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Stable Calcium Nitrides at Ambient and High Pressures

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [4];  [1];  [5]
  1. Sichuan Univ., Chengdu (China). Inst. of Atomic & Molecular Physics
  2. Luoyang Normal Univ., Luoyang(China); Beijing Computational Science Research Center, Beijing (China)
  3. Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
  4. Univ. of Saskatchewan, Saskatoon, SK (Canada)
  5. Univ. of Saskatchewan, Saskatoon, SK (Canada); Canadian Light Sources, Inc., Saskatoon, SK (Canada)
The knowledge of stoichiometries of alkaline-earth metal nitrides, where nitrogen can exist in polynitrogen forms, is of significant interest for understanding nitrogen bonding and its applications in energy storage. For calcium nitrides, there were three known crystalline forms, CaN2, Ca2N, and Ca3N2, at ambient conditions. In the present study, we demonstrated that there are more stable forms of calcium nitrides than what is already known to exist at ambient and high pressures. Using a global structure searching method, we theoretically explored the phase diagram of CaNx and discovered a series of new compounds in this family. In particular, we found a new CaN phase that is thermodynamically stable at ambient conditions, which may be synthesized using CaN2 and Ca2N. Four other stoichiometries, namely, Ca2N3, CaN3, CaN4, and CaN5, were shown to be stable under high pressure. The predicted CaNx compounds contain a rich variety of polynitrogen forms ranging from small molecules (N2, N4, N5, and N6) to extended chains (N). Because of the large energy difference between the single and triple nitrogen bonds, dissociation of the CaNx crystals with polynitrogens is expected to be highly exothermic, making them as potential high-energy-density materials.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001057
OSTI ID:
1388071
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 15 Vol. 55; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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High‐Pressure Synthesis of Metal–Inorganic Frameworks Hf 4 N 20 ⋅N 2 , WN 8 ⋅N 2 , and Os 5 N 28 ⋅3 N 2 with Polymeric Nitrogen Linkers journal May 2020
High-Pressure Synthesis of a Nitrogen-Rich Inclusion Compound ReN 8x  N 2 with Conjugated Polymeric Nitrogen Chains journal June 2018
High‐Pressure Synthesis of Metal–Inorganic Frameworks Hf 4 N 20 ⋅N 2 , WN 8 ⋅N 2 , and Os 5 N 28 ⋅3 N 2 with Polymeric Nitrogen Linkers journal May 2020
Alkaline-earth metal (Mg) polynitrides at high pressure as possible high-energy materials journal January 2017
Structural phase transition and bonding properties of high-pressure polymeric CaN 3 journal January 2018
Metallic and anti-metallic properties of strongly covalently bonded energetic AlN 5 nitrides journal January 2019
High-pressure formation of antimony nitrides: a first-principles study journal January 2020
Stable zigzag and tripodal all-nitrogen anion N 4 4− in BeN 2 journal May 2019
The reductive coupling of dinitrogen journal March 2019
High-pressure synthesis of a nitrogen-rich inclusion compound $ReN_{8}·xN_{2}$ with conjugated polymeric nitrogen chains text January 2018
Fe-N system at high pressure reveals a compound featuring polymeric nitrogen chains text January 2018
High‐Pressure Synthesis of Metal–Inorganic Frameworks $Hf{4}N_{2}0 ⋅ N_{2}$ , $WN_{8} ⋅ N_{2}$ , and $Os_{5}N_{28}$ ⋅ 3 $N_{2}$ with Polymeric Nitrogen Linkers text January 2020