碱式氯化镁晶须的水热合成及生长机理探讨  

Hydrothermal Synthesis and Growth Mechanism of Basic Magnesium Chloride Whiskers

作　　者：路绍琰[1] 马来波[1] 王俐聪[1] 骆碧君[1] 张亚南[1] 王玉琪[1] 王亮[1] 黄西平[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国家海水利用工程技术研究中心海水化学资源利用技术研究室,天津300192

出　　处：《人工晶体学报》2016年第1期170-175 186,186,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21276055);国家海洋局青年海洋科学基金(2012553);中央级公益性科研院所基本科研业务费团队项目(KJBYWF-2015-T08);天津市应用基础与前沿技术研究计划项目(14JCQNJC06500)

摘　　要：以六水氯化镁、氢氧化钠为原料,采用水热法合成碱式氯化镁晶须[9Mg(OH)_2·MgCl_2·5H_2,basic magnesium chloride,BMC],并分析了镁离子浓度、镁离子与氢氧化钠的摩尔比R、反应时间、反应温度对晶体制备的影响。用场发射扫描电镜、透射电镜、X射线衍射仪、选区衍射等对产物的形貌和组成进行表征。结果表明,180℃反应6h合成的BMC晶须长度为150μm以上,直径在0.5~1μm,长径比为150~400;BMC的生长实质上是以负离子配位多面体[Mg-(OH)_4]^(2-)及[Mg-Cl_4]^(2-)为生长结构基元,不同的晶体取向和叠合速度而形成的晶须。Using magnesium chloride hexahydrate and sodium hydroxide as raw materials,basic magnesium chloride[9Mg(OH)_2 ? MgCl_2 · 5H_2O,BMC]was prepared by the hydrothermal method.The influences of the magnesium concentration,the molar ratio R of magnesium ions to sodium hydroxide,reaction time and reaction temperature on the preparation of crystals were analyzed.The effect of reaction condition on the composition and morphology of products were investigated by scanning electron microscope,transmission electron microscope,X ray diffracmeter and selected-area diffraction.BMC whisker length is more than 150μm,0.5-1 μm in diameter,the length to diameter ratio 150-400 under reaction condition of 180 ℃,6 h.The growth of BMC is essentially formed by different crystal orientation and congruent speed with anion coordination polyhedrons[Mg-(OH)_4]^(2-) and[Mg-Cl_4]^(2-) as growth pattern primitives.

关 键 词：碱式氯化镁 晶须 水热合成 负离子配位多面体 

分 类 号：TQ132.2[化学工程—无机化工]