晶体的晶型和形貌是碳酸钙制备中的关键问题之一.采用尿素水解均匀沉淀法来控制碳酸钙的晶型和形貌.利用XRD和SEM等技术手段对CaCO3晶体的结构和形貌进行了表征.结果表明,高温条件下(90℃)水溶液中得到均匀的针状结构的文石晶体.添加适量柠檬酸钠后,则得到的是特殊形貌的方解石晶体.在乙醇/水混合溶剂中,柠檬酸钠对CaCO3晶体的形貌也有重要影响,通过改变乙醇体积分数,得到了中空绒毛球状的球霰石.
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