FeGe2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(2), and three equivalent Ge(1) atoms.
FeGe2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two shorter (2.39 Å) and two longer (2.58 Å) Fe(1)-Ge(1) bond lengths. There are two shorter (2.41 Å) and two longer (2.51 Å) Fe(1)-Ge(2) bond lengths. In the second Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two shorter (2.40 Å) and two longer (2.46 Å) Fe(2)-Ge(1) bond lengths. There are two shorter (2.42 Å) and two longer (2.51 Å) Fe(2)-Ge(2) bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(1), and three equivalent Ge(2) atoms. There is one shorter (2.66 Å) and one longer (2.68 Å) Ge(1)-Ge(1) bond length. There are a spread of Ge(1)-Ge(2) bond distances ranging from 2.62-2.71 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Ge(2), and three equivalent Ge(1) atoms. There is one shorter (2.59 Å) and one longer (2.65 Å) Ge(2)-Ge(2) bond length.