K2NaNbO2F4 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to four equivalent O(1) and eight equivalent F(1) atoms to form KO4F8 cuboctahedra that share corners with twelve equivalent K(1)O4F8 cuboctahedra, faces with six equivalent K(1)O4F8 cuboctahedra, faces with four equivalent Na(1)O2F4 octahedra, and faces with four equivalent Nb(1)O2F4 octahedra. Na(1) is bonded to two equivalent O(1) and four equivalent F(1) atoms to form NaO2F4 octahedra that share corners with six equivalent Nb(1)O2F4 octahedra and faces with eight equivalent K(1)O4F8 cuboctahedra. The corner-sharing octahedra are not tilted. Nb(1) is bonded to two equivalent O(1) and four equivalent F(1) atoms to form NbO2F4 octahedra that share corners with six equivalent Na(1)O2F4 octahedra and faces with eight equivalent K(1)O4F8 cuboctahedra. The corner-sharing octahedra are not tilted. O(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Nb(1) atom. F(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Nb(1) atom.
K2NaNbO2F4 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to four equivalent O(1) and eight equivalent F(1) atoms to form KO4F8 cuboctahedra that share corners with twelve equivalent K(1)O4F8 cuboctahedra, faces with six equivalent K(1)O4F8 cuboctahedra, faces with four equivalent Na(1)O2F4 octahedra, and faces with four equivalent Nb(1)O2F4 octahedra. All K(1)-O(1) bond lengths are 3.09 Å. All K(1)-F(1) bond lengths are 3.04 Å. Na(1) is bonded to two equivalent O(1) and four equivalent F(1) atoms to form NaO2F4 octahedra that share corners with six equivalent Nb(1)O2F4 octahedra and faces with eight equivalent K(1)O4F8 cuboctahedra. The corner-sharing octahedra are not tilted. Both Na(1)-O(1) bond lengths are 2.36 Å. All Na(1)-F(1) bond lengths are 2.31 Å. Nb(1) is bonded to two equivalent O(1) and four equivalent F(1) atoms to form NbO2F4 octahedra that share corners with six equivalent Na(1)O2F4 octahedra and faces with eight equivalent K(1)O4F8 cuboctahedra. The corner-sharing octahedra are not tilted. Both Nb(1)-O(1) bond lengths are 1.89 Å. All Nb(1)-F(1) bond lengths are 2.04 Å. O(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Nb(1) atom. F(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Nb(1) atom.