La6NbGa11O28 crystallizes in the triclinic P1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(20), one O(21), one O(24), one O(25), one O(28), and one O(9) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(18), one O(19), one O(22), one O(23), one O(26), and one O(27) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(16), one O(18), one O(20), one O(27), one O(3), one O(6), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(17), one O(19), one O(2), one O(28), one O(4), and one O(5) atom. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one O(11), one O(14), one O(18), one O(19), one O(2), one O(26), one O(3), and one O(7) atom. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(17), one O(20), one O(25), one O(4), and one O(8) atom. Nb(1) is bonded to one O(14), one O(15), one O(21), one O(24), one O(5), and one O(7) atom to form NbO6 octahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid,  a cornercorner with one Ga(8)O5 trigonal bipyramid, and  a cornercorner with one Ga(9)O5 trigonal bipyramid. There are eleven inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(19), one O(25), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  a cornercorner with one Ga(8)O5 trigonal bipyramid. In the second Ga site, Ga(2) is bonded to one O(10), one O(2), one O(20), and one O(26) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(6)O4 tetrahedra and  a cornercorner with one Ga(9)O5 trigonal bipyramid. In the third Ga site, Ga(3) is bonded to one O(11), one O(17), one O(27), and one O(3) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  a cornercorner with one Ga(9)O5 trigonal bipyramid. In the fourth Ga site, Ga(4) is bonded to one O(12), one O(18), one O(28), and one O(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(6)O4 tetrahedra and  a cornercorner with one Ga(8)O5 trigonal bipyramid. In the fifth Ga site, Ga(5) is bonded to one O(11), one O(13), one O(15), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(7)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, and  a cornercorner with one Ga(8)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 64°. In the sixth Ga site, Ga(6) is bonded to one O(10), one O(12), one O(14), and one O(16) atom to form GaO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(7)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and  a cornercorner with one Ga(10)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 63-64°. In the seventh Ga site, Ga(7) is bonded to one O(13), one O(16), one O(22), one O(23), one O(6), and one O(8) atom to form distorted GaO6 octahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  an edgeedge with one Ga(10)O5 trigonal bipyramid,  an edgeedge with one Ga(8)O5 trigonal bipyramid, and  an edgeedge with one Ga(9)O5 trigonal bipyramid. In the eighth Ga site, Ga(8) is bonded to one O(1), one O(13), one O(22), one O(28), and one O(7) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra,  a cornercorner with one Ga(5)O4 tetrahedra, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 64°. In the ninth Ga site, Ga(9) is bonded to one O(2), one O(21), one O(23), one O(27), and one O(8) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. In the tenth Ga site, Ga(10) is bonded to one O(16), one O(23), one O(25), one O(3), and one O(5) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  a cornercorner with one Ga(9)O5 trigonal bipyramid, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 67°. In the eleventh Ga site, Ga(11) is bonded in a 5-coordinate geometry to one O(22), one O(24), one O(26), one O(4), and one O(6) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(3), one La(6), one Ga(1), and one Ga(8) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(4), one La(5), one Ga(2), and one Ga(9) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(3), one La(5), one Ga(10), and one Ga(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(4), one La(6), one Ga(11), and one Ga(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(4), one Nb(1), and one Ga(10) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(3), one Ga(11), and one Ga(7) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one La(5), one Nb(1), and one Ga(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one La(6), one Ga(7), and one Ga(9) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Ga(1), and one Ga(5) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(2), one La(4), one Ga(2), and one