Tm9(FeGe)10 crystallizes in the orthorhombic Immm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 14-coordinate geometry to four equivalent Fe(1), eight equivalent Fe(2), and two equivalent Ge(3) atoms. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to four equivalent Fe(2), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. In the third Tm site, Tm(3) is bonded in a 7-coordinate geometry to one Fe(1), four equivalent Fe(2), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. In the fourth Tm site, Tm(4) is bonded in a 7-coordinate geometry to four equivalent Fe(2), one Ge(2), one Ge(3), two equivalent Ge(1), and three equivalent Ge(4) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 10-coordinate geometry to one Tm(3), two equivalent Tm(1), one Fe(1), four equivalent Fe(2), and two equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Tm(1), one Tm(2), one Tm(3), two equivalent Tm(4), one Fe(1), two equivalent Fe(2), one Ge(2), one 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 10-coordinate geometry to two equivalent Tm(2), two equivalent Tm(3), four equivalent Tm(4), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 10-coordinate geometry to two equivalent Tm(2), two equivalent Tm(4), two equivalent Fe(1), and four equivalent Fe(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(3), two equivalent Tm(4), and four equivalent Fe(2) atoms. In the fourth Ge site, Ge(4) is bonded in a 9-coordinate geometry to one Tm(2), one Tm(3), three equivalent Tm(4), and four equivalent Fe(2) atoms.
Tm9(FeGe)10 crystallizes in the orthorhombic Immm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 14-coordinate geometry to four equivalent Fe(1), eight equivalent Fe(2), and two equivalent Ge(3) atoms. All Tm(1)-Fe(1) bond lengths are 3.00 Å. All Tm(1)-Fe(2) bond lengths are 3.19 Å. Both Tm(1)-Ge(3) bond lengths are 2.94 Å. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to four equivalent Fe(2), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. All Tm(2)-Fe(2) bond lengths are 3.15 Å. Both Tm(2)-Ge(1) bond lengths are 3.18 Å. Both Tm(2)-Ge(2) bond lengths are 3.07 Å. Both Tm(2)-Ge(4) bond lengths are 2.84 Å. In the third Tm site, Tm(3) is bonded in a 7-coordinate geometry to one Fe(1), four equivalent Fe(2), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. The Tm(3)-Fe(1) bond length is 2.95 Å. All Tm(3)-Fe(2) bond lengths are 3.14 Å. Both Tm(3)-Ge(1) bond lengths are 3.05 Å. Both Tm(3)-Ge(3) bond lengths are 3.00 Å. Both Tm(3)-Ge(4) bond lengths are 2.80 Å. In the fourth Tm site, Tm(4) is bonded in a 7-coordinate geometry to four equivalent Fe(2), one Ge(2), one Ge(3), two equivalent Ge(1), and three equivalent Ge(4) atoms. There are two shorter (3.09 Å) and two longer (3.24 Å) Tm(4)-Fe(2) bond lengths. The Tm(4)-Ge(2) bond length is 3.07 Å. The Tm(4)-Ge(3) bond length is 2.90 Å. Both Tm(4)-Ge(1) bond lengths are 3.04 Å. There is one shorter (2.95 Å) and two longer (2.97 Å) Tm(4)-Ge(4) bond lengths. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 10-coordinate geometry to one Tm(3), two equivalent Tm(1), one Fe(1), four equivalent Fe(2), and two equivalent Ge(2) atoms. The Fe(1)-Fe(1) bond length is 2.63 Å. All Fe(1)-Fe(2) bond lengths are 2.47 Å. Both Fe(1)-Ge(2) bond lengths are 2.64 Å. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Tm(1), one Tm(2), one Tm(3), two equivalent Tm(4), one Fe(1), two equivalent Fe(2), one Ge(2), one Ge(3), and two equivalent Ge(4) atoms. There is one shorter (2.64 Å) and one longer (2.75 Å) Fe(2)-Fe(2) bond length. The Fe(2)-Ge(2) bond length is 2.55 Å. The Fe(2)-Ge(3) bond length is 2.49 Å. There is one shorter (2.47 Å) and one longer (2.56 Å) Fe(2)-Ge(4) bond length. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to two equivalent Tm(2), two equivalent Tm(3), four equivalent Tm(4), and two equivalent Ge(1) atoms. There is one shorter (2.69 Å) and one longer (2.70 Å) Ge(1)-Ge(1) bond length. In the second Ge site, Ge(2) is bonded in a 10-coordinate geometry to two equivalent Tm(2), two equivalent Tm(4), two equivalent Fe(1), and four equivalent Fe(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(3), two equivalent Tm(4), and four equivalent Fe(2) atoms. In the fourth Ge site, Ge(4) is bonded in a 9-coordinate geometry to one Tm(2), one Tm(3), three equivalent Tm(4), and four equivalent Fe(2) atoms.