| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Pressure-induced structural transition and low-temperature recovery of sodium pentazolate |
| Zitong Zhao(赵梓彤), Ran Liu(刘然), Linlin Guo(郭琳琳), Shuang Liu(刘爽), Minghong Sui(隋明宏), Bo Liu(刘波), Zhen Yao(姚震)†, Peng Wang(王鹏)‡, and Bingbing Liu(刘冰冰) |
| State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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Abstract Pentazolate compounds have attracted extensive attention as high energy density materials. The synthesis and recovery of pentazolate compounds is of great importance for their potential applications. Here, we report the synthesis of $Pmn$2$_{1}$-NaN$_{5}$ and $Pm$-Na$_{2}$N$_{5}$ through compressing and laser heating pure NaN$_{3}$ at $\sim 60 $ GPa. Upon decompression, the pressure-induced structural transition from $Pmn$2$_{1}$-NaN$_{5}$ into $Cm$-NaN$_{5}$ is observed in the pressure range of 14-23 GPa for the first time. The cyclo-N$_{5}^{-}$ can be traced down to 4.7 GPa at room temperature and recovered to ambient pressure under low temperature condition (up to 160 K). The $Pm$-Na$_{2}$N$_{5}$ is suggested to decompose into the $P$4/$mmm$-NaN$_{2}$ at 23 GPa, and be stable at ambient conditions. This work provides insight into the high-pressure behaviors of pentazolate compounds and an alternative way to stabilize energetic polynitrogen compounds.
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Received: 15 November 2022
Revised: 02 February 2023
Accepted manuscript online: 06 February 2023
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PACS:
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62.50.-p
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(High-pressure effects in solids and liquids)
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64.60.-i
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(General studies of phase transitions)
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61.66.Fn
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(Inorganic compounds)
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| Fund: Project supported by the National Key R&D Program of China (Grant No. 2018YFA0305900), the National Natural Science Foundation of China (Grant Nos. 12174143, 11634004, 11847094, and 11804384), and JLU Science and Technology Innovative Research Team (Grant No. 2017TD-01). |
Corresponding Authors:
Zhen Yao, Peng Wang
E-mail: yaozhen@jlu.edu.cn;wangpengtrrs@jlu.edu.cn
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Cite this article:
Zitong Zhao(赵梓彤), Ran Liu(刘然), Linlin Guo(郭琳琳), Shuang Liu(刘爽), Minghong Sui(隋明宏), Bo Liu(刘波), Zhen Yao(姚震), Peng Wang(王鹏), and Bingbing Liu(刘冰冰) Pressure-induced structural transition and low-temperature recovery of sodium pentazolate 2023 Chin. Phys. B 32 046202
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