Ga(6) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one La(2), one La(5), one Ga(3), and one Ga(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(6), one Ga(4), and one Ga(6) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(6), one Ga(5), one Ga(7), and one Ga(8) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one La(5), one Nb(1), and one Ga(6) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one La(4), one Nb(1), and one Ga(5) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one La(3), one Ga(10), one Ga(6), and one Ga(7) atom. In the seventeenth O site, O(17) is bonded to one La(1), one La(4), one La(6), and one Ga(3) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the eighteenth O site, O(18) is bonded to one La(2), one La(3), one La(5), and one Ga(4) atom to form distorted OLa3Ga tetrahedra that share  a cornercorner with one O(20)La3Ga tetrahedra, corners with two equivalent O(19)La3Ga tetrahedra, and  a cornercorner with one O(23)LaGa3 trigonal pyramid. In the nineteenth O site, O(19) is bonded to one La(2), one La(4), one La(5), and one Ga(1) atom to form distorted OLa3Ga tetrahedra that share  a cornercorner with one O(17)La3Ga tetrahedra, corners with two equivalent O(18)La3Ga tetrahedra, and  a cornercorner with one O(23)LaGa3 trigonal pyramid. In the twentieth O site, O(20) is bonded to one La(1), one La(3), one La(6), and one Ga(2) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the twenty-first O site, O(21) is bonded in a distorted trigonal planar geometry to one La(1), one Nb(1), and one Ga(9) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one La(2), one Ga(11), one Ga(7), and one Ga(8) atom. In the twenty-third O site, O(23) is bonded to one La(2), one Ga(10), one Ga(7), and one Ga(9) atom to form distorted corner-sharing OLaGa3 trigonal pyramids. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one La(1), one Nb(1), and one Ga(11) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one La(1), one La(6), one Ga(1), and one Ga(10) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one La(2), one La(5), one Ga(11), and one Ga(2) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one La(2), one La(3), one Ga(3), and one Ga(9) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one La(1), one La(4), one Ga(4), and one Ga(8) atom.
La6NbGa11O28 crystallizes in the triclinic P1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(12), one O(17), one O(20), one O(21), one O(24), one O(25), one O(28), and one O(9) atom. The La(1)-O(12) bond length is 2.44 Å. The La(1)-O(17) bond length is 2.60 Å. The La(1)-O(20) bond length is 2.56 Å. The La(1)-O(21) bond length is 2.44 Å. The La(1)-O(24) bond length is 2.43 Å. The La(1)-O(25) bond length is 2.97 Å. The La(1)-O(28) bond length is 2.99 Å. The La(1)-O(9) bond length is 2.44 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(18), one O(19), one O(22), one O(23), one O(26), and one O(27) atom. The La(2)-O(10) bond length is 2.47 Å. The La(2)-O(11) bond length is 2.47 Å. The La(2)-O(18) bond length is 2.58 Å. The La(2)-O(19) bond length is 2.63 Å. The La(2)-O(22) bond length is 2.41 Å. The La(2)-O(23) bond length is 2.45 Å. The La(2)-O(26) bond length is 2.98 Å. The La(2)-O(27) bond length is 2.98 Å. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(16), one O(18), one O(20), one O(27), one O(3), one O(6), and one O(9) atom. The La(3)-O(1) bond length is 2.49 Å. The La(3)-O(16) bond length is 2.46 Å. The La(3)-O(18) bond length is 2.71 Å. The La(3)-O(20) bond length is 2.64 Å. The La(3)-O(27) bond length is 2.43 Å. The La(3)-O(3) bond length is 2.92 Å. The La(3)-O(6) bond length is 2.35 Å. The La(3)-O(9) bond length is 2.91 Å. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(17), one O(19), one O(2), one O(28), one O(4), and one O(5) atom. The La(4)-O(10) bond length is 2.94 Å. The La(4)-O(15) bond length is 2.48 Å. The La(4)-O(17) bond length is 2.71 Å. The La(4)-O(19) bond length is 2.59 Å. The La(4)-O(2) bond length is 2.45 Å. The La(4)-O(28) bond length is 2.42 Å. The La(4)-O(4) bond length is 2.95 Å. The La(4)-O(5) bond length is 2.47 Å. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one O(11), one O(14), one O(18), one O(19), one O(2), one O(26), one O(3), and one O(7) atom. The La(5)-O(11) bond length is 2.92 Å. The La(5)-O(14) bond length is 2.43 Å. The La(5)-O(18) bond length is 2.60 Å. The La(5)-O(19) bond length is 2.71 Å. The La(5)-O(2) bond length is 2.98 Å. The La(5)-O(26) bond length is 2.39 Å. The La(5)-O(3) bond length is 2.42 Å. The La(5)-O(7) bond length is 2.44 Å. