Unique [Mn6Bi5]− Nanowires in KMn6Bi5: A Quasi-One-Dimensional Antiferromagnetic Metal

We report a new quasi-one-dimensional compound KMn6Bi5 composed of parallel nanowires crystallizing in a monoclinic space group C2/m with a = 22.994(2) A, b = 4.6128(3) A, c = 13.3830(13) A and β = 124.578(6)°. The nanowires are infinite [Mn6Bi5]− columns each of which is composed of a nanotube of Bi atoms acting as the cladding with a nanorod of Mn atoms located in the central axis of the nanotubes. The nanorods of Mn atoms inside the Bi cladding are stabilized by Mn–Mn bonding and are defined by distorted Mn-centered cluster icosahedra of Mn13 sharing their vertices along the b axis. The [Mn6Bi5]− nanowires are linked with weak internanowire Bi–Bi bonds and charge balanced with K+ ions. The [Mn6Bi5]− nanowires were directly imaged by high-resolution transmission electron microscopy and scanning transmission electron microscopy. Magnetic susceptibility studies show one-dimensional characteristics with an antiferromagnetic transition at ∼75 K and a small average effective magnetic moment (1.56 μB/Mn for H...