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利用熔融KOH和Co3O4在较低温度(480℃)下反应制备出K0.36CoO2,然后用高锰酸钾溶液和饱和的过硫酸钾溶液进行氧化处理.氧化的同时伴随有水分子嵌入.K0.36CoO2用高锰酸钾和过硫酸钾溶液处理后分别得到K0.12CoO2.0.8H2O和K0.16CoO2.0.6H2O.这两种化合物都属于六角晶系,表现出金属行为,脱水后主相变为正交结构并且呈现出半导体特性.K0.16CoO2.0.6H2O在56K附近可能存在自旋玻璃转变行为或其他涨落.随着钾含量的减少和水含量的增多,样品的自旋玻璃行为受到抑制或发生磁性相分离.样品K0.12CoO2.0.8H2O在零场冷却和有场冷却曲线上的分叉现象基本上消失.还讨论了产生KxCoO2与NaxCoO2体系结构和物性差别的原因.
K0.36CoO2 was prepared by the reaction of molten KOH and Co3O4 at a lower temperature (480 ℃), and then oxidized by potassium permanganate solution and saturated potassium persulfate solution, accompanied by oxidation of water molecules embedded in K0.36CoO2. 36CoO2 treated with potassium permanganate and potassium persulfate solution obtained respectively K0.12CoO2.0.8H2O and K0.16CoO2.0.6H2O These two compounds belong to the hexagonal system, showing the metal behavior, the main phase after dehydration becomes Orthorhombic structure and exhibit semiconducting properties.K0.16CoO2.0.6H2O may exhibit spin-glass transition behavior or other fluctuations near 56 K. With the decrease of potassium content and the increase of water content, the spin-glass behavior of the sample is inhibited Or magnetic phase separation occurs.The bifurcation of sample K0.12CoO2.0.8H2O on the zero-field cooling and field cooling curves basically disappears.The reason why the structure and properties of KxCoO2 and NaxCoO2 are different is also discussed.