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六方结构的层状过渡金属化合物具有丰富的结构和物理现象,是近年来材料物理研究领域的一个热门课题[1~3]。层状过渡金属化合物的物理性能和晶体结构具有密切关联。例如,较大层间距的Na0·3CoO2·1·3H2O水合物为超导体[2];层间钠离子Z字形有序排列的Na0·5CoO2在50K附近发生电
Layered transition metal compounds with hexagonal structure are rich in structural and physical phenomena and are a hot topic in the field of material physics in recent years [1-3]. The physical properties and the crystal structure of the layered transition metal compounds are closely related. For example, Na0.3CoO2.1.3H2O hydrate with a larger interlayer spacing is a superconductor [2]; Na0.5CoO2 in which the inter-layer sodium ions are arranged in a zigzag manner occurs near 50K