α-Fe_2O_3的水热法合成及其相形成机理

Synthesis and Phase Formation Mechanism of α-Fe_2O_3 Powders by Hydrothermal Reaction Method

以分析纯硝酸铁为原料,苛性钾为矿化剂,采用水热反应法合成了α-Fe2O3。利用XRD、TEM、SEAD对产物的物相和微观形貌进行了表征,研究了水热反应时间对物相形成和微观形貌的影响。结果显示,在高温高压下首先形成纳米线状的α-FeOOH,然后随时间的延长α-FeOOH进一步脱水,形成颗粒状α-Fe2O3粉体。并提出了α-FeOOH转化为α-Fe2O3的相形成机理。

α-Fe2O3 was synthesized by hydrothermal reaction method using Fe（NO3）3·9H2O as starting materials and caustic potash as mineralizer. The powders were characterized by XRD, TEM and SEDA for investigating the effects of reaction time on phase formation and morphology. The results show that α-FeOOH nanowires were formed firstly under high temperature and high-pressure conditions, and then the particle-like α-Fe2O3 powders were obtained because of the dehydration of α-FeOOH as the hydrothermal reaction time increasing The phase formation mechanism of α-Fe2O3 from α-FeOOH was discussed in this paper.