SrLa4Si3O13 crystallizes in the hexagonal P6_3 space group. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(5), two equivalent O(2), and two equivalent O(3) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one La(2), and one Si(1) atom. In the second O site, O(5) is bonded in a trigonal planar geometry to three equivalent La(2) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one La(2), and one Si(1) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one La(1), two equivalent La(2), and one Si(1) atom. In the fifth O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent La(2), and one Si(1) atom.
SrLa4Si3O13 crystallizes in the hexagonal P6_3 space group. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms. All Sr(1)-O(1) bond lengths are 2.54 Å. All Sr(1)-O(3) bond lengths are 2.93 Å. All Sr(1)-O(4) bond lengths are 2.59 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. All La(1)-O(1) bond lengths are 2.48 Å. All La(1)-O(2) bond lengths are 2.90 Å. All La(1)-O(4) bond lengths are 2.54 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(5), two equivalent O(2), and two equivalent O(3) atoms. The La(2)-O(1) bond length is 2.75 Å. The La(2)-O(4) bond length is 2.51 Å. The La(2)-O(5) bond length is 2.33 Å. There is one shorter (2.48 Å) and one longer (2.60 Å) La(2)-O(2) bond length. There is one shorter (2.47 Å) and one longer (2.59 Å) La(2)-O(3) bond length. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.65 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one La(2), and one Si(1) atom. In the second O site, O(5) is bonded in a trigonal planar geometry to three equivalent La(2) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one La(2), and one Si(1) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one La(1), two equivalent La(2), and one Si(1) atom. In the fifth O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent La(2), and one Si(1) atom.