FeRhAs crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 11-coordinate geometry to two equivalent Rh(1), four equivalent Rh(2), one As(2), and four equivalent As(1) atoms. In the second Fe site, Fe(2) is bonded in a 11-coordinate geometry to two equivalent Rh(1), four equivalent Rh(2), one As(2), and four equivalent As(1) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 10-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), two equivalent As(1), and two equivalent As(2) atoms. In the second Rh site, Rh(2) is bonded in a 10-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), two equivalent As(1), and two equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), one Rh(1), and two equivalent Rh(2) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Rh(1), and four equivalent Rh(2) atoms.
FeRhAs crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 11-coordinate geometry to two equivalent Rh(1), four equivalent Rh(2), one As(2), and four equivalent As(1) atoms. Both Fe(1)-Rh(1) bond lengths are 2.85 Å. All Fe(1)-Rh(2) bond lengths are 2.89 Å. The Fe(1)-As(2) bond length is 2.52 Å. All Fe(1)-As(1) bond lengths are 2.68 Å. In the second Fe site, Fe(2) is bonded in a 11-coordinate geometry to two equivalent Rh(1), four equivalent Rh(2), one As(2), and four equivalent As(1) atoms. Both Fe(2)-Rh(1) bond lengths are 2.89 Å. There are two shorter (2.84 Å) and two longer (2.89 Å) Fe(2)-Rh(2) bond lengths. The Fe(2)-As(2) bond length is 2.52 Å. There are two shorter (2.68 Å) and two longer (2.69 Å) Fe(2)-As(1) bond lengths. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 10-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), two equivalent As(1), and two equivalent As(2) atoms. Both Rh(1)-As(1) bond lengths are 2.37 Å. Both Rh(1)-As(2) bond lengths are 2.49 Å. In the second Rh site, Rh(2) is bonded in a 10-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), two equivalent As(1), and two equivalent As(2) atoms. Both Rh(2)-As(1) bond lengths are 2.37 Å. Both Rh(2)-As(2) bond lengths are 2.49 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), four equivalent Fe(2), one Rh(1), and two equivalent Rh(2) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Rh(1), and four equivalent Rh(2) atoms.