碱式氯化镁晶须的水热制备及热分解机理研究  

Hydrothermal Synthesis and Thermal Decomposition Mechanism of Basic Magnesium Chloride Whiskers

作　　者：路绍琰[1] 武海虹[1] 吴丹[1] 马来波[1] 张慧峰[1] 姚颖[1] 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《稀有金属材料与工程》2016年第2期482-486,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金面上项目(21276055);国家海洋局青年海洋科学基金资助项目(2012553);中央级公益性科研院所基本科研业务费专项资金项目(K-JBYWF-2011-G22;K-JBYWF-2013-G9)

摘　　要：采用水热法以氯化镁溶液、氢氧化钠为原料制备了碱式氯化镁晶须。通过SEM和SAED观察样品的显微形貌及晶体结构,晶须长度150μm以上,直径0.5~1μm,为单晶物质。通过XRD测定样品的晶相结构,产物为碱式氯化镁9Mg（OH）2·MgCl2·5H2O。通过红外光谱考察了不同镁离子浓度产物官能团的不同。升温速率为2~5℃/min,高温程序煅烧前驱体碱式氯化镁,制备出氧化镁晶须,很好的保持了碱式氯化镁晶须的形貌,仍为单晶物质,并推测了其可能的热分解的机理过程。Basic magnesium chloride whiskers were prepared with saltworks brine and sodium hydroxide as starting materials.Morphology and crystal structure of the products were investigated by SEM and SAED.Crystalline structure of the samples was determined by XRD and their functional groups of different magnesium ion concentrations were investigated by FT-IR.The results show that the whiskers are of single crystal with the average diameter of 0.5~1 μm and length of more than 150 μm.The product is9Mg（OH）2·MgCl2·5H2O.Magnesium oxide whiskers are obtained by high temperature program calcination at the heating rate of2~5 ℃/min,which can keep the morphology and single crystal structure of basic magnesium oxide whiskers well.The possible mechanism of thermal decomposition process was also speculated.

关 键 词：晶须 碱式氯化镁 氧化镁 单晶 

分 类 号：TQ132.2[化学工程—无机化工]