Fe3Ge2 crystallizes in the hexagonal P-6m2 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 Fe(1), three equivalent Fe(2), three equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded to six equivalent Fe(1), two equivalent Ge(1), and three equivalent Ge(2) atoms to form a mixture of distorted corner and face-sharing FeFe6Ge5 trigonal bipyramids. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Fe(2) and six equivalent Fe(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Fe(2) and six equivalent Fe(1) atoms.
Fe3Ge2 crystallizes in the hexagonal P-6m2 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 Fe(1), three equivalent Fe(2), three equivalent Ge(1), and three equivalent Ge(2) atoms. There is one shorter (2.41 Å) and one longer (2.50 Å) Fe(1)-Fe(1) bond length. All Fe(1)-Fe(2) bond lengths are 2.63 Å. All Fe(1)-Ge(1) bond lengths are 2.61 Å. All Fe(1)-Ge(2) bond lengths are 2.63 Å. In the second Fe site, Fe(2) is bonded to six equivalent Fe(1), two equivalent Ge(1), and three equivalent Ge(2) atoms to form a mixture of distorted corner and face-sharing FeFe6Ge5 trigonal bipyramids. Both Fe(2)-Ge(1) bond lengths are 2.46 Å. All Fe(2)-Ge(2) bond lengths are 2.31 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Fe(2) and six equivalent Fe(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Fe(2) and six equivalent Fe(1) atoms.