炸药多晶相的普遍存在和晶相转变显著影响武器系统的安全性、可靠性和做功能力。探索相变机理并进行有效的相变抑制对保证炸药部件的稳定性和能量效能的最大利用具有非常重要的意义。本项目针对典型低感高能炸药FOX-7，采用单晶XRD等多种原位技术对FOX-7热致相变行为和动力学过程进行研究，并结合理论模拟，从微观层次探索FOX-7晶体α→β热致相变机理。在此基础上，基于异质界面晶格匹配和表面构型匹配相结合模式，采用溶液共结晶等方法制备相稳定剂/FOX-7掺杂结构和FOX-7@聚合物核壳结构材料，实现FOX-7的α→β相变抑制；并采用XAFS，XRD和TG-DSC等技术研究两者的物相组成和精细结构随温度的演变规律，揭示其抑制机理。本项目的研究成果不仅将显著改善FOX-7的热安全性，极大地扩展其应用范围，而且对于其它多晶相炸药和有机晶体的相变机理和抑制研究也具有很好的指导意义。

The polymorphism and phase transition of explosives have an important influence on the safety, reliability and performance of the explosive components in weapon system. Clarifying phase transition mechanism and inhibiting phase transformation are fundamental to guarantee structure stability and efficiency of explosive assembly. This project focuses on a typical low sensitive high energetic explosive, FOX-7. Combining various in-situ techniques and theoretical simulations and calculations, we will reveal the mechanism of α→β thermal phase transition of FOX-7 on the atomic and molecular levels. According to the principle of the lattice and configuration match among heterogeneous interfaces, we’ll prepare doped phase stabilizer/FOX-7 materials and FOX-7@polymer core-sheet structure materials using solution co-crystallization method to inhibit the α→β phase transformation, and investigate their phase composition and fine structures evolution during the FOX-7 phase transition by synchrotron radiation XAFS, XRD and TG-DSC techniques, which will provide a more accurate and comprehensive understanding of the mechanism of the phase transformation inhibition. This finding is expected to enhance the thermal stability and environmental suitability of FOX-7 and expand its application scope. Besides, the results may benefit the research of the phase transition mechanism and phase transformation inhibition behavior of other polymorphic explosives and organic crystals。