水溶性晶体生长的原位环境扫描电镜研究  

In-situ Study of Hydrated-Crystal Growth with Environmental Scanning Electron Microscopy

作　　者：张隐奇[1] 卫斌[1] 王丽[1] 吉元[1] 

机构地区：[1]北京工业大学固体微结构与性能研究所,北京100124

出　　处：《真空科学与技术学报》2012年第6期524-528,共5页Chinese Journal of Vacuum Science and Technology

基　　金：北京市高层次人才计划资助项目(PHR20100503);北京市优秀博士学位论文指导教师资助项目

摘　　要：采用环境扫描电镜（ESEM）,原位观察了水溶性晶体NaCl和KH2PO4的溶解-结晶过程。研究了ESEM的水湿环境（压力、温度及相对湿度φ）对水溶性晶体结晶形态的影响。通过控制φ值及水蒸汽的蒸发-凝结状态,在600-650 Pa、1-2℃和φ为91%-95%的条件下,形成四方柱和四方锥组合体特征的KH2PO4单晶。采用接近水的饱和蒸汽压曲线的压力和温度的组合条件,得到具有规则晶形的KH2PO4单晶体。The growth of hydrated crystals, NaCl and KH2PO4, was in-situ characterized with environmental scanning electron microscopy. The influence of the aqueous environment, including the pressure, temperature, and relative humidity, 9, on its microstructures were studied with X-ray diffraction,and environmental scanning electron microscope. The results show that the highly crystalline KH2PO4 crystals grains, a square column jointed with a square cone,can be grown by controlling the relative humidity and the evaporation-condensation states of water vapor, at a temperature of 1 - 2℃, a pressure of 600 - 650 Pa, and a relative humidity φ of 91% - 95%. Under the optimized conditions,at a pressure and a temperature,closed to those in the standard saturated water vapor curve,the cubic structured KH2PO4 grains were grown.

关 键 词：环境扫描电镜 原位 水湿环境 KH2PO4 

分 类 号：TN16[电子电信—物理电子学] TB79[一般工业技术—真空技术]