KEuNbBiO6 crystallizes in the orthorhombic Pnnn space group. There are two inequivalent K sites. In the first K site, K(1) 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 Eu(1)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(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(1)O12 cuboctahedra, corners with four equivalent Eu(1)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. In the second Eu site, Eu(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Eu(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, and faces with two equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-9°. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, and faces with two equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-9°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom.
KEuNbBiO6 crystallizes in the orthorhombic Pnnn space group. There are two inequivalent K sites. In the first K site, K(1) 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 Eu(1)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. All K(1)-O(1) bond lengths are 3.18 Å. All K(1)-O(2) bond lengths are 3.09 Å. All K(1)-O(3) bond lengths are 2.95 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(1)O12 cuboctahedra, corners with four equivalent Eu(1)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. All K(2)-O(1) bond lengths are 2.93 Å. All K(2)-O(2) bond lengths are 3.21 Å. All K(2)-O(3) bond lengths are 3.09 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Eu(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(2)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. All Eu(1)-O(1) bond lengths are 3.06 Å. All Eu(1)-O(2) bond lengths are 2.88 Å. All Eu(1)-O(3) bond lengths are 3.14 Å. In the second Eu site, Eu(2) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Eu(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Nb(1)O6 octahedra, and faces with four equivalent Bi(1)O6 octahedra. All Eu(2)-O(1) bond lengths are 3.05 Å. All Eu(2)-O(2) bond lengths are 3.01 Å. All Eu(2)-O(3) bond lengths are 3.01 Å. Nb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NbO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, and faces with two equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-9°. Both Nb(1)-O(1) bond lengths are 2.02 Å. Both Nb(1)-O(2) bond lengths are 2.04 Å. Both Nb(1)-O(3) bond lengths are 2.02 Å. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Eu(1)O12 cuboctahedra, and faces with two equivalent Eu(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-9°. Both Bi(1)-O(1) bond lengths are 2.28 Å. Both Bi(1)-O(2) bond lengths are 2.29 Å. Both Bi(1)-O(3) bond lengths are 2.29 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one Eu(1), one Eu(2), one Nb(1), and one Bi(1) atom.