Ho4FeSn8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(3) atoms. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(6), two equivalent Sn(8), and four equivalent Sn(4) atoms. In the third Ho site, Ho(3) is bonded in a 14-coordinate geometry to four equivalent Fe(1), two equivalent Sn(4), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(1) atoms. In the fourth Ho site, Ho(4) is bonded in a 10-coordinate geometry to two equivalent Sn(3), two equivalent Sn(6), two equivalent Sn(8), and four equivalent Sn(2) atoms. Fe(1) is bonded in a 5-coordinate geometry to four equivalent Ho(3), one Sn(1), two equivalent Sn(5), and two equivalent Sn(7) atoms. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(3), one Fe(1), and two equivalent Sn(4) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Ho(1), four equivalent Ho(4), and two equivalent Sn(3) atoms. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Ho(4), four equivalent Ho(1), and two equivalent Sn(2) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Ho(3), four equivalent Ho(2), and two equivalent Sn(1) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Ho(1), two equivalent Ho(3), two equivalent Fe(1), and four equivalent Sn(7) atoms. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Ho(2), two equivalent Ho(4), and four equivalent Sn(8) atoms. In the seventh Sn site, Sn(7) is bonded in a 10-coordinate geometry to two equivalent Ho(1), two equivalent Ho(3), two equivalent Fe(1), and four equivalent Sn(5) atoms. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to two equivalent Ho(2), two equivalent Ho(4), and four equivalent Sn(6) atoms.
Ho4FeSn8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(3) atoms. Both Ho(1)-Sn(2) bond lengths are 3.48 Å. Both Ho(1)-Sn(5) bond lengths are 3.22 Å. Both Ho(1)-Sn(7) bond lengths are 3.23 Å. All Ho(1)-Sn(3) bond lengths are 3.19 Å. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to two equivalent Sn(1), two equivalent Sn(6), two equivalent Sn(8), and four equivalent Sn(4) atoms. Both Ho(2)-Sn(1) bond lengths are 3.32 Å. Both Ho(2)-Sn(6) bond lengths are 3.31 Å. Both Ho(2)-Sn(8) bond lengths are 3.33 Å. All Ho(2)-Sn(4) bond lengths are 3.19 Å. In the third Ho site, Ho(3) is bonded in a 14-coordinate geometry to four equivalent Fe(1), two equivalent Sn(4), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(1) atoms. All Ho(3)-Fe(1) bond lengths are 3.48 Å. Both Ho(3)-Sn(4) bond lengths are 3.70 Å. Both Ho(3)-Sn(5) bond lengths are 3.46 Å. Both Ho(3)-Sn(7) bond lengths are 3.45 Å. All Ho(3)-Sn(1) bond lengths are 3.30 Å. In the fourth Ho site, Ho(4) is bonded in a 10-coordinate geometry to two equivalent Sn(3), two equivalent Sn(6), two equivalent Sn(8), and four equivalent Sn(2) atoms. Both Ho(4)-Sn(3) bond lengths are 3.52 Å. Both Ho(4)-Sn(6) bond lengths are 3.35 Å. Both Ho(4)-Sn(8) bond lengths are 3.33 Å. All Ho(4)-Sn(2) bond lengths are 3.20 Å. Fe(1) is bonded in a 5-coordinate geometry to four equivalent Ho(3), one Sn(1), two equivalent Sn(5), and two equivalent Sn(7) atoms. The Fe(1)-Sn(1) bond length is 2.47 Å. Both Fe(1)-Sn(5) bond lengths are 2.51 Å. Both Fe(1)-Sn(7) bond lengths are 2.50 Å. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(3), one Fe(1), and two equivalent Sn(4) atoms. Both Sn(1)-Sn(4) bond lengths are 2.97 Å. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Ho(1), four equivalent Ho(4), and two equivalent Sn(3) atoms. Both Sn(2)-Sn(3) bond lengths are 3.08 Å. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Ho(4), four equivalent Ho(1), and two equivalent Sn(2) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Ho(3), four equivalent Ho(2), and two equivalent Sn(1) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Ho(1), two equivalent Ho(3), two equivalent Fe(1), and four equivalent Sn(7) atoms. All Sn(5)-Sn(7) bond lengths are 3.15 Å. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Ho(2), two equivalent Ho(4), and four equivalent Sn(8) atoms. All Sn(6)-Sn(8) bond lengths are 3.15 Å. In the seventh Sn site, Sn(7) is bonded in a 10-coordinate geometry to two equivalent Ho(1), two equivalent Ho(3), two equivalent Fe(1), and four equivalent Sn(5) atoms. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to two equivalent Ho(2), two equivalent Ho(4), and four equivalent Sn(6) atoms.