KTbEuNbO6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal P4_2/mmc space group. K(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with eight equivalent Eu(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. Tb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-7°. Eu(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form EuO12 cuboctahedra that share corners with four equivalent Eu(1)O12 cuboctahedra, corners with eight equivalent K(1)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with four equivalent K(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. Nb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-7°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent K(1), one Tb(1), two equivalent Eu(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent K(1), one Tb(1), two equivalent Eu(1), and one Nb(1) atom.
KTbEuNbO6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal P4_2/mmc space group. K(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with eight equivalent Eu(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. All K(1)-O(2) bond lengths are 3.00 Å. All K(1)-O(1) bond lengths are 3.08 Å. Tb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-7°. Both Tb(1)-O(2) bond lengths are 2.22 Å. All Tb(1)-O(1) bond lengths are 2.24 Å. Eu(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form EuO12 cuboctahedra that share corners with four equivalent Eu(1)O12 cuboctahedra, corners with eight equivalent K(1)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with four equivalent K(1)O12 cuboctahedra, faces with four equivalent Tb(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. All Eu(1)-O(2) bond lengths are 3.00 Å. All Eu(1)-O(1) bond lengths are 2.91 Å. Nb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-7°. Both Nb(1)-O(2) bond lengths are 1.99 Å. All Nb(1)-O(1) bond lengths are 2.02 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent K(1), one Tb(1), two equivalent Eu(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent K(1), one Tb(1), two equivalent Eu(1), and one Nb(1) atom.