La3O2F5 crystallizes in the triclinic P1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to two equivalent O(1), one F(1), two equivalent F(10), two equivalent F(4), and two equivalent F(5) atoms. In the second La site, La(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(4), two equivalent F(2), and two equivalent F(7) atoms. In the third La site, La(3) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent F(3), two equivalent F(6), two equivalent F(8), and two equivalent F(9) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to two equivalent O(2), two equivalent O(4), one F(10), two equivalent F(1), and two equivalent F(5) atoms. In the fifth La site, La(5) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent F(2), two equivalent F(6), and two equivalent F(7) atoms. In the sixth La site, La(6) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent F(3), two equivalent F(4), and two equivalent F(8) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1) and two equivalent La(6) atoms to form distorted OLa4 tetrahedra that share corners with two equivalent F(3)La4 tetrahedra, corners with four equivalent O(1)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(3)La4 tetrahedra, and edges with four equivalent F(4)La4 tetrahedra. In the second O site, O(2) is bonded to two equivalent La(2) and two equivalent La(4) atoms to form OLa4 tetrahedra that share corners with two equivalent F(2)La4 tetrahedra, corners with four equivalent O(2)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra,  an edgeedge with one F(2)La4 tetrahedra, and edges with four equivalent O(4)La4 tetrahedra. In the third O site, O(3) is bonded to two equivalent La(3) and two equivalent La(5) atoms to form distorted OLa4 tetrahedra that share corners with two equivalent F(2)La4 tetrahedra, corners with two equivalent F(3)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(2)La4 tetrahedra,  an edgeedge with one F(3)La4 tetrahedra, and edges with four equivalent F(6)La4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent La(2) and two equivalent La(4) atoms to form OLa4 tetrahedra that share corners with two equivalent F(7)La4 tetrahedra, corners with four equivalent O(4)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra,  an edgeedge with one F(7)La4 tetrahedra, and edges with four equivalent O(2)La4 tetrahedra. There are ten inequivalent F sites. In the first F site, F(1) is bonded in a trigonal non-coplanar geometry to one La(1) and two equivalent La(4) atoms. In the second F site, F(2) is bonded to two equivalent La(2) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent O(2)La4 tetrahedra, corners with two equivalent O(3)La4 tetrahedra, corners with four equivalent O(4)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one O(2)La4 tetrahedra,  an edgeedge with one O(3)La4 tetrahedra, and edges with four equivalent F(7)La4 tetrahedra. In the third F site, F(3) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form distorted FLa4 tetrahedra that share corners with two equivalent O(1)La4 tetrahedra, corners with two equivalent O(3)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(4)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one O(1)La4 tetrahedra,  an edgeedge with one O(3)La4 tetrahedra, and edges with four equivalent F(8)La4 tetrahedra. In the fourth F site, F(4) is bonded to two equivalent La(1) and two equivalent La(6) atoms to form FLa4 tetrahedra that share corners with two equivalent F(8)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(4)La4 tetrahedra,  an edgeedge with one F(8)La4 tetrahedra, and edges with four equivalent O(1)La4 tetrahedra. