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无水碳酸镁因为其重要的研究价值和广泛的应用而备受关注,因此探索无水碳酸镁的制备方法已经成为材料加工的一个重要课题.以二水草酸镁为起始原料,使用高温高压反应法成功地合成了高纯度的无水碳酸镁,对所得样品分别进行了粉末X射线衍射和Raman光谱的表征.通过热重分析以及尝试不同合成条件,给出了二水草酸镁-碳酸镁P-T相图并解释了高温高压合成碳酸镁的原理.利用偏光显微镜观察样品碳酸镁形貌、晶粒度以及晶体解理面,同时对样品的单晶粒做微区电子探针分析,给出了样品的镁含量.
Due to its important research value and wide application, anhydrous magnesium carbonate has attracted much attention, therefore it is an important issue to explore the preparation method of anhydrous magnesium carbonate.With magnesium oxalate dihydrate as the starting material, high temperature and pressure High-purity anhydrous magnesium carbonate was successfully synthesized by the reaction method, and the obtained samples were characterized by X-ray powder diffraction and Raman spectroscopy respectively.According to the thermogravimetric analysis and the attempt of different synthesis conditions, PT phase diagram and explain the principle of high temperature and high pressure synthesis of magnesium carbonate.Using polarized microscope to observe the sample morphology of magnesium carbonate, grain size and crystal cleavage plane, while the single crystal grain of the sample do micro-area electron probe analysis, given The sample’s magnesium content.