Synthesis and Structure of the Monolayer Hydrate K03CoO2 x 04H2O
S. Park, Y. Lee, W. Si, and T. Vogt
TL;DR
This paper reports the synthesis and structural analysis of a monolayer hydrate K3CoO2·0.4H2O, revealing its hexagonal structure, disordered K/H2O layers, and metallic, paramagnetic properties at low temperatures.
Contribution
It introduces a new monolayer hydrate K3CoO2·0.4H2O synthesized via oxidation and water intercalation, with detailed structural characterization.
Findings
Hexagonal crystal structure confirmed by synchrotron X-ray diffraction
Disordered K/H2O layers differ from sodium analogs
Metallic and paramagnetic behavior observed at low temperatures
Abstract
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.
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