水热条件下不同形貌和晶相碳酸钙的形成和转化

发布时间：2018-03-16 22:39

本文选题：碳酸钙　切入点：晶体形貌　出处：《人工晶体学报》2016年07期 　论文类型：期刊论文

【摘要】：利用碳酸氢钙水热分解制备了具有不同形貌和晶相的碳酸钙。在水热情况下,得到了多种形貌的方解石和霰石碳酸钙,研究了碳酸氢钙浓度、添加剂氯化镁浓度、反应时间和温度等对碳酸钙形貌和晶相的影响。以X射线衍射(XRD)和扫描电镜(SEM)对制备的碳酸钙进行了表征。研究发现,水热条件对碳酸钙形貌和晶相的形成以及演化过程有重要影响。水热条件下发现了稳定的碳酸钙晶相向亚稳定相转化的反常相变,对相关的形成及转化机理进行了相应的阐述。
[Abstract]:Calcium carbonate with different morphologies and crystalline phases was prepared by hydrothermal decomposition of calcium bicarbonate. Calcite and aragonite calcium carbonate with various morphologies were obtained under hydrothermal conditions. The concentration of calcium bicarbonate and the additive magnesium chloride were studied. The effects of reaction time and temperature on the morphology and crystal phase of calcium carbonate were studied. The prepared calcium carbonate was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Hydrothermal conditions have an important influence on the morphology of calcium carbonate and the formation and evolution of crystalline phase. The abnormal phase transition from stable calcium carbonate to metastable phase has been found under hydrothermal conditions, and the related formation and transformation mechanism have been explained accordingly.
【作者单位】：河南师范大学化学化工学院;
【基金】：河南省高等学校重点科研项目基金(15A150058) 国家自然科学基金(21303044,21303043)
【分类号】：TQ132.32

【相似文献】