Stabilized N<sub>5</sub> and N<sub>6</sub> rings in the Ag–N system under modest pressure

Zhang Huimin; Liu Ran; Yuan Jiajing; Wang Dongxue; Liu Ran; Wang Yuanyuan; Liu Zhaodong; Yao Zhen; Zhang Ying; Liu Shuang; Wang Peng

doi:10.1063/5.0282196

Volume 10 Issue 6

Nov. 2025

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Zhang Huimin, Liu Ran, Yuan Jiajing, Wang Dongxue, Liu Ran, Wang Yuanyuan, Liu Zhaodong, Yao Zhen, Zhang Ying, Liu Shuang, Wang Peng. Stabilized N5 and N6 rings in the Ag–N system under modest pressure[J]. Matter and Radiation at Extremes, 2025, 10(6): 067801. doi: 10.1063/5.0282196

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Zhang Huimin, Liu Ran, Yuan Jiajing, Wang Dongxue, Liu Ran, Wang Yuanyuan, Liu Zhaodong, Yao Zhen, Zhang Ying, Liu Shuang, Wang Peng. Stabilized N₅ and N₆ rings in the Ag–N system under modest pressure[J]. Matter and Radiation at Extremes, 2025, 10(6): 067801. doi: 10.1063/5.0282196

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Stabilized N₅ and N₆ rings in the Ag–N system under modest pressure

doi: 10.1063/5.0282196

State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University, Changchun 130012, China

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Corresponding author: a)Authors to whom correspondence should be addressed: zhangyingtt@jlu.edu.cn; liu_shuang@jlu.edu.cn; and wangpengtrrs@jlu.edu.cn
Received Date: 2025-05-23
Accepted Date: 2025-08-19

Available Online: 2025-11-28

Publish Date: 2025-11-01

Abstract

Abstract

High pressure enables the creation of novel functional materials by modifying chemical bonding and crystal structure, opening avenues for the development of high-energy-density polynitrogen materials. We present the high-pressure synthesis of three polynitrides P1 AgN₇, P2₁/c AgN₅, and P-1 AgN₄, achieved through direct reactions between silver and nitrogen. Notably, the synthesis pressures required for the formation of N₅ and N₆ rings from metal–nitrogen reactions in this work represent the lowest values reported to date in high-pressure studies. At 15 GPa, isolated N₅ rings are stabilized in P1 AgN₇ and P2₁/c AgN₅. At 26.3 GPa, P-1 AgN₄ is synthesized, featuring infinite one-dimensional nitrogen chains composed of alternating N₂ and N₆ rings, a unique catenation not observed in other polynitrides. In addition, AgN₇, AgN₅, and AgN₄ possess significantly higher volumetric energy densities E_v than the conventional explosive TNT, making them promising high-energy-density materials.

Conflict of Interest
The authors have no conflicts to disclose.
Huimin Zhang: Data curation (equal); Formal analysis (equal); Funding acquisition (equal); Investigation (equal); Supervision (equal); Writing – original draft (equal); Writing – review & editing (equal). Ran Liu: Data curation (equal); Formal analysis (equal); Investigation (equal); Writing – original draft (equal). Jiajing Yuan: Data curation (equal); Formal analysis (equal); Software (equal). Dongxue Wang: Data curation (equal); Software (equal). Ran Liu: Data curation (equal); Software (equal). Yuanyuan Wang: Software (equal). Zhaodong Liu: Data curation (equal); Software (equal). Zhen Yao: Data curation (equal). Ying Zhang: Data curation (equal); Funding acquisition (equal); Investigation (equal); Supervision (equal); Writing – review & editing (equal). Shuang Liu: Data curation (equal); Software (equal). Peng Wang: Data curation (equal); Software (equal); Supervision (equal).
Author Contributions
The data that support the findings of this study can be found in the article and its supplementary material.

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