Low temperature synthesis of bilayer hydrated cesium cobalt oxide

摘要

Bilayer hydrated Na0.35CoO2.1.3H(2)O structure has re-directed superconductivity research in recent years. Here, we develop a low temperature synthesis method to prepare a novel hydrous Cs0.2CoO2.0.63H(2)O compound in one step. The bilayer-hydrate of Cs0.2CoO2.0.63H(2)O with a greatest interlayer spacing d = 10.0(2) angstrom among alkali cobalt oxides has been grown in crystal form. Magnetic susceptibility measurement of Cs0.2CoO2.0.63H(2)O displays a paramagnetic behavior down to 1.9 K. With the assistance of low temperature molten CsOH solvent, crystals of Rb0.30CoO2.0.36H(2)O and K0.35CoO2.0.4H(2)O can be grown. The results provide the capability for preparing a novel hydrous structure and the systematic investigation of interlayer coupling effect of alkali ion insertion compounds. (c) 2006 Elsevier Inc. All rights reserved.