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Toward efficient crystal growth of 4-(NN-dimethylamino) -3-acetamidonitrobenzene (DAN) in space: vapor pressure measurements and growth morphology studies

机译:在空间中实现4-(NN-二甲基氨基)-3-乙酰氨基硝基苯(DAN)的有效晶体生长:蒸气压测量和生长形态研究

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Abstract: DAN, 4-(N,N-dimethylamino)-3-acetamidonitrobenzene is an organic nonlinear optical material with particularly high polarizability of the molecule. In order to provide a sound base for the optimization of (flight) crystal growth experiments, we have performed vapor pressure measurements with DAN, and studied the growth morphology at various temperatures. Vapor pressure data were obtained between 50 and 140 degrees C, employing a specially designed, non- contaminating, and computer-controlled experimental set-up. Thermal decomposition of DAN was found to set in around 90 degrees C. Crystal growth morphologies were monitored by optical microscopy at various temperatures. Smoothly faceted growth, indicating adequate surface mobility of adatoms, was obtained at temperatures above 115 degrees C. As a consequence, for crystal growth at this high temperature, continuous removal of decomposition products is required to sustain practical growth rates. !12
机译:摘要:DAN,4-(N,N-二甲基氨基)-3-乙酰氨基硝基苯是一种有机非线性光学材料,具有特别高的分子极化性。为了提供用于优化(飞行)晶体生长实验的声源,我们已经用DAN进行了蒸气压测量,并研究了各种温度的生长形态。在50至140摄氏度之间获得蒸汽压力数据,采用专门设计的非污染和计算机控制的实验设置。发现DAN的热分解在各种温度下通过光学显微镜监测晶体生长形态约90摄氏度。在115℃的温度下,在温度下获得平稳的刻划生长,表明吸附剂的足够表面迁移率。因此,对于在该高温下进行晶体生长,需要连续去除分解产物以维持实际增长率。 !12

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