La5Pb4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent La sites. In the first La site, La(1) is bonded to one Pb(2), two equivalent Pb(1), and three equivalent Pb(3) atoms to form a mixture of distorted edge, face, and corner-sharing LaPb6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 40-41°. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Pb(1), two equivalent Pb(2), and three equivalent Pb(3) atoms. In the third La site, La(3) is bonded to two equivalent Pb(1), two equivalent Pb(2), and two equivalent Pb(3) atoms to form a mixture of face and corner-sharing LaPb6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent La(3), four equivalent La(1), and one Pb(2) atom. In the second Pb site, Pb(2) is bonded in a 9-coordinate geometry to two equivalent La(1), two equivalent La(3), four equivalent La(2), and one Pb(1) atom. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one La(3), three equivalent La(1), and three equivalent La(2) atoms.
La5Pb4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent La sites. In the first La site, La(1) is bonded to one Pb(2), two equivalent Pb(1), and three equivalent Pb(3) atoms to form a mixture of distorted edge, face, and corner-sharing LaPb6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 40-41°. The La(1)-Pb(2) bond length is 3.44 Å. There is one shorter (3.38 Å) and one longer (3.41 Å) La(1)-Pb(1) bond length. There are a spread of La(1)-Pb(3) bond distances ranging from 3.24-3.35 Å. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Pb(1), two equivalent Pb(2), and three equivalent Pb(3) atoms. The La(2)-Pb(1) bond length is 3.57 Å. There is one shorter (3.33 Å) and one longer (3.58 Å) La(2)-Pb(2) bond length. There are a spread of La(2)-Pb(3) bond distances ranging from 3.34-3.61 Å. In the third La site, La(3) is bonded to two equivalent Pb(1), two equivalent Pb(2), and two equivalent Pb(3) atoms to form a mixture of face and corner-sharing LaPb6 octahedra. The corner-sharing octahedral tilt angles range from 50-53°. There is one shorter (3.32 Å) and one longer (3.46 Å) La(3)-Pb(1) bond length. There is one shorter (3.32 Å) and one longer (3.47 Å) La(3)-Pb(2) bond length. Both La(3)-Pb(3) bond lengths are 3.37 Å. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent La(3), four equivalent La(1), and one Pb(2) atom. The Pb(1)-Pb(2) bond length is 3.18 Å. In the second Pb site, Pb(2) is bonded in a 9-coordinate geometry to two equivalent La(1), two equivalent La(3), four equivalent La(2), and one Pb(1) atom. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one La(3), three equivalent La(1), and three equivalent La(2) atoms.