Fe6Ge5 crystallizes in the monoclinic C2/m space group. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 11-coordinate geometry to one Fe(1), four equivalent Fe(2), one Ge(1), one Ge(2), and four equivalent Ge(3) atoms. In the second Fe site, Fe(2) is bonded in a 11-coordinate geometry to one Fe(2), one Fe(4), one Fe(5), two equivalent Fe(1), one Ge(1), one Ge(4), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the third Fe site, Fe(3) is bonded in a 7-coordinate geometry to two equivalent Fe(5), one Ge(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the fourth Fe site, Fe(4) is bonded in a 6-coordinate geometry to two equivalent Fe(2), two equivalent Fe(5), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to one Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to one Fe(3), one Fe(4), one Fe(5), two equivalent Fe(1), and two equivalent Fe(2) atoms. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to one Fe(3), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms.
Fe6Ge5 crystallizes in the monoclinic C2/m space group. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 11-coordinate geometry to one Fe(1), four equivalent Fe(2), one Ge(1), one Ge(2), and four equivalent Ge(3) atoms. The Fe(1)-Fe(1) bond length is 2.37 Å. There are two shorter (2.62 Å) and two longer (2.74 Å) Fe(1)-Fe(2) bond lengths. The Fe(1)-Ge(1) bond length is 2.89 Å. The Fe(1)-Ge(2) bond length is 2.41 Å. There are two shorter (2.47 Å) and two longer (2.52 Å) Fe(1)-Ge(3) bond lengths. In the second Fe site, Fe(2) is bonded in a 11-coordinate geometry to one Fe(2), one Fe(4), one Fe(5), two equivalent Fe(1), one Ge(1), one Ge(4), two equivalent Ge(2), and two equivalent Ge(3) atoms. The Fe(2)-Fe(2) bond length is 2.59 Å. The Fe(2)-Fe(4) bond length is 2.71 Å. The Fe(2)-Fe(5) bond length is 2.66 Å. The Fe(2)-Ge(1) bond length is 2.50 Å. The Fe(2)-Ge(4) bond length is 2.49 Å. There is one shorter (2.50 Å) and one longer (2.69 Å) Fe(2)-Ge(2) bond length. Both Fe(2)-Ge(3) bond lengths are 2.52 Å. In the third Fe site, Fe(3) is bonded in a 7-coordinate geometry to two equivalent Fe(5), one Ge(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. Both Fe(3)-Fe(5) bond lengths are 2.77 Å. The Fe(3)-Ge(4) bond length is 2.53 Å. There is one shorter (2.56 Å) and one longer (2.66 Å) Fe(3)-Ge(1) bond length. There is one shorter (2.45 Å) and one longer (2.47 Å) Fe(3)-Ge(2) bond length. Both Fe(3)-Ge(3) bond lengths are 2.42 Å. In the fourth Fe site, Fe(4) is bonded in a 6-coordinate geometry to two equivalent Fe(2), two equivalent Fe(5), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. Both Fe(4)-Fe(5) bond lengths are 2.47 Å. Both Fe(4)-Ge(1) bond lengths are 2.47 Å. Both Fe(4)-Ge(3) bond lengths are 2.46 Å. Both Fe(4)-Ge(4) bond lengths are 2.43 Å. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. Both Fe(5)-Ge(1) bond lengths are 2.51 Å. Both Fe(5)-Ge(3) bond lengths are 2.50 Å. Both Fe(5)-Ge(4) bond lengths are 2.44 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to one Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to one Fe(3), one Fe(4), one Fe(5), two equivalent Fe(1), and two equivalent Fe(2) atoms. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to one Fe(3), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms.