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大长径比三水碳酸镁晶须的制备及晶体生长机理
作者:王余莲1 2 印万忠2 张夏翔3 唐宏欣1 戴绍书1 
单位:(1. 沈阳理工大学材料科学与工程学院 沈阳 110159 2. 东北大学资源与土木工程学院 沈阳 110819  3. 湖南大学材料科学与工程学院 长沙 410082) 
关键词:菱镁矿 三水碳酸镁 晶须 大长径比 生长机理 
分类号:TD989
出版年,卷(期):页码:2018,46(7):0-0
DOI:
摘要:

 以菱镁矿为原料,十二烷基硫酸钠(SDS)为添加剂,采用水化碳酸化法?低温水溶液法制备了大长径比三水碳酸镁(MgCO3·3H2O)晶须。对产物物相组成、形貌和热化学过程进行表征,探讨Mg(HCO3)2溶液pH值和SDS用量对产物晶体形态的影响,研究MgCO3·3H2O晶体结构,并分析晶须生长机制。结果表明:Mg(HCO3)2溶液pH值为7.3±0.2,SDS用量为5.0 g/L时,可得到平均长度150 μm、长径比达50的棒状MgCO3·3H2O晶须。MgCO3·3H2O与4MgCO3·Mg(OH)2·4H2O的热化学过程类似,分解产物均为MgO、CO2和H2O。MgCO3·3H2O晶须生长是螺型位错延伸的结果,结晶过程中,[MgO6]正八面体生长基元通过Mg?O键以共顶点的方式沿[010]方向自组装并快速生长。

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