Sensitivity is one of the greatest concerns in explosive materials, and its underlying mechanism remains ambiguous. In this study, 2,6-diamino-3,5- dinitropyrazine -1-oxide (LLM-105) crystals with different morphologies, such as crosswise, needle, plate, block, diamond, and spherical shapes, were prepared using a solution crystallization method, and their crystal characteristics and sensitivity were investigated. It was found that the H₅₀ values (impact sensitivity) of LLM-105 vary within an extremely wide range of 33.8–112.2 cm and are mainly influenced by the particle morphology, crystal integrity, particle surface defects, and roughness, but are mostly independent of intracrystalline defects and particle sizes. The friction sensitivities of all samples are zero and are unaffected by the crystal characteristics. The G₅₀ values (shock sensitivity) are within the range of 0–6.9 mm, increasing with decreasing particle sizes and the apparent crystal density. Notably, LLM-105 crystals with a spherical shape, good integrity, smooth surface, and fewer defects are insensitive to impact and shock impulse. The relationships between the crystal characteristics and the sensitivity of LLM-105 are extremely complex and show some abnormal phenomena, which can be attributed to the crystal packing style and aggregated microstructures of LLM-105.

敏感性是爆炸性材料中最大的关注之一，其潜在机制仍然不明确。在这项研究中，使用溶液制备了具有不同形态（如横向，针状，板状，块状，菱形和球形）的2,6-二氨基-3,5-二硝基吡嗪-1-氧化物（LLM-105）晶体研究了其结晶方法，以及它们的晶体特性和灵敏度。发现H ₅₀LLM-105的数值（冲击灵敏度）在33.8–112.2 cm的极宽范围内变化，主要受颗粒形态，晶体完整性，颗粒表面缺陷和粗糙度的影响，但大多数与晶体内缺陷和颗粒大小无关。所有样品的摩擦敏感度均为零，不受晶体特性的影响。的G ^ ₅₀值（冲击敏感度）在0-6.9毫米范围内，随着粒度和表观晶体密度的减小而增加。值得注意的是，具有球形，良好的完整性，光滑的表面和较少的缺陷的LLM-105晶体对冲击和冲击脉冲不敏感。LLM-105的晶体特性与灵敏度之间的关系非常复杂，并显示出一些异常现象，这可归因于LLM-105的晶体堆积方式和聚集的微观结构。