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent La(4) atoms. In the sixth F site, F(6) is bonded to two equivalent La(3) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent F(7)La4 tetrahedra, corners with two equivalent F(8)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one F(7)La4 tetrahedra,  an edgeedge with one F(8)La4 tetrahedra, and edges with four equivalent O(3)La4 tetrahedra. In the seventh F site, F(7) is bonded to two equivalent La(2) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent O(4)La4 tetrahedra, corners with two equivalent F(6)La4 tetrahedra, corners with four equivalent O(2)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra,  an edgeedge with one O(4)La4 tetrahedra,  an edgeedge with one F(6)La4 tetrahedra, and edges with four equivalent F(2)La4 tetrahedra. In the eighth F site, F(8) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form distorted FLa4 tetrahedra that share corners with two equivalent F(4)La4 tetrahedra, corners with two equivalent F(6)La4 tetrahedra, corners with four equivalent O(1)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(4)La4 tetrahedra,  an edgeedge with one F(6)La4 tetrahedra, and edges with four equivalent F(3)La4 tetrahedra. In the ninth F site, F(9) is bonded in a distorted water-like geometry to two equivalent La(3) atoms. In the tenth F site, F(10) is bonded in a trigonal non-coplanar geometry to one La(4) and two equivalent La(1) atoms.
La3O2F5 crystallizes in the triclinic P1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to two equivalent O(1), one F(1), two equivalent F(10), two equivalent F(4), and two equivalent F(5) atoms. There is one shorter (2.55 Å) and one longer (2.73 Å) La(1)-O(1) bond length. The La(1)-F(1) bond length is 2.41 Å. There is one shorter (2.40 Å) and one longer (2.55 Å) La(1)-F(10) bond length. There is one shorter (2.45 Å) and one longer (2.63 Å) La(1)-F(4) bond length. There is one shorter (2.36 Å) and one longer (2.59 Å) La(1)-F(5) bond length. In the second La site, La(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(4), two equivalent F(2), and two equivalent F(7) atoms. There is one shorter (2.34 Å) and one longer (2.41 Å) La(2)-O(2) bond length. Both La(2)-O(4) bond lengths are 2.35 Å. There is one shorter (2.71 Å) and one longer (2.73 Å) La(2)-F(2) bond length. There is one shorter (2.81 Å) and one longer (2.84 Å) La(2)-F(7) bond length. In the third La site, La(3) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent F(3), two equivalent F(6), two equivalent F(8), and two equivalent F(9) atoms. There is one shorter (2.28 Å) and one longer (3.01 Å) La(3)-O(3) bond length. There is one shorter (2.40 Å) and one longer (2.97 Å) La(3)-F(3) bond length. There is one shorter (2.56 Å) and one longer (2.60 Å) La(3)-F(6) bond length. There is one shorter (2.77 Å) and one longer (2.81 Å) La(3)-F(8) bond length. There is one shorter (2.48 Å) and one longer (2.54 Å) La(3)-F(9) bond length. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to two equivalent O(2), two equivalent O(4), one F(10), two equivalent F(1), and two equivalent F(5) atoms. There is one shorter (2.42 Å) and one longer (2.47 Å) La(4)-O(2) bond length. There is one shorter (2.39 Å) and one longer (2.55 Å) La(4)-O(4) bond length. The La(4)-F(10) bond length is 2.71 Å. There is one shorter (2.54 Å) and one longer (2.69 Å) La(4)-F(1) bond length. There is one shorter (2.64 Å) and one longer (2.91 Å) La(4)-F(5) bond length. In the fifth La site, La(5) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent F(2), two equivalent F(6), and two equivalent F(7) atoms. Both La(5)-O(3) bond lengths are 2.38 Å. There is one shorter (2.60 Å) and one longer (2.62 Å) La(5)-F(2) bond length. There is one shorter (2.42 Å) and one longer (2.50 Å) La(5)-F(6) bond length. There is one shorter (2.51 Å) and one longer (2.52 Å) La(5)-F(7) bond length. In the sixth La site, La(6) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent F(3), two equivalent F(4), and two equivalent F(8) atoms. There is one shorter (2.33 Å) and one longer (2.45 Å) La(6)-O(1) bond length. Both La(6)-F(3) bond lengths are 2.56 Å. Both La(6)-F(4) bond lengths are 2.47 Å. There is one shorter (2.46 Å) and one longer (2.54 Å) La(6)-F(8) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1) and two equivalent La(6) atoms to form distorted OLa4 tetrahedra that share corners with two equivalent F(3)La4 tetrahedra, corners with four equivalent O(1)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(3)La4 tetrahedra, and edges with four equivalent