Abstract
5-Amino-1H-tetrazole (ATZ) is a promising fuel material for pyrotechnic compositions with high nitrogen content and energy. However, it forms hydrates when exposed to moisture, which negatively affects the burning performance. In this study, cocrystallization was applied to prevent the hydration of ATZ. As cocrystal-formers, 5-methyl-1H-tetrazole (MTZ), 3,5-diamino-1,2,4-triazole (DATA), and 4-amino-1,2,4-triazole (4ATA) were cocrystallized with ATZ. Cocrystal formation was confirmed using powder X-ray diffraction. The crystal structures of the ATZ/MTZ and ATZ/DATA cocrystals were determined using single-crystal X-ray diffraction. Thermal analyses showed that the onset temperatures of the three cocrystals were higher than that of ATZ. Humidity tests revealed that the ATZ/MTZ and ATZ/DATA cocrystals did not form hydrates and showed low hygroscopicity.
