La5B3O13 crystallizes in the hexagonal P6_3/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), and four equivalent O(1) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. B(1) is bonded in a tetrahedral geometry to one O(2), one O(4), and two equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to three equivalent La(1) atoms. In the second O site, O(4) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(2), and one B(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(2), and one B(1) atom.
La5B3O13 crystallizes in the hexagonal P6_3/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), and four equivalent O(1) atoms. The La(1)-O(2) bond length is 2.65 Å. The La(1)-O(3) bond length is 2.30 Å. The La(1)-O(4) bond length is 2.44 Å. There are two shorter (2.50 Å) and two longer (2.58 Å) La(1)-O(1) bond lengths. In the second La site, La(2) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. All La(2)-O(1) bond lengths are 2.77 Å. All La(2)-O(2) bond lengths are 2.50 Å. All La(2)-O(4) bond lengths are 2.48 Å. B(1) is bonded in a tetrahedral geometry to one O(2), one O(4), and two equivalent O(1) atoms. The B(1)-O(2) bond length is 1.48 Å. The B(1)-O(4) bond length is 1.49 Å. Both B(1)-O(1) bond lengths are 1.50 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to three equivalent La(1) atoms. In the second O site, O(4) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(2), and one B(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(2), and one B(1) atom.