K5Na3Ta8O24 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal P4/mmm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form KO12 cuboctahedra that share corners with four equivalent K(3)O12 cuboctahedra, corners with eight equivalent Na(2)O12 cuboctahedra, faces with two equivalent Na(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. In the second K site, K(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form KO12 cuboctahedra that share corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent K(4)O12 cuboctahedra, corners with four equivalent Na(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with two equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. In the third K site, K(3) is bonded to four equivalent O(3) and eight equivalent O(2) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with eight equivalent Na(2)O12 cuboctahedra, faces with two equivalent K(4)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. In the fourth K site, K(4) is bonded to four equivalent O(4) and eight equivalent O(2) atoms to form KO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with four equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent O(4) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent K(4)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. In the second Na site, Na(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(4) atoms to form NaO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(3)O12 cuboctahedra, corners with four equivalent Na(2)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent K(4)O12 cuboctahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. Ta(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)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,  a faceface with one Na(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent Na(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one K(1), one K(3), two equivalent K(2), and two equivalent Ta(1) atoms. In the second O site, O(4) is bonded in a distorted linear geometry to one K(4), one Na(1), two equivalent Na(2), and two equivalent Ta(1) atoms. In the third O site, O(1) is bonded in a distorted linear geometry to one K(1), one K(2), one Na(1), one Na(2), and two equivalent Ta(1) atoms. In the fourth O site, O(2) is bonded in a distorted linear geometry to one K(2), one K(3), one K(4), one Na(2), and two equivalent Ta(1) atoms.
K5Na3Ta8O24 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal P4/mmm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form KO12 cuboctahedra that share corners with four equivalent K(3)O12 cuboctahedra, corners with eight equivalent Na(2)O12 cuboctahedra, faces with two equivalent Na(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All K(1)-O(3) bond lengths are 2.84 Å. All K(1)-O(1) bond lengths are 2.85 Å. In the second K site, K(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form KO12 cuboctahedra that share corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent K(4)O12 cuboctahedra, corners with four equivalent Na(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with two equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All K(2)-O(1) bond lengths are 2.85 Å. All K(2)-O(2) bond lengths are 2.84 Å. All K(2)-O(3) bond lengths are 2.84 Å. In the third K site, K(3) is bonded to four equivalent O(3) and eight equivalent O(2) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with eight equivalent Na(2)O12 cuboctahedra, faces with two equivalent K(4)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All K(3)-O(3) bond lengths are 2.84 Å. All K(3)-O(2) bond lengths are 2.85 Å. In the fourth K site, K(4) is bonded to four equivalent O(4) and eight equivalent O(2) atoms to form KO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(3)O12 cuboctahedra, faces with four equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All K(4)-O(4) bond lengths are 2.85 Å. All K(4)-O(2) bond lengths are 2.84 Å. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent O(4) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent K(4)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent Na(2)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All Na(1)-O(4) bond lengths are 2.83 Å. All Na(1)-O(1) bond lengths are 2.83 Å. In the second Na site, Na(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(4) atoms to form NaO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(3)O12 cuboctahedra, corners with four equivalent Na(2)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent K(4)O12 cuboctahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. All Na(2)-O(1) bond lengths are 2.83 Å. All Na(2)-O(2) bond lengths are 2.83 Å. All Na(2)-O(4) bond lengths are 2.84 Å. Ta(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)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,  a faceface with one Na(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, and faces with two equivalent Na(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. The Ta(1)-O(3) bond length is 2.02 Å. The Ta(1)-O(4) bond length is 2.00 Å. Both Ta(1)-O(1) bond lengths are 2.00 Å. Both Ta(1)-O(2) bond lengths are 2.01 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one K(1), one K(3), two equivalent K(2), and two equivalent Ta(1) atoms. In the second O site, O(4) is bonded in a distorted linear geometry to one K(4), one Na(1), two equivalent Na(2), and two equivalent Ta(1) atoms. In the third O site, O(1) is bonded in a distorted linear geometry to one K(1), one K(2), one Na(1), one Na(2), and two equivalent Ta(1) atoms. In the fourth O site, O(2) is bonded in a distorted linear geometry to one K(2), one K(3), one K(4), one Na(2), and two equivalent Ta(1) atoms.