent Er(1)Yb4Er8 cuboctahedra.
YbEr3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Yb(1) is bonded to four equivalent Er(2) and eight equivalent Er(1) atoms to form YbEr12 cuboctahedra that share corners with four equivalent Yb(1)Er12 cuboctahedra, corners with eight equivalent Er(2)Yb4Er8 cuboctahedra, edges with eight equivalent Yb(1)Er12 cuboctahedra, edges with sixteen equivalent Er(1)Yb4Er8 cuboctahedra, faces with four equivalent Yb(1)Er12 cuboctahedra, faces with six equivalent Er(2)Yb4Er8 cuboctahedra, and faces with eight equivalent Er(1)Yb4Er8 cuboctahedra. All Yb(1)-Er(2) bond lengths are 3.55 Å. All Yb(1)-Er(1) bond lengths are 3.57 Å. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Yb(1), four equivalent Er(1), and four equivalent Er(2) atoms to form ErYb4Er8 cuboctahedra that share corners with twelve equivalent Er(1)Yb4Er8 cuboctahedra, edges with eight equivalent Yb(1)Er12 cuboctahedra, edges with eight equivalent Er(1)Yb4Er8 cuboctahedra, edges with eight equivalent Er(2)Yb4Er8 cuboctahedra, faces with four equivalent Yb(1)Er12 cuboctahedra, faces with four equivalent Er(2)Yb4Er8 cuboctahedra, and faces with ten equivalent Er(1)Yb4Er8 cuboctahedra. All Er(1)-Er(1) bond lengths are 3.55 Å. All Er(1)-Er(2) bond lengths are 3.57 Å. In the second Er site, Er(2) is bonded to four equivalent Yb(1) and eight equivalent Er(1) atoms to form ErYb4Er8 cuboctahedra that share corners with four equivalent Er(2)Yb4Er8 cuboctahedra, corners with eight equivalent Yb(1)Er12 cuboctahedra, edges with eight equivalent Er(2)Yb4Er8 cuboctahedra, edges with sixteen equivalent Er(1)Yb4Er8 cuboctahedra, faces with four equivalent Er(2)Yb4Er8 cuboctahedra, faces with six equivalent Yb(1)Er12 cuboctahedra, and faces with eight equivalent Er(1)Yb4Er8 cuboctahedra.