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(13), one O(17), one O(20), one O(25), one O(4), and one O(8) atom. The La(6)-O(1) bond length is 2.86 Å. The La(6)-O(12) bond length is 2.90 Å. The La(6)-O(13) bond length is 2.53 Å. The La(6)-O(17) bond length is 2.64 Å. The La(6)-O(20) bond length is 2.70 Å. The La(6)-O(25) bond length is 2.48 Å. The La(6)-O(4) bond length is 2.52 Å. The La(6)-O(8) bond length is 2.36 Å. Nb(1) is bonded to one O(14), one O(15), one O(21), one O(24), one O(5), and one O(7) atom to form NbO6 octahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid,  a cornercorner with one Ga(8)O5 trigonal bipyramid, and  a cornercorner with one Ga(9)O5 trigonal bipyramid. The Nb(1)-O(14) bond length is 2.03 Å. The Nb(1)-O(15) bond length is 2.03 Å. The Nb(1)-O(21) bond length is 2.01 Å. The Nb(1)-O(24) bond length is 2.02 Å. The Nb(1)-O(5) bond length is 2.01 Å. The Nb(1)-O(7) bond length is 2.01 Å. There are eleven inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(19), one O(25), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  a cornercorner with one Ga(8)O5 trigonal bipyramid. The Ga(1)-O(1) bond length is 1.87 Å. The Ga(1)-O(19) bond length is 1.83 Å. The Ga(1)-O(25) bond length is 1.86 Å. The Ga(1)-O(9) bond length is 1.89 Å. In the second Ga site, Ga(2) is bonded to one O(10), one O(2), one O(20), and one O(26) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(6)O4 tetrahedra and  a cornercorner with one Ga(9)O5 trigonal bipyramid. The Ga(2)-O(10) bond length is 1.87 Å. The Ga(2)-O(2) bond length is 1.86 Å. The Ga(2)-O(20) bond length is 1.82 Å. The Ga(2)-O(26) bond length is 1.87 Å. In the third Ga site, Ga(3) is bonded to one O(11), one O(17), one O(27), and one O(3) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  a cornercorner with one Ga(9)O5 trigonal bipyramid. The Ga(3)-O(11) bond length is 1.87 Å. The Ga(3)-O(17) bond length is 1.82 Å. The Ga(3)-O(27) bond length is 1.85 Å. The Ga(3)-O(3) bond length is 1.87 Å. In the fourth Ga site, Ga(4) is bonded to one O(12), one O(18), one O(28), and one O(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(6)O4 tetrahedra and  a cornercorner with one Ga(8)O5 trigonal bipyramid. The Ga(4)-O(12) bond length is 1.89 Å. The Ga(4)-O(18) bond length is 1.82 Å. The Ga(4)-O(28) bond length is 1.87 Å. The Ga(4)-O(4) bond length is 1.86 Å. In the fifth Ga site, Ga(5) is bonded to one O(11), one O(13), one O(15), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(7)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, and  a cornercorner with one Ga(8)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 64°. The Ga(5)-O(11) bond length is 1.88 Å. The Ga(5)-O(13) bond length is 1.84 Å. The Ga(5)-O(15) bond length is 1.88 Å. The Ga(5)-O(9) bond length is 1.87 Å. In the sixth Ga site, Ga(6) is bonded to one O(10), one O(12), one O(14), and one O(16) atom to form GaO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(7)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and  a cornercorner with one Ga(10)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 63-64°. The Ga(6)-O(10) bond length is 1.89 Å. The Ga(6)-O(12) bond length is 1.88 Å. The Ga(6)-O(14) bond length is 1.88 Å. The Ga(6)-O(16) bond length is 1.84 Å. In the seventh Ga site, Ga(7) is bonded to one O(13), one O(16), one O(22), one O(23), one O(6), and one O(8) atom to form distorted GaO6 octahedra that share  a cornercorner with one Ga(5)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  an edgeedge with one Ga(10)O5 trigonal bipyramid,  an edgeedge with one Ga(8)O5 trigonal bipyramid, and  an edgeedge with one Ga(9)O5 trigonal bipyramid. The Ga(7)-O(13) bond length is 2.08 Å. The Ga(7)-O(16) bond length is 2.06 Å. The Ga(7)-O(22) bond length is 2.05 Å. The Ga(7)-O(23) bond length is 2.07 Å. The Ga(7)-O(6) bond length is 2.00 Å. The Ga(7)-O(8) bond length is 2.00 Å. In the eighth Ga site, Ga(8) is bonded to one O(1), one O(13), one O(22), one O(28), and one O(7) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra,  a cornercorner with one Ga(5)O4 tetrahedra, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 64°. The Ga(8)-O(1) bond length is 1.87 Å. The Ga(8)-O(13) bond length is 2.30 Å. The Ga(8)-O(22) bond length is 1.87 Å. The Ga(8)-O(28) bond length is 1.97 Å. The Ga(8)-O(7) bond length is 1.92 Å. In the ninth Ga site, Ga(9) is bonded to one O(2), one O(21), one O(23), one