Abstract
The monolayer hydrate (MLH) K 0.3CoO 2·0.4H 2O was synthesized from K 0.6CoO 2 by extracting K + cations using K 2S 2O 8 as an oxidant and the subsequent intercalation of water between the layers of edge-sharing CoO 6 octahedra. A hexagonal structure (space group P6 3/ mmc) with lattice parameters a=2.8262(1) Å, c=13.8269(6) Å similar to the MLH Na 0.36CoO 2·0.7H 2O was established using high-resolution synchrotron X-ray powder diffraction data. The K/H 2O layer in the K-MLH is disordered, which is in contrast to the Na-MLH. At low temperatures metallic and paramagnetic behavior was found.
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