  The monolayer hydrate (MLH) K03CoO2 x 04H2O was synthesized from K06CoO2 by
extracting K+ cations using K2S2O8 as an oxidant and the subsequent
intercalation of water between the layers of edge-sharing CoO6 octahedra. A
hexagonal structure (space group P63/mmc) with lattice parameters a = 2.8262(1)
Angstrom, c = 13.8269(6) Angstrom similar to the MLH Na036CoO2 x 07H2O was
established using high-resolution synchrotron X-ray powder diffraction data.
The K/H2O layer in the K-MLH is disordered, which is in contrast to the Na-MLH.
At low temperatures metallic and paramagnetic behavior was found.
