La7Ni16 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the tetragonal I-42m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to three equivalent Ni(1), three equivalent Ni(3), and six equivalent Ni(2) atoms. In the second La site, La(2) is bonded in a 12-coordinate geometry to four equivalent Ni(1), four equivalent Ni(2), and four equivalent Ni(3) atoms. In the third La site, La(3) is bonded in a 12-coordinate geometry to four equivalent Ni(1) and eight equivalent Ni(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to one La(3), two equivalent La(2), three equivalent La(1), one Ni(1), two equivalent Ni(2), and three equivalent Ni(3) atoms. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to one La(2), one La(3), three equivalent La(1), one Ni(1), one Ni(3), and four equivalent Ni(2) atoms. In the third Ni site, Ni(3) is bonded in a 11-coordinate geometry to two equivalent La(2), three equivalent La(1), one Ni(3), two equivalent Ni(2), and three equivalent Ni(1) atoms.
La7Ni16 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the tetragonal I-42m space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to three equivalent Ni(1), three equivalent Ni(3), and six equivalent Ni(2) atoms. There is one shorter (3.15 Å) and two longer (3.55 Å) La(1)-Ni(1) bond lengths. There are two shorter (2.82 Å) and one longer (3.32 Å) La(1)-Ni(3) bond length. There are a spread of La(1)-Ni(2) bond distances ranging from 2.79-3.14 Å. In the second La site, La(2) is bonded in a 12-coordinate geometry to four equivalent Ni(1), four equivalent Ni(2), and four equivalent Ni(3) atoms. All La(2)-Ni(1) bond lengths are 3.05 Å. All La(2)-Ni(2) bond lengths are 2.94 Å. All La(2)-Ni(3) bond lengths are 2.91 Å. In the third La site, La(3) is bonded in a 12-coordinate geometry to four equivalent Ni(1) and eight equivalent Ni(2) atoms. All La(3)-Ni(1) bond lengths are 2.92 Å. All La(3)-Ni(2) bond lengths are 2.96 Å. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to one La(3), two equivalent La(2), three equivalent La(1), one Ni(1), two equivalent Ni(2), and three equivalent Ni(3) atoms. The Ni(1)-Ni(1) bond length is 2.43 Å. Both Ni(1)-Ni(2) bond lengths are 2.50 Å. All Ni(1)-Ni(3) bond lengths are 2.51 Å. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to one La(2), one La(3), three equivalent La(1), one Ni(1), one Ni(3), and four equivalent Ni(2) atoms. The Ni(2)-Ni(3) bond length is 2.61 Å. There are a spread of Ni(2)-Ni(2) bond distances ranging from 2.53-2.68 Å. In the third Ni site, Ni(3) is bonded in a 11-coordinate geometry to two equivalent La(2), three equivalent La(1), one Ni(3), two equivalent Ni(2), and three equivalent Ni(1) atoms. The Ni(3)-Ni(3) bond length is 2.84 Å.