K2NaMnF6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Na(1)F6 octahedra, and faces with four equivalent Mn(1)F6 octahedra. Na(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form NaF6 octahedra that share corners with six equivalent Mn(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Mn(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form MnF6 octahedra that share corners with six equivalent Na(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Mn(1) atom. In the second F site, F(2) is bonded to four equivalent K(1), one Na(1), and one Mn(1) atom to form a mixture of distorted edge and corner-sharing FK4NaMn octahedra. The corner-sharing octahedral tilt angles range from 0-3°.
K2NaMnF6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, faces with four equivalent Na(1)F6 octahedra, and faces with four equivalent Mn(1)F6 octahedra. All K(1)-F(2) bond lengths are 2.94 Å. All K(1)-F(1) bond lengths are 3.02 Å. Na(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form NaF6 octahedra that share corners with six equivalent Mn(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Na(1)-F(2) bond lengths are 2.26 Å. All Na(1)-F(1) bond lengths are 2.25 Å. Mn(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form MnF6 octahedra that share corners with six equivalent Na(1)F6 octahedra and faces with eight equivalent K(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Mn(1)-F(2) bond lengths are 2.11 Å. All Mn(1)-F(1) bond lengths are 1.91 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to four equivalent K(1), one Na(1), and one Mn(1) atom. In the second F site, F(2) is bonded to four equivalent K(1), one Na(1), and one Mn(1) atom to form a mixture of distorted edge and corner-sharing FK4NaMn octahedra. The corner-sharing octahedral tilt angles range from 0-3°.