Chin. Phys. Lett.  2021, Vol. 38 Issue (6): 066201    DOI: 10.1088/0256-307X/38/6/066201
New Members of High-Energy-Density Compounds: YN$_{5}$ and YN$_{8}$
Jun-Yi Miao1,2, Zhan-Sheng Lu1, Feng Peng2,1*, and Cheng Lu3*
1School of Physics, Henan Normal University, Xinxiang 453007, China
2College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471022, China
3School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China
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Jun-Yi Miao, Zhan-Sheng Lu, Feng Peng et al  2021 Chin. Phys. Lett. 38 066201
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Abstract Polymeric nitrogen is a promising candidate for a high-energy-density material. Synthesis of energetic compounds with high chemical stability under ambient conditions is still a challenging problem. Here we report a theoretical study on yttrium nitrides by first principles calculations combined with an effective crystal structure search method. It is found that many yttrium nitrides with high nitrogen content can be formed under relatively moderate pressures. The results indicate that the nitrogen-rich YN$_{5}$ and YN$_{8}$ compounds are recoverable as metastable high-energy materials under ambient conditions, and can release enormous energies (2.51 kJ$\cdot$g$^{-1}$ and 3.18 kJ$\cdot$g$^{-1}$) while decomposing to molecular nitrogen and YN. Our findings enrich the family of transition metal nitrides, and open avenues for design and synthesis of novel high-energy-density materials.
Received: 11 March 2021      Published: 25 May 2021
PACS:  numbers.62.50.-p  
  61.66.Fn (Inorganic compounds)  
  81.40.Vw (Pressure treatment)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11774140, U1804121, and 11304167), and China Postdoctoral Science Foundation (Grant No. 2016M590033).
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Jun-Yi Miao
Zhan-Sheng Lu
Feng Peng
and Cheng Lu
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