SmFeGe2 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 14-coordinate geometry to four equivalent Fe(1), four equivalent Ge(2), and six equivalent Ge(1) atoms. Fe(1) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Ge(1), and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Sm(1), one Fe(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent Fe(1) atoms.
SmFeGe2 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 14-coordinate geometry to four equivalent Fe(1), four equivalent Ge(2), and six equivalent Ge(1) atoms. All Sm(1)-Fe(1) bond lengths are 3.29 Å. There are two shorter (3.16 Å) and two longer (3.21 Å) Sm(1)-Ge(2) bond lengths. There are four shorter (3.20 Å) and two longer (3.28 Å) Sm(1)-Ge(1) bond lengths. Fe(1) is bonded in a 5-coordinate geometry to four equivalent Sm(1), one Ge(1), and four equivalent Ge(2) atoms. The Fe(1)-Ge(1) bond length is 2.30 Å. There are two shorter (2.39 Å) and two longer (2.40 Å) Fe(1)-Ge(2) bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Sm(1), one Fe(1), and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.61 Å. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent Sm(1) and four equivalent Fe(1) atoms.