电光晶体硒酸氢铷(RHSe)的生长动力学

Growth Mechanism of Rubidium Hydrogen Selenate Crystal

本文采用动态循环观察法测量了RHSe晶体在水溶液中不同过饱和度下主要显露晶面的生长速率。结果表明 ,RHSe晶体主要显露晶面的生长机制是多二维成核生长机制 ,在饱和点为38.0 0℃的溶液中 ,RHSe晶体的 { 111}和 { 10 1}晶面的临界过饱和度分别为 1.0 1%和 1.16 %。实验过程中还发现 ,当过饱和度大于 1.76 %时 ,晶体生长速率太快而出现宏观缺陷 ,因而在生长RHSe单晶时 ,过饱和度应控制在 1.76

The growth rates of main revealable faces of rubidium hydrogen selenate(RbHSeO 4) crystal in supersaturation aqueous solution were measured by dynamics cycle observation method,and the result of experiment showed that the growth mechanism of these faces was typical multiple two dimensional nucleation growth.When the saturation point of the RHSe solution is 38.00℃,the critical supersaturation of the forms{111}and {101}are respectively σ * {111}=1.01% and σ * {101}=1.16%.We found that the macroscopic defects were appeared when the crystal growth rate was high.Therefore,we suggest that the supersaturation for growing RHSe single crystal should be lower than 1.76%.