K9Ta10O30 crystallizes in the triclinic P-1 space group. There are five inequivalent K sites. In the first K site, K(1) is bonded to one O(16), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(13), and two equivalent O(14) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(1)O12 cuboctahedra, corners with two equivalent K(2)O12 cuboctahedra, corners with two equivalent K(4)O12 cuboctahedra, corners with three equivalent K(3)O12 cuboctahedra, corners with three equivalent K(5)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(3)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(4)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. In the second K site, K(2) is bonded to one O(1), one O(12), one O(13), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(11), and two equivalent O(2) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(2)O12 cuboctahedra,  a cornercorner with one K(4)O12 cuboctahedra, corners with two equivalent K(1)O12 cuboctahedra, corners with three equivalent K(3)O12 cuboctahedra, corners with four equivalent K(5)O12 cuboctahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Ta(5)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(4)O6 octahedra. In the third K site, K(3) is bonded to one O(11), one O(12), one O(14), one O(15), one O(3), one O(4), one O(8), one O(9), two equivalent O(10), and two equivalent O(5) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(3)O12 cuboctahedra,  a cornercorner with one K(4)O12 cuboctahedra, corners with two equivalent K(5)O12 cuboctahedra, corners with three equivalent K(1)O12 cuboctahedra, corners with three equivalent K(2)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(5)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Ta(3)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(4)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. In the fourth K site, K(4) is bonded to two equivalent O(1), two equivalent O(10), two equivalent O(11), two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms to form KO12 cuboctahedra that share corners with two equivalent K(2)O12 cuboctahedra, corners with two equivalent K(3)O12 cuboctahedra, corners with two equivalent K(5)O12 cuboctahedra, corners with four equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with two equivalent K(5)O12 cuboctahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(4)O6 octahedra. In the fifth K site, K(5) is bonded to one O(1), one O(10), one O(12), one O(14), one O(15), one O(4), one O(6), one O(9), two equivalent O(16), and two equivalent O(3) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(4)O12 cuboctahedra,  a cornercorner with one K(5)O12 cuboctahedra, corners with two equivalent K(3)O12 cuboctahedra, corners with three equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(4)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. There are five inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(13), one O(14), one O(16), one O(3), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(11), one O(2), one O(4), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the third Ta site, Ta(3) is bonded to one O(11), one O(12), one O(16), one O(2), one O(3), and one O(6) atom to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Ta site, Ta(4) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fifth Ta site, Ta(5) is bonded to one O(12), one O(13), one O(14), one O(15), one O(4), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra,  a faceface with one K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(2), one K(4), one K(5), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one K(1), two equivalent K(2), one Ta(2), and one Ta(3) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one K(3), one K(4), two equivalent K(5), one Ta(1), and one Ta(3) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one K(1), one K(3), one K(5), one Ta(2), and one Ta(5) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one K(1), one K(2), two equivalent K(3), one Ta(2), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one K(1), one K(2), one K(4), one K(5), one Ta(3), and one Ta(4) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), and two equivalent Ta(4) atoms. In the eighth O site, O(8) is bonded in a distorted linear geometry to one K(1), one K(2), one K(3), one K(4), one Ta(1), and one Ta(4) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one K(1), one K(2), one K(3), one K(5), one Ta(4), and one Ta(5) atom. In the tenth O site, O(10) is bonded in a distorted linear geometry to one K(4), one K(5), two equivalent K(3), one Ta(2), and one Ta(4) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one K(3), one K(4), two equivalent K(2), one Ta(2), and one Ta(3) atom. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one K(2), one K(3), one K(5), one Ta(3), and one Ta(5) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one K(2), two equivalent K(1), one Ta(1), and one Ta(5) atom. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one K(3), one K(5), two equivalent K(1), one Ta(1), and one Ta(5) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to two equivalent K(3), two equivalent K(5), and two equivalent Ta(5) atoms. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to one K(1), two equivalent K(5), one Ta(1), and one Ta(3) atom.
