Y2Ni7Sn3 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the orthorhombic Cmce space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to one Ni(4), two equivalent Ni(3), two equivalent Ni(5), six equivalent Ni(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(4), two equivalent Sn(2), and four equivalent Sn(3) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Y(1), four equivalent Y(2), one Ni(2), two equivalent Sn(2), and two equivalent Sn(3) atoms. In the second Ni site, Ni(5) is bonded in a 12-coordinate geometry to two equivalent Y(1), one Ni(2), two equivalent Ni(1), four equivalent Ni(3), one Sn(3), and two equivalent Sn(1) atoms. In the third Ni site, Ni(1) is bonded in a 10-coordinate geometry to three equivalent Y(1), one Ni(1), one Ni(2), one Ni(3), one Ni(5), one Sn(2), and two equivalent Sn(1) atoms. In the fourth Ni site, Ni(2) is bonded in a 11-coordinate geometry to two equivalent Y(2), one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(3), one Sn(3), and two equivalent Sn(2) atoms. In the fifth Ni site, Ni(3) is bonded in a 11-coordinate geometry to one Y(1), one Y(2), one Ni(1), one Ni(2), one Ni(3), two equivalent Ni(5), one Sn(1), one Sn(2), and two equivalent Sn(3) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 12-coordinate geometry to four equivalent Y(1), two equivalent Ni(3), two equivalent Ni(5), and four equivalent Ni(1) atoms. In the second Sn site, Sn(2) is bonded to two equivalent Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), and two equivalent Ni(4) atoms to form a mixture of distorted corner and face-sharing SnY4Ni8 cuboctahedra. In the third Sn site, Sn(3) is bonded in a 12-coordinate geometry to four equivalent Y(2), one Ni(2), one Ni(5), two equivalent Ni(4), and four equivalent Ni(3) atoms.
Y2Ni7Sn3 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the orthorhombic Cmce space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to one Ni(4), two equivalent Ni(3), two equivalent Ni(5), six equivalent Ni(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. The Y(1)-Ni(4) bond length is 3.53 Å. Both Y(1)-Ni(3) bond lengths are 3.04 Å. There is one shorter (2.99 Å) and one longer (3.46 Å) Y(1)-Ni(5) bond length. There are a spread of Y(1)-Ni(1) bond distances ranging from 2.95-3.10 Å. Both Y(1)-Sn(2) bond lengths are 3.29 Å. There are two shorter (3.28 Å) and two longer (3.32 Å) Y(1)-Sn(1) bond lengths. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(4), two equivalent Sn(2), and four equivalent Sn(3) atoms. Both Y(2)-Ni(2) bond lengths are 3.02 Å. Both Y(2)-Ni(3) bond lengths are 2.90 Å. There are two shorter (2.99 Å) and two longer (3.40 Å) Y(2)-Ni(4) bond lengths. Both Y(2)-Sn(2) bond lengths are 3.17 Å. There are two shorter (3.25 Å) and two longer (3.30 Å) Y(2)-Sn(3) bond lengths. There are five inequivalent Ni sites. In the first Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Y(1), four equivalent Y(2), one Ni(2), two equivalent Sn(2), and two equivalent Sn(3) atoms. The Ni(4)-Ni(2) bond length is 2.58 Å. Both Ni(4)-Sn(2) bond lengths are 2.68 Å. There is one shorter (2.62 Å) and one longer (2.71 Å) Ni(4)-Sn(3) bond length. In the second Ni site, Ni(5) is bonded in a 12-coordinate geometry to two equivalent Y(1), one Ni(2), two equivalent Ni(1), four equivalent Ni(3), one Sn(3), and two equivalent Sn(1) atoms. The Ni(5)-Ni(2) bond length is 2.41 Å. Both Ni(5)-Ni(1) bond lengths are 2.53 Å. There are two shorter (2.62 Å) and two longer (2.89 Å) Ni(5)-Ni(3) bond lengths. The Ni(5)-Sn(3) bond length is 2.57 Å. Both Ni(5)-Sn(1) bond lengths are 2.55 Å. In the third Ni site, Ni(1) is bonded in a 10-coordinate geometry to three equivalent Y(1), one Ni(1), one Ni(2), one Ni(3), one Ni(5), one Sn(2), and two equivalent Sn(1) atoms. The Ni(1)-Ni(1) bond length is 2.56 Å. The Ni(1)-Ni(2) bond length is 2.64 Å. The Ni(1)-Ni(3) bond length is 2.50 Å. The Ni(1)-Sn(2) bond length is 2.68 Å. There is one shorter (2.53 Å) and one longer (2.69 Å) Ni(1)-Sn(1) bond length. In the fourth Ni site, Ni(2) is bonded in a 11-coordinate geometry to two equivalent Y(2), one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(3), one Sn(3), and two equivalent Sn(2) atoms. Both Ni(2)-Ni(3) bond lengths are 2.54 Å. The Ni(2)-Sn(3) bond length is 2.83 Å. Both Ni(2)-Sn(2) bond lengths are 2.62 Å. In the fifth Ni site, Ni(3) is bonded in a 11-coordinate geometry to one Y(1), one Y(2), one Ni(1), one Ni(2), one Ni(3), two equivalent Ni(5), one Sn(1), one Sn(2), and two equivalent Sn(3) atoms. The Ni(3)-Ni(3) bond length is 2.40 Å. The Ni(3)-Sn(1) bond length is 2.69 Å. The Ni(3)-Sn(2) bond length is 2.62 Å. There is one shorter (2.59 Å) and one longer (3.02 Å) Ni(3)-Sn(3) bond length. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 12-coordinate geometry to four equivalent Y(1), two equivalent Ni(3), two equivalent Ni(5), and four equivalent Ni(1) atoms. In the second Sn site, Sn(2) is bonded to two equivalent Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), and two equivalent Ni(4) atoms to form a mixture of distorted corner and face-sharing SnY4Ni8 cuboctahedra. In the third Sn site, Sn(3) is bonded in a 12-coordinate geometry to four equivalent Y(2), one Ni(2), one Ni(5), two equivalent Ni(4), and four equivalent Ni(3) atoms.