LaBSiO5 crystallizes in the trigonal P3_1 space group. La(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. B(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form BO4 tetrahedra that share corners with two equivalent B(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent B(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent La(1), one B(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent La(1), one B(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one La(1) and two equivalent B(1) atoms.
LaBSiO5 crystallizes in the trigonal P3_1 space group. La(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The La(1)-O(5) bond length is 2.63 Å. There is one shorter (2.41 Å) and one longer (2.61 Å) La(1)-O(1) bond length. There is one shorter (2.42 Å) and one longer (2.59 Å) La(1)-O(2) bond length. There is one shorter (2.70 Å) and one longer (2.76 Å) La(1)-O(3) bond length. There is one shorter (2.64 Å) and one longer (2.78 Å) La(1)-O(4) bond length. B(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form BO4 tetrahedra that share corners with two equivalent B(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. The B(1)-O(3) bond length is 1.52 Å. The B(1)-O(4) bond length is 1.50 Å. There is one shorter (1.45 Å) and one longer (1.46 Å) B(1)-O(5) bond length. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent B(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.61 Å. The Si(1)-O(2) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.68 Å. The Si(1)-O(4) bond length is 1.68 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent La(1), one B(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent La(1), one B(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one La(1) and two equivalent B(1) atoms.