Tm(FeGe)6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to four equivalent Fe(2), four equivalent Fe(3), four equivalent Fe(4), one Ge(1), one Ge(6), two equivalent Ge(3), two equivalent Ge(5), and two equivalent Ge(8) atoms to form distorted TmFe12Ge8 hexagonal bipyramids that share corners with four equivalent Tm(1)Fe12Ge8 hexagonal bipyramids, faces with eight equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, faces with two equivalent Tm(1)Fe12Ge8 hexagonal bipyramids, and faces with two equivalent Tm(2)Fe12Ge8 hexagonal bipyramids. In the second Tm site, Tm(2) is bonded to four equivalent Fe(1), eight equivalent Fe(4), two equivalent Ge(3), two equivalent Ge(7), and four equivalent Ge(1) atoms to form distorted face-sharing TmFe12Ge8 hexagonal bipyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Tm(2), four equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(7) atoms. In the second Fe site, Fe(2) is bonded to two equivalent Tm(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Ge(5), two equivalent Ge(6), and two equivalent Ge(8) atoms to form distorted FeTm2Fe4Ge6 cuboctahedra that share corners with four equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, edges with two equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, faces with four equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, and faces with four equivalent Tm(1)Fe12Ge8 hexagonal bipyramids. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Tm(1), two equivalent Fe(2), two equivalent Fe(4), one Ge(3), one Ge(4), one Ge(5), one Ge(6), and two equivalent Ge(8) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Tm(1), one Tm(2), one Fe(1), one Fe(3), two equivalent Fe(4), one Ge(1), one Ge(2), one Ge(3), one Ge(4), one Ge(7), and one Ge(8) atom. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Fe(1), and four equivalent Fe(4) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Fe(1) and four equivalent Fe(4) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(1), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Ge site, Ge(4) is bonded in a 6-coordinate geometry to two equivalent Fe(3) and four equivalent Fe(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the sixth Ge site, Ge(6) is bonded in a 7-coordinate geometry to one Tm(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to one Tm(2), two equivalent Fe(1), four equivalent Fe(4), and one Ge(7) atom. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to one Tm(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and one Ge(8) atom.
Tm(FeGe)6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to four equivalent Fe(2), four equivalent Fe(3), four equivalent Fe(4), one Ge(1), one Ge(6), two equivalent Ge(3), two equivalent Ge(5), and two equivalent Ge(8) atoms to form distorted TmFe12Ge8 hexagonal bipyramids that share corners with four equivalent Tm(1)Fe12Ge8 hexagonal bipyramids, faces with eight equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, faces with two equivalent Tm(1)Fe12Ge8 hexagonal bipyramids, and faces with two equivalent Tm(2)Fe12Ge8 hexagonal bipyramids. All Tm(1)-Fe(2) bond lengths are 3.24 Å. All Tm(1)-Fe(3) bond lengths are 3.27 Å. All Tm(1)-Fe(4) bond lengths are 3.28 Å. The Tm(1)-Ge(1) bond length is 2.98 Å. The Tm(1)-Ge(6) bond length is 2.97 Å. Both Tm(1)-Ge(3) bond lengths are 2.96 Å. Both Tm(1)-Ge(5) bond lengths are 2.96 Å. Both Tm(1)-Ge(8) bond lengths are 2.81 Å. In the second Tm site, Tm(2) is bonded to four equivalent Fe(1), eight equivalent Fe(4), two equivalent Ge(3), two equivalent Ge(7), and four equivalent Ge(1) atoms to form distorted face-sharing TmFe12Ge8 hexagonal bipyramids. All Tm(2)-Fe(1) bond lengths are 3.27 Å. All Tm(2)-Fe(4) bond lengths are 3.26 Å. Both Tm(2)-Ge(3) bond lengths are 2.98 Å. Both Tm(2)-Ge(7) bond lengths are 2.80 Å. All Tm(2)-Ge(1) bond lengths are 2.96 Å. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Tm(2), four equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(7) atoms. All Fe(1)-Fe(4) bond lengths are 2.56 Å. Both Fe(1)-Ge(1) bond lengths are 2.50 Å. Both Fe(1)-Ge(2) bond lengths are 2.50 Å. Both Fe(1)-Ge(7) bond lengths are 2.68 Å. In the second Fe site, Fe(2) is bonded to two equivalent Tm(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Ge(5), two equivalent Ge(6), and two equivalent Ge(8) atoms to form distorted FeTm2Fe4Ge6 cuboctahedra that share corners with four equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, edges with two equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, faces with four equivalent Fe(2)Tm2Fe4Ge6 cuboctahedra, and faces with four equivalent Tm(1)Fe12Ge8 hexagonal bipyramids. Both Fe(2)-Fe(2) bond lengths are 2.57 Å. Both Fe(2)-Fe(3) bond lengths are 2.56 Å. Both Fe(2)-Ge(5) bond lengths are 2.50 Å. Both Fe(2)-Ge(6) bond lengths are 2.52 Å. Both Fe(2)-Ge(8) bond lengths are 2.68 Å. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Tm(1), two equivalent Fe(2), two equivalent Fe(4), one Ge(3), one Ge(4), one Ge(5), one Ge(6), and two equivalent Ge(8) atoms. Both Fe(3)-Fe(4) bond lengths are 2.55 Å. The Fe(3)-Ge(3) bond length is 2.49 Å. The Fe(3)-Ge(4) bond length is 2.52 Å. The Fe(3)-Ge(5) bond length is 2.52 Å. The Fe(3)-Ge(6) bond length is 2.48 Å. Both Fe(3)-Ge(8) bond lengths are 2.68 Å. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Tm(1), one Tm(2), one Fe(1), one Fe(3), two equivalent Fe(4), one Ge(1), one Ge(2), one Ge(3), one Ge(4), one Ge(7), and one Ge(8) atom. There is one shorter (2.56 Å) and one longer (2.57 Å) Fe(4)-Fe(4) bond length. The Fe(4)-Ge(1) bond length is 2.51 Å. The Fe(4)-Ge(2) bond length is 2.51 Å. The Fe(4)-Ge(3) bond length is 2.52 Å. The Fe(4)-Ge(4) bond length is 2.51 Å. The Fe(4)-Ge(7) bond length is 2.67 Å. The Fe(4)-Ge(8) bond length is 2.67 Å. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Fe(1), and four equivalent Fe(4) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Fe(1) and four equivalent Fe(4) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(1), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Ge site, Ge(4) is bonded in a 6-coordinate geometry to two equivalent Fe(3) and four equivalent Fe(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the sixth Ge site, Ge(6) is bonded in a 7-coordinate geometry to one Tm(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to one Tm(2), two equivalent Fe(1), four equivalent Fe(4), and one Ge(7) atom. The Ge(7)-Ge(7) bond length is 2.50 Å. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to one Tm(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and one Ge(8) atom. The Ge(8)-Ge(8) bond length is 2.49 Å.