Nd4MnSn8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Nd sites. In the first Nd site, Nd(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 Nd site, Nd(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 Nd site, Nd(3) is bonded in a 14-coordinate geometry to four equivalent Mn(1), two equivalent Sn(4), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(1) atoms. In the fourth Nd site, Nd(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. Mn(1) is bonded in a 5-coordinate geometry to four equivalent Nd(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 Nd(2), four equivalent Nd(3), one Mn(1), and two equivalent Sn(4) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Nd(1), four equivalent Nd(4), and two equivalent Sn(3) atoms. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Nd(4), four equivalent Nd(1), and two equivalent Sn(2) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Nd(3), four equivalent Nd(2), and two equivalent Sn(1) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent Mn(1), and four equivalent Sn(7) atoms. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Nd(2), two equivalent Nd(4), and four equivalent Sn(8) atoms. In the seventh Sn site, Sn(7) is bonded in a 4-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent Mn(1), and four equivalent Sn(5) atoms. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to two equivalent Nd(2), two equivalent Nd(4), and four equivalent Sn(6) atoms.
Nd4MnSn8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Nd sites. In the first Nd site, Nd(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 Nd(1)-Sn(2) bond lengths are 3.56 Å. Both Nd(1)-Sn(5) bond lengths are 3.33 Å. Both Nd(1)-Sn(7) bond lengths are 3.27 Å. All Nd(1)-Sn(3) bond lengths are 3.27 Å. In the second Nd site, Nd(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 Nd(2)-Sn(1) bond lengths are 3.36 Å. Both Nd(2)-Sn(6) bond lengths are 3.38 Å. Both Nd(2)-Sn(8) bond lengths are 3.42 Å. All Nd(2)-Sn(4) bond lengths are 3.24 Å. In the third Nd site, Nd(3) is bonded in a 14-coordinate geometry to four equivalent Mn(1), two equivalent Sn(4), two equivalent Sn(5), two equivalent Sn(7), and four equivalent Sn(1) atoms. All Nd(3)-Mn(1) bond lengths are 3.52 Å. Both Nd(3)-Sn(4) bond lengths are 3.85 Å. Both Nd(3)-Sn(5) bond lengths are 3.61 Å. Both Nd(3)-Sn(7) bond lengths are 3.67 Å. All Nd(3)-Sn(1) bond lengths are 3.39 Å. In the fourth Nd site, Nd(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 Nd(4)-Sn(3) bond lengths are 3.55 Å. Both Nd(4)-Sn(6) bond lengths are 3.44 Å. Both Nd(4)-Sn(8) bond lengths are 3.40 Å. All Nd(4)-Sn(2) bond lengths are 3.27 Å. Mn(1) is bonded in a 5-coordinate geometry to four equivalent Nd(3), one Sn(1), two equivalent Sn(5), and two equivalent Sn(7) atoms. The Mn(1)-Sn(1) bond length is 2.58 Å. Both Mn(1)-Sn(5) bond lengths are 2.66 Å. Both Mn(1)-Sn(7) bond lengths are 2.65 Å. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(3), one Mn(1), and two equivalent Sn(4) atoms. Both Sn(1)-Sn(4) bond lengths are 2.99 Å. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Nd(1), four equivalent Nd(4), and two equivalent Sn(3) atoms. Both Sn(2)-Sn(3) bond lengths are 3.05 Å. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Nd(4), four equivalent Nd(1), and two equivalent Sn(2) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to two equivalent Nd(3), four equivalent Nd(2), and two equivalent Sn(1) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent Mn(1), and four equivalent Sn(7) atoms. All Sn(5)-Sn(7) bond lengths are 3.20 Å. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Nd(2), two equivalent Nd(4), and four equivalent Sn(8) atoms. All Sn(6)-Sn(8) bond lengths are 3.21 Å. In the seventh Sn site, Sn(7) is bonded in a 4-coordinate geometry to two equivalent Nd(1), two equivalent Nd(3), two equivalent Mn(1), and four equivalent Sn(5) atoms. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to two equivalent Nd(2), two equivalent Nd(4), and four equivalent Sn(6) atoms.