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中文摘要：
采用高分辨X射线衍射技术对大尺寸磷酸二氢钾（KDP）晶体的晶格应变进行了测量，并定量分析了其晶格应力．探讨出KDP晶体容易沿着[001]方向发生开裂，与实际工作中的开裂现象相符合；进一步归纳总结了晶体生长过程中引入内应力而导致晶体开裂的主要因素．研究结果为提出相应的晶体防裂措施提供了重要的理论基础．
英文摘要：
The lattice strain of large-scale KDP crystal is characterized by using high resolution X-ray diffraction technique, and the lattice stress is analysed quantitatively in detail. The results indicate that KDP crystal may cleave easily along the [001] direction, which corresponds to the cracking phenomenon in the practical work. The major factors of introducing the internal stress and causing crack in the crystal growth process are summarized. Those conclusions provide important theoretical basis for proposing crack control measures of the large-scale KDP crystals.
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