La2BiO5 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(7), and one O(9) atom. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an octahedral geometry to one O(1), one O(10), one O(2), one O(4), one O(7), and one O(9) atom. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(6), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra, corners with four equivalent O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra, and edges with two equivalent O(4)La3Bi tetrahedra. In the second O site, O(2) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(3)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra, corners with four equivalent O(1)La3Bi tetrahedra,  an edgeedge with one O(10)La2Bi2 tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and edges with two equivalent O(4)La3Bi tetrahedra. In the third O site, O(3) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(6)La3Bi tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra, edges with two equivalent O(5)La3Bi tetrahedra, and edges with two equivalent O(8)La3Bi tetrahedra. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, edges with two equivalent O(1)La3Bi tetrahedra, and edges with two equivalent O(2)La3Bi tetrahedra. In the fifth O site, O(5) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with four equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, edges with two equivalent O(3)La3Bi tetrahedra, and edges with two equivalent O(6)La3Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(3)La3Bi tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra, edges with two equivalent O(5)La3Bi tetrahedra, and edges with two equivalent O(8)La3Bi tetrahedra. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one La(1), one La(4), and one Bi(1) atom. In the eighth O site, O(8) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(10)La2Bi2 tetrahedra, edges with two equivalent O(3)La3Bi tetrahedra, and edges with two equivalent O(6)La3Bi tetrahedra. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one La(1), one La(4), and one Bi(1) atom. In the tenth O site, O(10) is bonded to one La(1), one La(4), one Bi(1), and one Bi(2) atom to form a mixture of edge and corner-sharing OLa2Bi2 tetrahedra.
La2BiO5 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(7), and one O(9) atom. The La(1)-O(1) bond length is 2.59 Å. The La(1)-O(10) bond length is 2.68 Å. The La(1)-O(2) bond length is 2.78 Å. The La(1)-O(4) bond length is 2.30 Å. The La(1)-O(7) bond length is 2.21 Å. The La(1)-O(9) bond length is 2.56 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The La(2)-O(1) bond length is 2.53 Å. The La(2)-O(2) bond length is 2.51 Å. The La(2)-O(3) bond length is 2.56 Å. The La(2)-O(4) bond length is 2.67 Å. The La(2)-O(5) bond length is 2.27 Å. The La(2)-O(6) bond length is 2.56 Å. The La(2)-O(8) bond length is 2.38 Å. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The La(3)-O(1) bond length is 2.48 Å. The La(3)-O(2) bond length is 2.56 Å. The La(3)-O(3) bond length is 2.67 Å. The La(3)-O(4) bond length is 2.73 Å. The La(3)-O(5) bond length is 2.24 Å. The La(3)-O(6) bond length is 2.57 Å. The La(3)-O(8) bond length is 2.39 Å. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The La(4)-O(10) bond length is 2.54 Å. The La(4)-O(3) bond length is 2.29 Å. The La(4)-O(5) bond length is 2.52 Å. The La(4)-O(6) bond length is 2.30 Å. The La(4)-O(7) bond length is 3.03 Å. The La(4)-O(8) bond length is 2.62 Å. The La(4)-O(9) bond length is 2.45 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an octahedral geometry to one O(1), one O(10), one O(2), one O(4), one O(7), and one O(9) atom. The Bi(1)-O(1) bond length is 2.25 Å. The Bi(1)-O(10) bond length is 2.23 Å. The Bi(1)-O(2) bond length is 2.20 Å. The Bi(1)-O(4) bond length is 2.17 Å. The Bi(1)-O(7) bond length is 2.12 Å. The Bi(1)-O(9) bond length is 2.16 Å. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(6), and one O(8) atom. The Bi(2)-O(10) bond length is 2.49 Å. The Bi(2)-O(3) bond length is 2.21 Å. The Bi(2)-O(5) bond length is 2.63 Å. The Bi(2)-O(6) bond length is 2.20 Å. The Bi(2)-O(8) bond length is 2.24 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra, corners with four equivalent O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra, and edges with two equivalent O(4)La3Bi tetrahedra. In the second O site, O(2) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(3)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra, corners with four equivalent O(1)La3Bi tetrahedra,  an edgeedge with one O(10)La2Bi2 tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and edges with two equivalent O(4)La3Bi tetrahedra. In the third O site, O(3) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(6)La3Bi tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra, edges with two equivalent O(5)La3Bi tetrahedra, and edges with two equivalent O(8)La3Bi tetrahedra. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, edges with two equivalent O(1)La3Bi tetrahedra, and edges with two equivalent O(2)La3Bi tetrahedra. In the fifth O site, O(5) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with four equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, edges with two equivalent O(3)La3Bi tetrahedra, and edges with two equivalent O(6)La3Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(10)La2Bi2 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(3)La3Bi tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra, edges with two equivalent O(5)La3Bi tetrahedra, and edges with two equivalent O(8)La3Bi tetrahedra. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one La(1), one La(4), and one Bi(1) atom. In the eighth O site, O(8) is bonded to one La(2), one La(3), one La(4), and one Bi(2) atom to form OLa3Bi tetrahedra that share corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra, corners with four equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(10)La2Bi2 tetrahedra, edges with two equivalent O(3)La3Bi tetrahedra, and edges with two equivalent O(6)La3Bi tetrahedra. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one La(1), one La(4), and one Bi(1) atom. In the tenth O site, O(10) is bonded to one La(1), one La(4), one Bi(1), and one Bi(2) atom to form a mixture of edge and corner-sharing OLa2Bi2 tetrahedra.