| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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The Unexpected Stability of Hydrazine Molecules in Hydrous Environment under Pressure |
| Shu-Qing Jiang1, Xue Yang2, Xiao-Li Huang3, Yan-Ping Huang3, Xin Li1, Tian Cui1,3** |
1Synergetic Extreme Condition User Facility, College of Physics, Jilin University, Changchun 130012
2School of Science, Changchun Institute of Technology, Changchun 130012
3State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012
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| Cite this article: |
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Shu-Qing Jiang, Xue Yang, Xiao-Li Huang et al 2020 Chin. Phys. Lett. 37 016102 |
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Abstract The incomplete decomposition product of metastable hydrazine (N$_{2}$H$_{4}$) instead of the energetically favorable ammonia (NH$_{3}$) upon decompression is one drawback in applications of energetic material oligomeric hydronitrogens. We explore the stability of hydrazine molecules in hydrazine hydrate (N$_{2}$H$_{4}$$\cdot$H$_{2}$O) under pressure in diamond anvil cells (DACs) combined with in situ Raman spectroscopy and synchrotron x-ray diffraction (XRD) measurements. The results show that one NH$_{2}$ branch forms NH$_{3}$ group by hydrogen bonds between hydrazine and water molecules after the sample crystallizes at 3.2 GPa. The strengthening hydrogen bonds cause the torsion of hydrazine molecules and further dominate a phase transition at 7.2 GPa. Surprisingly, the NN single bonds are strengthened with increasing pressure, which keeps the hydrazine molecules stable up to the ultimate pressure of 36 GPa. Furthermore, the main diffraction patterns show continuous shift to higher degrees in the whole pressure range while some weak lines disappear above 8.2 GPa. The present peak-indexing results of the diffraction patterns with Materials Studio show that the phase transition occurs in the same monoclinic crystal system. Upon decompression, all of the hydrazine molecules extract from hydrazine hydrate crystal at 2.3 GPa, which may provide a new way to purify hydrazine from hydrate.
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Received: 08 October 2019
Published: 23 December 2019
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| PACS: |
61.50.Ks
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(Crystallographic aspects of phase transformations; pressure effects)
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62.50.-p
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(High-pressure effects in solids and liquids)
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33.20.Fb
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(Raman and Rayleigh spectra (including optical scattering) ?)
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61.05.cp
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(X-ray diffraction)
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| Fund: Supported by the National Key R&D Program of China under Grant Nos. 2018YFA0305900 and 2016YFB0201204, the National Natural Science Foundation of China under Grant Nos. 11604342, 51572108, 51632002, 11504127, 11674122, 11574112, 11474127, and 11634004, the Program for Changjiang Scholars and Innovative Research Team in University under Grant No. IRT_15R23, and the National Fund for Fostering Talents of Basic Science under Grant No. J1103202. |
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