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New insights on the role of KNO3 in dissociation reaction mechanism of ammonium nitrate
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DOI：10.1007/s10973-026-15968-5.png)
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Abstract
En 中文
Structural instability often causes accidents in ammonium nitrate (AN)-based materials. This study explores potassium nitrate (KNO3) as a dual-functional additive to stabilize the phase structure and enhance the thermal stability of AN. The modified crystals stabilized in phase III at room temperature, suppressing the IV → III phase transition. Thermal analysis indicated that K+ incorporation induced lattice strain, restricting NH 4 + rotation and thereby increasing the onset and peak temperatures of decomposition. Model-free kinetic analyses confirmed a notable rise in the overall decomposition activation energy for AN/2.5% KNO3 compared to pure AN, especially in the early reaction stage. DFT calculations suggested that KNO3 doping modifies the proton transfer pathway in AN, improving its ground-state stability. These results clarify the structure–stability relationships in AN/KNO3 systems and provide data support for enhancing the safety of AN-based materials.
Keywords:
Ammonium nitrate
Dissociation reaction
Kinetic analysis
Phase stabilization
Journal
IF:
3.1
Papers:
1.8W
Citations:
3.2W
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Cited Papers