K9Ta10O30 crystallizes in the triclinic P-1 space group. There are five inequivalent K sites. In the first K site, K(1) is bonded to one O(16), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(13), and two equivalent O(14) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(1)O12 cuboctahedra, corners with two equivalent K(2)O12 cuboctahedra, corners with two equivalent K(4)O12 cuboctahedra, corners with three equivalent K(3)O12 cuboctahedra, corners with three equivalent K(5)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(3)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(4)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. The K(1)-O(16) bond length is 2.84 Å. The K(1)-O(2) bond length is 2.84 Å. The K(1)-O(4) bond length is 2.84 Å. The K(1)-O(5) bond length is 2.84 Å. The K(1)-O(6) bond length is 2.84 Å. The K(1)-O(7) bond length is 2.85 Å. The K(1)-O(8) bond length is 2.85 Å. The K(1)-O(9) bond length is 2.85 Å. There is one shorter (2.83 Å) and one longer (2.84 Å) K(1)-O(13) bond length. There is one shorter (2.84 Å) and one longer (2.85 Å) K(1)-O(14) bond length. In the second K site, K(2) is bonded to one O(1), one O(12), one O(13), one O(5), one O(6), one O(7), one O(8), one O(9), two equivalent O(11), and two equivalent O(2) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(2)O12 cuboctahedra,  a cornercorner with one K(4)O12 cuboctahedra, corners with two equivalent K(1)O12 cuboctahedra, corners with three equivalent K(3)O12 cuboctahedra, corners with four equivalent K(5)O12 cuboctahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Ta(5)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(4)O6 octahedra. The K(2)-O(1) bond length is 2.84 Å. The K(2)-O(12) bond length is 2.84 Å. The K(2)-O(13) bond length is 2.84 Å. The K(2)-O(5) bond length is 2.85 Å. The K(2)-O(6) bond length is 2.85 Å. The K(2)-O(7) bond length is 2.85 Å. The K(2)-O(8) bond length is 2.84 Å. The K(2)-O(9) bond length is 2.84 Å. Both K(2)-O(11) bond lengths are 2.85 Å. There is one shorter (2.83 Å) and one longer (2.84 Å) K(2)-O(2) bond length. In the third K site, K(3) is bonded to one O(11), one O(12), one O(14), one O(15), one O(3), one O(4), one O(8), one O(9), two equivalent O(10), and two equivalent O(5) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(3)O12 cuboctahedra,  a cornercorner with one K(4)O12 cuboctahedra, corners with two equivalent K(5)O12 cuboctahedra, corners with three equivalent K(1)O12 cuboctahedra, corners with three equivalent K(2)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(5)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Ta(3)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(4)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. The K(3)-O(11) bond length is 2.84 Å. The K(3)-O(12) bond length is 2.82 Å. The K(3)-O(14) bond length is 2.85 Å. The K(3)-O(15) bond length is 2.85 Å. The K(3)-O(3) bond length is 2.84 Å. The K(3)-O(4) bond length is 2.83 Å. The K(3)-O(8) bond length is 2.84 Å. The K(3)-O(9) bond length is 2.85 Å. There is one shorter (2.84 Å) and one longer (2.85 Å) K(3)-O(10) bond length. Both K(3)-O(5) bond lengths are 2.85 Å. In the fourth K site, K(4) is bonded to two equivalent O(1), two equivalent O(10), two equivalent O(11), two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms to form KO12 cuboctahedra that share corners with two equivalent K(2)O12 cuboctahedra, corners with two equivalent K(3)O12 cuboctahedra, corners with two equivalent K(5)O12 cuboctahedra, corners with four equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with two equivalent K(5)O12 cuboctahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(2)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(4)O6 octahedra. Both K(4)-O(1) bond lengths are 2.82 Å. Both K(4)-O(10) bond lengths are 2.85 Å. Both K(4)-O(11) bond lengths are 2.85 Å. Both K(4)-O(3) bond lengths are 2.85 Å. Both K(4)-O(6) bond lengths are 2.85 Å. Both K(4)-O(8) bond lengths are 2.85 Å. In the fifth K site, K(5) is bonded to one O(1), one O(10), one O(12), one O(14), one O(15), one O(4), one O(6), one O(9), two equivalent O(16), and two equivalent O(3) atoms to form KO12 cuboctahedra that share  a cornercorner with one K(4)O12 cuboctahedra,  a cornercorner with one K(5)O12 cuboctahedra, corners with two equivalent K(3)O12 cuboctahedra, corners with three equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Ta(4)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, faces with two equivalent Ta(3)O6 octahedra, and faces with two equivalent Ta(5)O6 octahedra. The K(5)-O(1) bond length is 2.84 Å. The K(5)-O(10) bond length is 2.84 Å. The K(5)-O(12) bond length is 2.84 Å. The K(5)-O(14) bond length is 2.85 Å. The K(5)-O(15) bond length is 2.84 Å. The K(5)-O(4) bond length is 2.84 Å. The K(5)-O(6) bond length is 2.85 Å. The K(5)-O(9) bond length is 2.85 Å. There is one shorter (2.83 Å) and one longer (2.84 Å) K(5)-O(16) bond length. There is one shorter (2.84 Å) and one longer (2.85 Å) K(5)-O(3) bond length. There are five inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(13), one O(14), one O(16), one O(3), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra,  a faceface with one K(2)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ta(1)-O(1) bond length is 2.00 Å. The Ta(1)-O(13) bond length is 1.99 Å. The Ta(1)-O(14) bond length is 2.02 Å. The Ta(1)-O(16) bond length is 1.99 Å. The Ta(1)-O(3) bond length is 2.03 Å. The Ta(1)-O(8) bond length is 2.03 Å. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(11), one O(2), one O(4), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. The Ta(2)-O(1) bond length is 1.99 Å. The Ta(2)-O(10) bond length is 2.04 Å. The Ta(2)-O(11) bond length is 2.03 Å. The Ta(2)-O(2) bond length is 1.99 Å. The Ta(2)-O(4) bond length is 2.00 Å. The Ta(2)-O(5) bond length is 2.03 Å. In the third Ta site, Ta(3) is bonded to one O(11), one O(12), one O(16), one O(2), one O(3), and one O(6) atom to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra,  a faceface with one K(1)O12 cuboctahedra,  a faceface with one K(3)O12 cuboctahedra,  a faceface with one K(4)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ta(3)-O(11) bond length is 2.03 Å. The Ta(3)-O(12) bond length is 1.99 Å. The Ta(3)-O(16) bond length is 2.00 Å. The Ta(3)-O(2) bond length is 2.00 Å. The Ta(3)-O(3) bond length is 2.02 Å. The Ta(3)-O(6) bond length is 2.03 Å. In the fourth Ta site, Ta(4) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra,  a faceface with one K(4)O12 cuboctahedra,  a faceface with one K(5)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent K(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. The Ta(4)-O(10) bond length is 2.01 Å. The Ta(4)-O(5) bond length is 2.01 Å. The Ta(4)-O(6) bond length is 2.01 Å. The Ta(4)-O(7) bond length is 2.02 Å. The Ta(4)-O(8) bond length is 2.01 Å. The Ta(4)-O(9) bond length is 2.01 Å. In the fifth Ta site, Ta(5) is bonded to one O(12), one O(13), one O(14), one O(15), one O(4), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra,  a faceface with one K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, and faces with two equivalent K(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ta(5)-O(12) bond length is 2.00 Å. The Ta(5)-O(13) bond length is 2.00 Å. The Ta(5)-O(14) bond length is 2.03 Å. The Ta(5)-O(15) bond length is 2.03 Å. The Ta(5)-O(4) bond length is 1.99 Å. The Ta(5)-O(9) bond length is 2.03 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(2), one K(4), one K(5), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one K(1), two equivalent K(2), one Ta(2), and one Ta(3) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one K(3), one K(4), two equivalent K(5), one Ta(1), and one Ta(3) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one K(1), one K(3), one K(5), one Ta(2), and one Ta(5) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one K(1), one K(2), two equivalent K(3), one Ta(2), and one Ta(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one K(1), one K(2), one K(4), one K(5), one Ta(3), and one Ta(4) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), and two equivalent Ta(4) atoms. In the eighth O site, O(8) is bonded in a distorted linear geometry to one K(1), one K(2), one K(3), one K(4), one Ta(1), and one Ta(4) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one K(1), one K(2), one K(3), one K(5), one Ta(4), and one Ta(5) atom. In the tenth O site, O(10) is bonded in a distorted linear geometry to one K(4), one K(5), two equivalent K(3), one Ta(2), and one Ta(4) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one K(3), one K(4), two equivalent K(2), one Ta(2), and one Ta(3) atom. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one K(2), one K(3), one K(5), one Ta(3), and one Ta(5) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one K(2), two equivalent K(1), one Ta(1), and one Ta(5) atom. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one K(3), one K(5), two equivalent K(1), one Ta(1), and one Ta(5) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to two equivalent K(3), two equivalent K(5), and two equivalent Ta(5) atoms. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to one K(1), two equivalent K(5), one Ta(1), and one Ta(3) atom.