F(4)La4 tetrahedra. In the second O site, O(2) is bonded to two equivalent La(2) and two equivalent La(4) atoms to form OLa4 tetrahedra that share corners with two equivalent F(2)La4 tetrahedra, corners with four equivalent O(2)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra,  an edgeedge with one F(2)La4 tetrahedra, and edges with four equivalent O(4)La4 tetrahedra. In the third O site, O(3) is bonded to two equivalent La(3) and two equivalent La(5) atoms to form distorted OLa4 tetrahedra that share corners with two equivalent F(2)La4 tetrahedra, corners with two equivalent F(3)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(2)La4 tetrahedra,  an edgeedge with one F(3)La4 tetrahedra, and edges with four equivalent F(6)La4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent La(2) and two equivalent La(4) atoms to form OLa4 tetrahedra that share corners with two equivalent F(7)La4 tetrahedra, corners with four equivalent O(4)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra,  an edgeedge with one F(7)La4 tetrahedra, and edges with four equivalent O(2)La4 tetrahedra. There are ten inequivalent F sites. In the first F site, F(1) is bonded in a trigonal non-coplanar geometry to one La(1) and two equivalent La(4) atoms. In the second F site, F(2) is bonded to two equivalent La(2) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent O(2)La4 tetrahedra, corners with two equivalent O(3)La4 tetrahedra, corners with four equivalent O(4)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one O(2)La4 tetrahedra,  an edgeedge with one O(3)La4 tetrahedra, and edges with four equivalent F(7)La4 tetrahedra. In the third F site, F(3) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form distorted FLa4 tetrahedra that share corners with two equivalent O(1)La4 tetrahedra, corners with two equivalent O(3)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(4)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one O(1)La4 tetrahedra,  an edgeedge with one O(3)La4 tetrahedra, and edges with four equivalent F(8)La4 tetrahedra. In the fourth F site, F(4) is bonded to two equivalent La(1) and two equivalent La(6) atoms to form FLa4 tetrahedra that share corners with two equivalent F(8)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(4)La4 tetrahedra,  an edgeedge with one F(8)La4 tetrahedra, and edges with four equivalent O(1)La4 tetrahedra. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent La(4) atoms. In the sixth F site, F(6) is bonded to two equivalent La(3) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent F(7)La4 tetrahedra, corners with two equivalent F(8)La4 tetrahedra, corners with four equivalent F(2)La4 tetrahedra, corners with four equivalent F(3)La4 tetrahedra, corners with four equivalent F(6)La4 tetrahedra,  an edgeedge with one F(7)La4 tetrahedra,  an edgeedge with one F(8)La4 tetrahedra, and edges with four equivalent O(3)La4 tetrahedra. In the seventh F site, F(7) is bonded to two equivalent La(2) and two equivalent La(5) atoms to form FLa4 tetrahedra that share corners with two equivalent O(4)La4 tetrahedra, corners with two equivalent F(6)La4 tetrahedra, corners with four equivalent O(2)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(7)La4 tetrahedra,  an edgeedge with one O(4)La4 tetrahedra,  an edgeedge with one F(6)La4 tetrahedra, and edges with four equivalent F(2)La4 tetrahedra. In the eighth F site, F(8) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form distorted FLa4 tetrahedra that share corners with two equivalent F(4)La4 tetrahedra, corners with two equivalent F(6)La4 tetrahedra, corners with four equivalent O(1)La4 tetrahedra, corners with four equivalent O(3)La4 tetrahedra, corners with four equivalent F(8)La4 tetrahedra,  an edgeedge with one F(4)La4 tetrahedra,  an edgeedge with one F(6)La4 tetrahedra, and edges with four equivalent F(3)La4 tetrahedra. In the ninth F site, F(9) is bonded in a distorted water-like geometry to two equivalent La(3) atoms. In the tenth F site, F(10) is bonded in a trigonal non-coplanar geometry to one La(4) and two equivalent La(1) atoms.