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基于二水草酸镁(MgC2O42H2O)的无水碳酸镁(MgCO3)的高压制备和表征

梁文 李泽明 王璐颖 陈琳 李和平

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基于二水草酸镁(MgC2O42H2O)的无水碳酸镁(MgCO3)的高压制备和表征

梁文, 李泽明, 王璐颖, 陈琳, 李和平

High pressure synthesis of anhydrous magnesium carbonate (MgCO3) from magnesium oxalate dihydrate (MgC2O42H2O) and its characterization

Liang Wen, Li Ze-Ming, Wang Lu-Ying, Chen Lin, Li He-Ping
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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.
    Stimulated by the extensive application and research value, the study of anhydrous magnesium carbonate (MgCO3) has been a subject of great concern recently, so that a basic problem in designing a method of effectively synthesizing MgCO3 is very worth considering. In previous studies, different methods were reported to synthesize MgCO3 successfully but they still have some obvious deficiencies. The micro-particle sizes are too small to satisfy the basic requirements of micro-analysis. Thus, it is needed to explore the new methods of artificially synthesizing MgCO3 with the simple process and the high efficiency. By using magnesium oxalate dihydrate (MgC2O42H2O) as starting material, MgCO3 sample is successfully synthesized by a solid reaction under high temperature and high pressure for the first time in this work. The properties of as-synthesized sample are investigated by X-ray powder diffraction and Raman spectroscopy:neither of them shows any impurities existing in the sample. Significantly, the crystallinity quality is greatly improved in the terms of the maximum grain sizes up to 200 micrometers, which could provide a base for MgCO3 single crystal growth in the future. Moreover, compared with the results of previous studies, the reaction time of high pressure synthesis is controlled within 1 h so that the efficiency of the synthesis is greatly improved. Based on thermogravimetric analyses and the results of high pressure experiment under the various pressures and temperatures, the P-T phase diagrams of MgC2O42H2O-MgCO3-MgO at high pressures of 0.5, 1.0 and 1.5 GPa are obtained, and in this case, it is reasonable to explain the principle of MgCO3 synthesis under high pressure strictly. From the P-T diagram, high pressure can greatly improve the thermal stability of material, and the decomposition temperature of MgCO3 obviously increases with pressure increasing. However, due to decomposition temperature of MgCO3 increasing more quickly than that of MgCO42H2O, the stable phase regions of MgC2O42H2O and MgCO3 are separated from each other, and hence, the corresponding temperature and pressure can be controlled to decompose the phase of MgC2O42H2O while stabilizing the phase of MgCO3 so as to obtain MgCO3 successfully. Besides, by using polarizing microscope, the morphology of MgCO3 sample as well as its crystal cleavage plane (1011) is observed clearly, and it is noted that as-synthesized MgCO3 has good optical properties and high-quality crystallinity. The electron probing analysis for MgCO3 thin section is performed to quantify the Mg content and the calculation indicates that the sample composition is Mg0.99CO3.
      通信作者: 李和平, liheping@vip.gyig.ac.cn
    • 基金项目: 中国科学院地球化学研究所135项目、国家重点研究发展计划(批准号:2016YFC0600100)和中国科学院重大科研装备研制项目(批准号:YZ200720)资助的课题.
      Corresponding author: Li He-Ping, liheping@vip.gyig.ac.cn
    • Funds: Project supported by the 135 Program of the Institute of Geochemistry, Chinese Academy of Sciences, the National Key Research and Development Plan of China (Grant No. 2016YFC0600100), and the Large-scale Scientific Apparatus Development Program, Chinese Academy of Sciences (Grant No. YZ200720).
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    Herman R G, Bogdan C E, Sommer A J, Simpson D R 1987 Appl. Spectrosc. 41 437

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    Rividi N, van Zuilen M, Philippot P, Menez B, Godard G, Poidatz E 2010 Astrobiology 10 293

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出版历程
  • 收稿日期:  2016-09-22
  • 修回日期:  2016-10-11
  • 刊出日期:  2017-02-05

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