O(27), and one O(8) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra,  a cornercorner with one Ga(10)O5 trigonal bipyramid, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. The Ga(9)-O(2) bond length is 1.95 Å. The Ga(9)-O(21) bond length is 1.92 Å. The Ga(9)-O(23) bond length is 2.31 Å. The Ga(9)-O(27) bond length is 1.87 Å. The Ga(9)-O(8) bond length is 1.86 Å. In the tenth Ga site, Ga(10) is bonded to one O(16), one O(23), one O(25), one O(3), and one O(5) atom to form distorted GaO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra,  a cornercorner with one Ga(6)O4 tetrahedra,  a cornercorner with one Ga(9)O5 trigonal bipyramid, and  an edgeedge with one Ga(7)O6 octahedra. The corner-sharing octahedral tilt angles are 67°. The Ga(10)-O(16) bond length is 2.41 Å. The Ga(10)-O(23) bond length is 1.87 Å. The Ga(10)-O(25) bond length is 1.94 Å. The Ga(10)-O(3) bond length is 1.87 Å. The Ga(10)-O(5) bond length is 1.91 Å. In the eleventh Ga site, Ga(11) is bonded in a 5-coordinate geometry to one O(22), one O(24), one O(26), one O(4), and one O(6) atom. The Ga(11)-O(22) bond length is 2.45 Å. The Ga(11)-O(24) bond length is 1.90 Å. The Ga(11)-O(26) bond length is 1.88 Å. The Ga(11)-O(4) bond length is 1.93 Å. The Ga(11)-O(6) bond length is 1.85 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(3), one La(6), one Ga(1), and one Ga(8) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(4), one La(5), one Ga(2), and one Ga(9) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(3), one La(5), one Ga(10), and one Ga(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(4), one La(6), one Ga(11), and one Ga(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(4), one Nb(1), and one Ga(10) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one La(3), one Ga(11), and one Ga(7) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one La(5), one Nb(1), and one Ga(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one La(6), one Ga(7), and one Ga(9) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Ga(1), and one Ga(5) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one La(2), one La(4), one Ga(2), and one Ga(6) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one La(2), one La(5), one Ga(3), and one Ga(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(6), one Ga(4), and one Ga(6) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(6), one Ga(5), one Ga(7), and one Ga(8) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one La(5), one Nb(1), and one Ga(6) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one La(4), one Nb(1), and one Ga(5) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one La(3), one Ga(10), one Ga(6), and one Ga(7) atom. In the seventeenth O site, O(17) is bonded to one La(1), one La(4), one La(6), and one Ga(3) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the eighteenth O site, O(18) is bonded to one La(2), one La(3), one La(5), and one Ga(4) atom to form distorted OLa3Ga tetrahedra that share  a cornercorner with one O(20)La3Ga tetrahedra, corners with two equivalent O(19)La3Ga tetrahedra, and  a cornercorner with one O(23)LaGa3 trigonal pyramid. In the nineteenth O site, O(19) is bonded to one La(2), one La(4), one La(5), and one Ga(1) atom to form distorted OLa3Ga tetrahedra that share  a cornercorner with one O(17)La3Ga tetrahedra, corners with two equivalent O(18)La3Ga tetrahedra, and  a cornercorner with one O(23)LaGa3 trigonal pyramid. In the twentieth O site, O(20) is bonded to one La(1), one La(3), one La(6), and one Ga(2) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the twenty-first O site, O(21) is bonded in a distorted trigonal planar geometry to one La(1), one Nb(1), and one Ga(9) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one La(2), one Ga(11), one Ga(7), and one Ga(8) atom. In the twenty-third O site, O(23) is bonded to one La(2), one Ga(10), one Ga(7), and one Ga(9) atom to form distorted corner-sharing OLaGa3 trigonal pyramids. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one La(1), one Nb(1), and one Ga(11) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one La(1), one La(6), one Ga(1), and one Ga(10) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one La(2), one La(5), one Ga(11), and one Ga(2) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one La(2), one La(3), one Ga(3), and one Ga(9) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one La(1), one La(4), one Ga(4), and one Ga(8) atom.