FeSiGe 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 Si(1) atoms. In the second Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Si(1) atoms. 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 Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), three equivalent Ge(1), and two equivalent Si(1) atoms.
FeSiGe 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 Si(1) atoms. There are two shorter (2.40 Å) and two longer (2.43 Å) Fe(1)-Ge(1) bond lengths. There are two shorter (2.38 Å) and two longer (2.46 Å) Fe(1)-Si(1) bond lengths. In the second Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Si(1) atoms. There are two shorter (2.41 Å) and two longer (2.49 Å) Fe(2)-Ge(1) bond lengths. There are two shorter (2.37 Å) and two longer (2.50 Å) Fe(2)-Si(1) bond lengths. 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 Si(1) atoms. There is one shorter (2.60 Å) and one longer (2.64 Å) Ge(1)-Ge(1) bond length. There are a spread of Ge(1)-Si(1) bond distances ranging from 2.54-2.68 Å. Si(1) is bonded in a 9-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), three equivalent Ge(1), and two equivalent Si(1) atoms. There is one shorter (2.53 Å) and one longer (2.57 Å) Si(1)-Si(1) bond length.