Abstract
Layered potassium cobaltate KxCoO2 withx = 0.36 has been successfully synthesized in KOHfluxes at 480 degrees C, and its hydrated formK0.36CoO2.yH2O (y⩽0.8) has been obtained byintercalation with water. The diffraction peaks of K0.36CoO2can be indexed by an orthorhombic cell similar toNa0.5CoO2, and K0.36CoO2.0.8H2O isisostructural with its sodium analog, monolayer hydrateNaxCoO2.yH2O. While the samples KxCoO2and K0.36CoO2yH2O (y<0.8) show semiconductorbehaviour, a metal-insulator transition around 30 K was observed in thesample KxCoO2.0.8H2O. Both the samples showcomplicated magnetic behaviour, and they are primarily paramagnetic inthe range from 5 K to 300 K with a spin-glass-like transition around56 K.
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