Dy18Mn(FeBi3)2 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent Dy sites. In the first Dy site, Dy(1) is bonded to two equivalent Mn(1) and two equivalent Bi(3) atoms to form distorted corner-sharing DyMn2Bi2 tetrahedra. In the second Dy site, Dy(2) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(2) atom. In the third Dy site, Dy(3) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(3) atom. In the fourth Dy site, Dy(4) is bonded in a 4-coordinate geometry to two equivalent Fe(1) and two equivalent Bi(2) atoms. In the fifth Dy site, Dy(5) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(1), and one Bi(3) atom. In the sixth Dy site, Dy(6) is bonded in a 5-coordinate geometry to one Mn(1) and four equivalent Bi(3) atoms. In the seventh Dy site, Dy(7) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(2) atoms. In the eighth Dy site, Dy(8) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the ninth Dy site, Dy(9) is bonded in a 5-coordinate geometry to one Fe(1) and four equivalent Bi(2) atoms. In the tenth Dy site, Dy(10) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. Mn(1) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(1), two equivalent Dy(8), and four equivalent Dy(5) atoms. Fe(1) is bonded in a 9-coordinate geometry to one Dy(10), one Dy(7), one Dy(9), two equivalent Dy(2), two equivalent Dy(3), and two equivalent Dy(4) atoms. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Dy(2), one Dy(3), one Dy(5), two equivalent Dy(10), two equivalent Dy(7), and two equivalent Dy(8) atoms. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(4), two equivalent Dy(7), and four equivalent Dy(9) atoms. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Dy(1), one Dy(3), one Dy(5), two equivalent Dy(10), two equivalent Dy(6), and two equivalent Dy(8) atoms.
Dy18Mn(FeBi3)2 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent Dy sites. In the first Dy site, Dy(1) is bonded to two equivalent Mn(1) and two equivalent Bi(3) atoms to form distorted corner-sharing DyMn2Bi2 tetrahedra. Both Dy(1)-Mn(1) bond lengths are 2.87 Å. Both Dy(1)-Bi(3) bond lengths are 3.28 Å. In the second Dy site, Dy(2) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(2) atom. Both Dy(2)-Fe(1) bond lengths are 2.86 Å. The Dy(2)-Bi(1) bond length is 3.29 Å. The Dy(2)-Bi(2) bond length is 3.29 Å. In the third Dy site, Dy(3) is bonded in a 4-coordinate geometry to two equivalent Fe(1), one Bi(1), and one Bi(3) atom. Both Dy(3)-Fe(1) bond lengths are 2.86 Å. The Dy(3)-Bi(1) bond length is 3.28 Å. The Dy(3)-Bi(3) bond length is 3.28 Å. In the fourth Dy site, Dy(4) is bonded in a 4-coordinate geometry to two equivalent Fe(1) and two equivalent Bi(2) atoms. Both Dy(4)-Fe(1) bond lengths are 2.86 Å. Both Dy(4)-Bi(2) bond lengths are 3.29 Å. In the fifth Dy site, Dy(5) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(1), and one Bi(3) atom. Both Dy(5)-Mn(1) bond lengths are 2.88 Å. The Dy(5)-Bi(1) bond length is 3.29 Å. The Dy(5)-Bi(3) bond length is 3.27 Å. In the sixth Dy site, Dy(6) is bonded in a 5-coordinate geometry to one Mn(1) and four equivalent Bi(3) atoms. The Dy(6)-Mn(1) bond length is 3.31 Å. All Dy(6)-Bi(3) bond lengths are 3.33 Å. In the seventh Dy site, Dy(7) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(2) atoms. The Dy(7)-Fe(1) bond length is 3.30 Å. Both Dy(7)-Bi(1) bond lengths are 3.31 Å. Both Dy(7)-Bi(2) bond lengths are 3.32 Å. In the eighth Dy site, Dy(8) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Dy(8)-Mn(1) bond length is 3.32 Å. Both Dy(8)-Bi(1) bond lengths are 3.31 Å. Both Dy(8)-Bi(3) bond lengths are 3.30 Å. In the ninth Dy site, Dy(9) is bonded in a 5-coordinate geometry to one Fe(1) and four equivalent Bi(2) atoms. The Dy(9)-Fe(1) bond length is 3.34 Å. All Dy(9)-Bi(2) bond lengths are 3.31 Å. In the tenth Dy site, Dy(10) is bonded in a 5-coordinate geometry to one Fe(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Dy(10)-Fe(1) bond length is 3.33 Å. Both Dy(10)-Bi(1) bond lengths are 3.31 Å. Both Dy(10)-Bi(3) bond lengths are 3.31 Å. Mn(1) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(1), two equivalent Dy(8), and four equivalent Dy(5) atoms. Fe(1) is bonded in a 9-coordinate geometry to one Dy(10), one Dy(7), one Dy(9), two equivalent Dy(2), two equivalent Dy(3), and two equivalent Dy(4) atoms. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Dy(2), one Dy(3), one Dy(5), two equivalent Dy(10), two equivalent Dy(7), and two equivalent Dy(8) atoms. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(4), two equivalent Dy(7), and four equivalent Dy(9) atoms. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Dy(1), one Dy(3), one Dy(5), two equivalent Dy(10), two equivalent Dy(6), and two equivalent Dy(8) atoms.