La6TaGa11O28 is Esseneite-like structured and crystallizes in the monoclinic C2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(14), one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to two equivalent O(12), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. Ta(1) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(13) atoms to form TaO6 octahedra that share corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(2)O4 tetrahedra, and corners with two equivalent Ga(3)O4 tetrahedra. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(11), one O(3), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra, and corners with two equivalent Ga(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. In the second Ga site, Ga(2) is bonded to one O(10), one O(12), one O(2), and one O(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra, and corners with two equivalent Ga(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. In the third Ga site, Ga(3) is bonded to one O(13), one O(14), one O(5), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and  a cornercorner with one Ga(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. In the fourth Ga site, Ga(4) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form corner-sharing GaO4 tetrahedra. In the fifth Ga site, Ga(5) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form corner-sharing GaO4 tetrahedra. In the sixth Ga site, Ga(6) is bonded to two equivalent O(12), two equivalent O(14), and two equivalent O(9) atoms to form corner-sharing GaO6 octahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Ga(1), and one Ga(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), one Ga(2), and one Ga(5) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one La(3), one Ga(1), and one Ga(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(1), one La(4), one Ga(2), and one Ga(5) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Ga(3), and one Ga(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(2), one La(4), one Ga(3), and one Ga(5) atom. In the seventh O site, O(7) is bonded to one La(1), one La(2), one La(4), and one Ga(4) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the eighth O site, O(8) is bonded to one La(1), one La(2), one La(3), and one Ga(5) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one La(1), one Ga(1), and one Ga(6) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one La(2), one Ta(1), and one Ga(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one La(4), one Ta(1), and one Ga(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one La(3), one Ga(2), and one Ga(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one La(2), one Ta(1), and one Ga(3) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one La(1), one Ga(3), and one Ga(6) atom.
La6TaGa11O28 is Esseneite-like structured and crystallizes in the monoclinic C2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(14), one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. The La(1)-O(1) bond length is 2.51 Å. The La(1)-O(14) bond length is 2.39 Å. The La(1)-O(2) bond length is 2.91 Å. The La(1)-O(4) bond length is 2.51 Å. The La(1)-O(5) bond length is 2.89 Å. The La(1)-O(7) bond length is 2.69 Å. The La(1)-O(8) bond length is 2.66 Å. The La(1)-O(9) bond length is 2.40 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. The La(2)-O(1) bond length is 2.92 Å. The La(2)-O(10) bond length is 2.46 Å. The La(2)-O(13) bond length is 2.47 Å. The La(2)-O(2) bond length is 2.44 Å. The La(2)-O(3) bond length is 2.43 Å. The La(2)-O(6) bond length is 2.94 Å. The La(2)-O(7) bond length is 2.64 Å. The La(2)-O(8) bond length is 2.61 Å. In the third La site, La(3) is bonded in a 8-coordinate geometry to two equivalent O(12), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. Both La(3)-O(12) bond lengths are 2.39 Å. Both La(3)-O(3) bond lengths are 2.90 Å. Both La(3)-O(5) bond lengths are 2.49 Å. Both La(3)-O(8) bond lengths are 2.67 Å. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms. Both La(4)-O(11) bond lengths are 2.47 Å. Both La(4)-O(4) bond lengths are 2.92 Å. Both La(4)-O(6) bond lengths are 2.45 Å. Both La(4)-O(7) bond lengths are 2.63 Å. Ta(1) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(13) atoms to form TaO6 octahedra that share corners with two equivalent Ga(1)O4 tetrahedra, corners with two equivalent Ga(2)O4 tetrahedra, and corners with two equivalent Ga(3)O4 tetrahedra. Both Ta(1)-O(10) bond lengths are 2.01 Å. Both Ta(1)-O(11) bond lengths are 2.01 Å. Both Ta(1)-O(13) bond lengths are 2.01 Å. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(11), one O(3), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra, and corners with two equivalent Ga(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. The Ga(1)-O(1) bond length is 1.90 Å. The Ga(1)-O(11) bond length is 1.90 Å. The Ga(1)-O(3) bond length is 1.88 Å. The Ga(1)-O(9) bond length is 1.84 Å. In the second Ga site, Ga(2) is bonded to one O(10), one O(12), one O(2), and one O(4) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra, and corners with two equivalent Ga(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. The Ga(2)-O(10) bond length is 1.91 Å. The Ga(2)-O(12) bond length is 1.84 Å. The Ga(2)-O(2) bond length is 1.88 Å. The Ga(2)-O(4) bond length is 1.91 Å. In the third Ga site, Ga(3) is bonded to one O(13), one O(14), one O(5), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ga(6)O6 octahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and  a cornercorner with one Ga(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-67°. The Ga(3)-O(13) bond length is 1.91 Å. The Ga(3)-O(14) bond length is 1.84 Å. The Ga(3)-O(5) bond length is 1.87 Å. The Ga(3)-O(6) bond length is 1.91 Å. In the fourth Ga site, Ga(4) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form corner-sharing GaO4 tetrahedra. The Ga(4)-O(1) bond length is 1.87 Å. The Ga(4)-O(3) bond length is 1.87 Å. The Ga(4)-O(5) bond length is 1.87 Å. The Ga(4)-O(7) bond length is 1.82 Å. In the fifth Ga site, Ga(5) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form corner-sharing GaO4 tetrahedra. The Ga(5)-O(2) bond length is 1.87 Å. The Ga(5)-O(4) bond length is 1.87 Å. The Ga(5)-O(6) bond length is 1.88 Å. The Ga(5)-O(8) bond length is 1.82 Å. In the sixth Ga site, Ga(6) is bonded to two equivalent O(12), two equivalent O(14), and two equivalent O(9) atoms to form corner-sharing GaO6 octahedra. Both Ga(6)-O(12) bond lengths are 2.04 Å. Both Ga(6)-O(14) bond lengths are 2.04 Å. Both Ga(6)-O(9) bond lengths are 2.04 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Ga(1), and one Ga(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), one Ga(2), and one Ga(5) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one La(3), one Ga(1), and one Ga(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(1), one La(4), one Ga(2), and one Ga(5) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Ga(3), and one Ga(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one La(2), one La(4), one Ga(3), and one Ga(5) atom. In the seventh O site, O(7) is bonded to one La(1), one La(2), one La(4), and one Ga(4) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the eighth O site, O(8) is bonded to one La(1), one La(2), one La(3), and one Ga(5) atom to form distorted corner-sharing OLa3Ga tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one La(1), one Ga(1), and one Ga(6) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one La(2), one Ta(1), and one Ga(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one La(4), one Ta(1), and one Ga(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one La(3), one Ga(2), and one Ga(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one La(2), one Ta(1), and one Ga(3) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one La(1), one Ga(3), and one Ga(6) atom.