HfAs2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Hf(1) is bonded in a 9-coordinate geometry to four equivalent As(2) and five equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Hf(1), two equivalent As(1), and two equivalent As(2) atoms. In the second As site, As(1) is bonded in a 5-coordinate geometry to five equivalent Hf(1) and two equivalent As(2) atoms.
HfAs2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Hf(1) is bonded in a 9-coordinate geometry to four equivalent As(2) and five equivalent As(1) atoms. There are a spread of Hf(1)-As(2) bond distances ranging from 2.75-2.87 Å. There are a spread of Hf(1)-As(1) bond distances ranging from 2.79-2.95 Å. There are two inequivalent As sites. In the first As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Hf(1), two equivalent As(1), and two equivalent As(2) atoms. Both As(2)-As(1) bond lengths are 2.91 Å. Both As(2)-As(2) bond lengths are 2.56 Å. In the second As site, As(1) is bonded in a 5-coordinate geometry to five equivalent Hf(1) and two equivalent As(2) atoms.