Na3Mn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent Na(1), four equivalent Na(2), and four equivalent Mn(1) atoms to form distorted NaNa8Mn4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Mn4 cuboctahedra, edges with eight equivalent Na(1)Na8Mn4 cuboctahedra, edges with eight equivalent Mn(1)Na12 cuboctahedra, faces with four equivalent Mn(1)Na12 cuboctahedra, and faces with ten equivalent Na(1)Na8Mn4 cuboctahedra. In the second Na site, Na(2) is bonded in a distorted square co-planar geometry to eight equivalent Na(1) and four equivalent Mn(1) atoms. Mn(1) is bonded to four equivalent Na(2) and eight equivalent Na(1) atoms to form MnNa12 cuboctahedra that share corners with four equivalent Mn(1)Na12 cuboctahedra, edges with eight equivalent Mn(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Mn4 cuboctahedra, faces with four equivalent Mn(1)Na12 cuboctahedra, and faces with eight equivalent Na(1)Na8Mn4 cuboctahedra.
Na3Mn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to four equivalent Na(1), four equivalent Na(2), and four equivalent Mn(1) atoms to form distorted NaNa8Mn4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Mn4 cuboctahedra, edges with eight equivalent Na(1)Na8Mn4 cuboctahedra, edges with eight equivalent Mn(1)Na12 cuboctahedra, faces with four equivalent Mn(1)Na12 cuboctahedra, and faces with ten equivalent Na(1)Na8Mn4 cuboctahedra. All Na(1)-Na(1) bond lengths are 3.37 Å. All Na(1)-Na(2) bond lengths are 3.50 Å. All Na(1)-Mn(1) bond lengths are 3.50 Å. In the second Na site, Na(2) is bonded in a distorted square co-planar geometry to eight equivalent Na(1) and four equivalent Mn(1) atoms. All Na(2)-Mn(1) bond lengths are 3.37 Å. Mn(1) is bonded to four equivalent Na(2) and eight equivalent Na(1) atoms to form MnNa12 cuboctahedra that share corners with four equivalent Mn(1)Na12 cuboctahedra, edges with eight equivalent Mn(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Mn4 cuboctahedra, faces with four equivalent Mn(1)Na12 cuboctahedra, and faces with eight equivalent Na(1)Na8Mn4 cuboctahedra.