POM单晶生长动力学

Growth Kinetics of 3-Methyl-4-Nitropyridine-1-Oxide Single Crystals

本文在特定温度下使用静态体现显微法,测定了3-甲基-4-硝基吡啶-1-氧(简称POM)晶体在各种过饱和度σ的丙酮溶液中(201)、(210)等晶面的生长速率 R,然后将实验数据运用电子计算机归纳出 R 与σ的函数关系。同时对 BCF 面扩散模型的生长机理进行了探讨。发现过饱和度在1.5%以下时均能长出无宏观缺陷的 POM 单晶。

The growth rate(R)of 3-methyl-4-nitro-pyridine-1-oxide(POM)crystal faces as a function of supersaturation(σ)in acetone solutionat a specified temperature has been determined by stationary stereoscopicmicroscope method and the relationship between(R)and(σ)has beenobtained from the experimental data by electronic computer.The mechanismof crystal growth was explorated for BCF surface diffusion model.It wasfound that POM single crystals free from macrodefects can be grown atsupersaturations below 15%.