LixCoO2的电子phase diagram与恒电位脱嵌单晶的再研究
Electronic phase diagram of LixCoO2 revisited with potentiostatically de-intercalated single crystals
摘要：
用恒电位脱嵌单晶样品重新研究了LixCoO 2的电子相图。发现并分离出x ~ 0.87、0.72、0.53、0.50、0.43和0.33的稳定相用于物理性质研究。在10 K以下和200 K以下x分别为0.87和0.50的磁化率测量结果表明，样品中存在A型和链状反铁磁有序结构，与NaxCoO 2体系中的结果相似。同步辐射X射线劳厄衍射结果表明，在室温下，电子稳定相Li0.72CoO2没有Li空位超晶格有序.在x ~ 0.46-0.78的粉末样品中经常发现的~ 175 K附近的特殊磁异常不能通过这种单晶恒电位方法分离出来，这支持了先前提出的解释，即具有显著的热滞后和老化特性的表面稳定相。
英文摘要：
Electronic phase diagram of LixCoO2 has been re-examined using potentiostatically de-intercalated single crystal samples. Stable phases of x ~ 0.87, 0.72, 0.53, 0.50, 0.43, and 0.33 were found and isolated for physical property studies. A-type and chain-type antiferromagnetic orderings have been suggested from magnetic susceptibility measurement results in x ~ 0.87 and 0.50 below ~ 10 K and 200 K, respectively, similar to those found in NaxCoO2 system. There is no Li vacancy superlattice ordering observed at room temperature for the electronically stable phase Li0.72CoO2 as revealed by synchrotron X-ray Laue diffraction. The peculiar magnetic anomaly near ~ 175 K as often found in powder samples of x ~ 0.46-0.78 cannot be isolated through this single crystal potentiostatic method, which supports the previously proposed explanation to be surface stabilized phase of significant thermal hysteresis and aging character.
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