Y5Sb3 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to two equivalent Sb(2) and four equivalent Sb(1) atoms. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to two equivalent Sb(2) and three equivalent Sb(1) atoms. In the third Y site, Y(3) is bonded in a 5-coordinate geometry to one Sb(2) and four equivalent Sb(1) atoms. In the fourth Y site, Y(4) is bonded to one Sb(2) and four equivalent Sb(1) atoms to form distorted edge-sharing YSb5 square pyramids. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to two equivalent Y(1), two equivalent Y(3), two equivalent Y(4), and three equivalent Y(2) atoms. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to one Y(3), one Y(4), two equivalent Y(1), and four equivalent Y(2) atoms.
Y5Sb3 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to two equivalent Sb(2) and four equivalent Sb(1) atoms. There is one shorter (3.05 Å) and one longer (3.57 Å) Y(1)-Sb(2) bond length. There are two shorter (3.18 Å) and two longer (3.29 Å) Y(1)-Sb(1) bond lengths. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to two equivalent Sb(2) and three equivalent Sb(1) atoms. There is one shorter (3.01 Å) and one longer (3.12 Å) Y(2)-Sb(2) bond length. There are a spread of Y(2)-Sb(1) bond distances ranging from 3.30-3.55 Å. In the third Y site, Y(3) is bonded in a 5-coordinate geometry to one Sb(2) and four equivalent Sb(1) atoms. The Y(3)-Sb(2) bond length is 3.00 Å. There are two shorter (3.23 Å) and two longer (3.31 Å) Y(3)-Sb(1) bond lengths. In the fourth Y site, Y(4) is bonded to one Sb(2) and four equivalent Sb(1) atoms to form distorted edge-sharing YSb5 square pyramids. The Y(4)-Sb(2) bond length is 3.12 Å. There are two shorter (3.16 Å) and two longer (3.18 Å) Y(4)-Sb(1) bond lengths. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to two equivalent Y(1), two equivalent Y(3), two equivalent Y(4), and three equivalent Y(2) atoms. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to one Y(3), one Y(4), two equivalent Y(1), and four equivalent Y(2) atoms.