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Synthesis and structure transformation of ion-exchanged metal cobalt oxides

机译:离子交换金属钴氧化物的合成及结构转变

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A room-temperature ion exchage reaction to synthesize a series of A(x)CoO(2)center dot yH(2)O crystalline compounds has been demonstrated. The ion exchange reactions with the bilayer hydrate (BLH) Cs0.29CoO2 center dot 1.12H(2)O structure have been studied for a guest ion consisting of Li+, Na+, K+, Rb+, and Ag+. The experimental results reveal that only the ion-exchanged Na+-BLH displayed 4.2 K superconductivity and that the products' structural stability was highly sensitive to the guest ion. The substitution of Rb+, K+, or Li+ stimulates the phase transformation from BLH to a monolayer hydrate (MLH) structure. Ion exchange of Ag+ ions can synthesize the silver-deficient dehydrated compound. Structures of solvated alkali cation, intermolecular, and intramolecular hydrogen bonds are correspondingly demonstrated to be the determining factors for holding the BLH structure.
机译:已经证明了室温离子交换反应可合成一系列A(x)CoO(2)中心点yH(2)O晶体化合物。已经研究了由Li +,Na +,K +,Rb +和Ag +组成的客体离子与双层水合物(BLH)Cs0.29CoO2中心点1.12H(2)O结构的离子交换反应。实验结果表明,只有离子交换的Na + -BLH表现出4.2 K超导性,并且产物的结构稳定性对客体离子高度敏感。 Rb +,K +或Li +的取代会刺激从BLH到单层水合物(MLH)结构的相变。 Ag +离子的离子交换可以合成缺银的脱水化合物。相应地证明了溶剂化的碱性阳离子,分子间和分子内氢键的结构是保持BLH结构的决定性因素。

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