在150℃水热条件下,用HMnO4氧化Mn(CH3COO)2,制备出了方形γ-MnOOH单晶.反应过程中使用HMnO4为氧化剂,不引入任何金属阳离子杂质.通过XRD、SEM、TEM、HRTEM、TG等方法研究发现,γ-MnOOH单晶的形成经过两个主要阶段:(1)反应初期生成γ-MnO2晶须;(2)在水热系统中,晶须按照吸附生长机理生长,由于各个晶面的表面能的不同,(11-1)晶面首先快速生长,再沿其他方向生长,形成方形y-MnOOH单晶.反应时间是影响晶体形态的主要因素.TG结果证明γ-MnOOH单晶在350℃下开始转化成MnO2.
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