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Polymorphism, phase transformation and energetic properties of 3-nitro-1,2,4-triazole.

ABSTRACT: We report the preparation, analysis, and phase transformation behavior of polymorphs of 3-nitro-1,2,4-triazole. The compound crystallizes in two different polymorphic forms, Form I (tetragonal, P4₁2₁2) and Form II (monoclinic, P2₁/c). Analysis of the polymorphs has been investigated using microscopy, differential scanning calorimetry, in situ variable-temperature powder X-ray diffraction, and single-crystal X-ray diffraction. On heating, Form II converts into Form I irreversibly, and on further heating, decomposition is observed. In situ powder X-ray diffraction studies revealed that Form II transforms to Form I above 98 °C, indicating that Form I is more stable than Form II at high temperature. Form II of 3-nitro-1,2,4-triazole has good detonation properties (V _det = 8213 m s^-1, P _C-J = 27.45 GPa), and low sensitivity (IS > 40 J, FS = 360 N, ESD = 29 J), which make it a competitive candidate for use as a new insensitive explosive.

SUBMITTER: Zhang P

PROVIDER: S-EPMC9082135 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Polymorphism, phase transformation and energetic properties of 3-nitro-1,2,4-triazole.

Zhang Pengcheng P Zhao Xiuxiu X Du Yao Y Gozin Michael M Li Shenghua S Pang Siping S

RSC advances 20180710 43

We report the preparation, analysis, and phase transformation behavior of polymorphs of 3-nitro-1,2,4-triazole. The compound crystallizes in two different polymorphic forms, Form I (tetragonal, P41212) and Form II (monoclinic, P21/c). Analysis of the polymorphs has been investigated using microscopy, differential scanning calorimetry, in situ variable-temperature powder X-ray diffraction, and single-crystal X-ray diffraction. On heatin ...[more]

PMID: 35539157

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