La11Sn10 is delta Molybdenum Boride-like structured and crystallizes in the tetragonal I4/mmm space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent Sn(3) and four equivalent Sn(5) atoms. In the second La site, La(2) is bonded to one Sn(3), two equivalent Sn(1), two equivalent Sn(4), and two equivalent Sn(5) atoms to form a mixture of distorted edge and face-sharing LaSn7 pentagonal bipyramids. In the third La site, La(3) is bonded in a 7-coordinate geometry to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one Sn(2), two equivalent Sn(3), two equivalent Sn(4), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to four equivalent La(2) and four equivalent La(3) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to four equivalent La(3) and four equivalent La(4) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to one La(2), two equivalent La(1), four equivalent La(4), and two equivalent Sn(3) atoms. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent La(3), four equivalent La(4), and one Sn(4) atom. In the fifth Sn site, Sn(5) is bonded in a 9-coordinate geometry to one La(1), one La(2), two equivalent La(4), four equivalent La(3), and one Sn(5) atom.
La11Sn10 is delta Molybdenum Boride-like structured and crystallizes in the tetragonal I4/mmm space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent Sn(3) and four equivalent Sn(5) atoms. All La(1)-Sn(3) bond lengths are 3.63 Å. All La(1)-Sn(5) bond lengths are 3.64 Å. In the second La site, La(2) is bonded to one Sn(3), two equivalent Sn(1), two equivalent Sn(4), and two equivalent Sn(5) atoms to form a mixture of distorted edge and face-sharing LaSn7 pentagonal bipyramids. The La(2)-Sn(3) bond length is 3.44 Å. Both La(2)-Sn(1) bond lengths are 3.66 Å. Both La(2)-Sn(4) bond lengths are 3.15 Å. Both La(2)-Sn(5) bond lengths are 3.83 Å. In the third La site, La(3) is bonded in a 7-coordinate geometry to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms. The La(3)-Sn(1) bond length is 3.43 Å. The La(3)-Sn(2) bond length is 3.23 Å. The La(3)-Sn(4) bond length is 3.76 Å. There are two shorter (3.54 Å) and two longer (3.58 Å) La(3)-Sn(5) bond lengths. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one Sn(2), two equivalent Sn(3), two equivalent Sn(4), and two equivalent Sn(5) atoms. The La(4)-Sn(2) bond length is 3.47 Å. Both La(4)-Sn(3) bond lengths are 3.43 Å. Both La(4)-Sn(4) bond lengths are 3.31 Å. Both La(4)-Sn(5) bond lengths are 3.24 Å. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to four equivalent La(2) and four equivalent La(3) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to four equivalent La(3) and four equivalent La(4) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to one La(2), two equivalent La(1), four equivalent La(4), and two equivalent Sn(3) atoms. Both Sn(3)-Sn(3) bond lengths are 2.99 Å. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent La(3), four equivalent La(4), and one Sn(4) atom. The Sn(4)-Sn(4) bond length is 3.31 Å. In the fifth Sn site, Sn(5) is bonded in a 9-coordinate geometry to one La(1), one La(2), two equivalent La(4), four equivalent La(3), and one Sn(5) atom. The Sn(5)-Sn(5) bond length is 2.93 Å.