【摘要】 对三联苯是一种常见的有机闪烁剂,通常用作闪烁计数器的发光材料。对三联苯闪烁晶体具有对中子探测效率高以及不易潮解等特性,这使其在实际应用中具有广阔的前景。本文采用坩埚下降法,使用单层安瓿成功生长出?12 mm×30 mm对三联苯晶体。在生长开始前通过差热分析,确定晶体的生长温度。生长完成后测试了晶体粉末的X射线衍射谱、摇摆曲线、红外光谱、荧光光谱和拉曼光谱。X射线衍射结果表明,生长的晶体为纯对三联苯相。从摇摆曲线结果可以看出,生长晶体质量良好。红外和拉曼分析结果显示,峰位并没有出现明显的偏移,表明晶体中杂质含量较少并未引起晶体分子化学结构的变化。荧光光谱没有杂质峰的出现也说明对三联苯晶体存在较少杂质或晶格缺陷。更多还原

【Abstract】 p-Terphenyl is a common organic scintillator, which is usually used as the luminescent material in scintillation counters. The p-terphenyl scintillation crystal has the characteristics of high neutron detection efficiency and not easy to deliquesce, which makes it have a broad prospect in practical applications. In this paper, the vertical Bridgman method was used, and the ?12 mm×30 mm p-terphenyl scintillation crystal has grown using a single layer ampoule. The growth temperature of the crystals was determined by differential thermal test. The crystalline powder were measured by X-ray diffraction spectra, rocking curve, FT-IR spectra, fluorescence spectra and Raman spectra. The X-ray diffraction results show that the grown crystals are pure p-terphenyl phase. The rocking curve results show that the quality of the p-terphenyl crystal is good. FT-IR and Raman results show no significant shift in the peak positions, indicating that the low content of impurities in the crystals and no changement in the molecular chemical structure of the crystals. The absence of impurity peaks in the fluorescence spectra also indicates the presence of fewer impurities or crystal lattice defects in the p-terphenyl scintillation crystal.更多还原