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ThDy is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Th is bonded in a body-centered cubic geometry to eight equivalent Dy atoms. All Th–Dy bond lengths are 3.47 Å. Dy is bonded in a body-centered cubic geometry to eight equivalent Th atoms.
Th3Dy is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Th is bonded to eight equivalent Th and four equivalent Dy atoms to form ThDy4Th8 cuboctahedra that share corners with twelve equivalent ThDy4Th8 cuboctahedra, edges with eight equivalent DyTh12 cuboctahedra, edges with sixteen equivalent ThDy4Th8 cuboctahedra, faces with four equivalent DyTh12 cuboctahedra, and faces with fourteen equivalent ThDy4Th8 cuboctahedra. All Th–Th bond lengths are 3.56 Å. All Th–Dy bond lengths are 3.56 Å. Dy is bonded to twelve equivalent Th atoms to form DyTh12 cuboctahedra that share corners with twelve equivalent DyTh12 cuboctahedra, edges with twenty-four equivalent ThDy4Th8 cuboctahedra, faces with six equivalent DyTh12 cuboctahedra, and faces with twelve equivalent ThDy4Th8 cuboctahedra.
Th2Dy is alpha La-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Th is bonded to nine equivalent Th and three equivalent Dy atoms to form ThDy3Th9 cuboctahedra that share corners with three equivalent DyDy6Th6 cuboctahedra, corners with nine equivalent ThDy3Th9 cuboctahedra, edges with nine equivalent DyDy6Th6 cuboctahedra, edges with fifteen equivalent ThDy3Th9 cuboctahedra, faces with six equivalent DyDy6Th6 cuboctahedra, and faces with twelve equivalent ThDy3Th9 cuboctahedra. There are three shorter (3.51 Å) and six longer (3.56 Å) Th–Th bond lengths. All Th–Dy bond lengths are 3.59 Å. Dy is bonded to six equivalent Th and six equivalent Dy atoms to form DyDy6Th6 cuboctahedra that share corners with six equivalent ThDy3Th9 cuboctahedra, corners with six equivalent DyDy6Th6 cuboctahedra, edges with six equivalent DyDy6Th6 cuboctahedra, edges with eighteen equivalent ThDy3Th9 cuboctahedra, faces with six equivalent DyDy6Th6 cuboctahedra, and faces with twelve equivalent ThDy3Th9 cuboctahedra. All Dy–Dy bond lengths are 3.56 Å.