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Title: Backbone NxH compounds at high pressures

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4922051· OSTI ID:1335451
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [8];  [9];  [10];  [11];  [12]
  1. Chinese Academy of Sciences (CAS), Anhui (China); Carnegie Institution of Washington, Washington, D.C. (United States); Univ. of Science and Technology of China, Hefei (China)
  2. Carnegie Institution of Washington, Washington, D.C. (United States); Howard Univ., Washington, D.C. (United States)
  3. State Univ. of New York, Stony Brook, NY (United States); Guilin Univ. of Electronic Technology, Guilin (China)
  4. Guilin Univ. of Electronic Technology, Guilin (China)
  5. Skolkovo Institute of Science and Technology, Moscow (Russia); State Univ. of New York, Stony Brook, NY (United States); Guilin Univ. of Electronic Technology, Guilin (China); Moscow Institute of Physics and Technology, Moscow Region (Russian Federation)
  6. Carnegie Institution of Washington, Washington, D.C. (United States)
  7. Univ. College London, London (United Kingdom)
  8. Chinese Academy of Sciences (CAS), Anhui (China)
  9. Howard Univ., Washington, D.C. (United States)
  10. Carnegie Institution of Washington, Washington, D.C. (United States); V.S. Sobolev Institute of Geology and Mineralogy, Novosibirsk (Russia)
  11. Deutsches Elektronen-Synchrotron (DESY) Photon Science, Hamburg (Germany)
  12. Univ. of Chicago, Chicago, IL (United States)

Optical and synchrotron x-ray diffraction diamond anvil cell experiments have been combined with first principles theoretical structure predictions to investigate mixtures of N2 and H2 up to 55 GPa. Our experiments show the formation of structurally complex van der Waals compounds above 10 GPa. However, we found that these NxH (0.5<1.5) compounds transform abruptly to new oligomeric materials through barochemistry above 47 GPa and photochemistry at pressures as low as 10 GPa. These oligomeric compounds can be recovered to ambient pressure at T<130 K, whereas at room temperature, they can be metastable on pressure release down to 3.5 GPa. Extensive theoretical calculations show that such oligomeric materials become thermodynamically more stable in comparison to mixtures of N2, H2, and NH3 above approximately 40 GPa. Lastly, our results suggest new pathways for synthesis of environmentally benign high energy-density materials. These materials could also exist as alternative planetary ices.

Research Organization:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002006; AC02-98CH10086; FG02-94ER14466
OSTI ID:
1335451
Alternate ID(s):
OSTI ID: 1228626
Journal Information:
Journal of Chemical Physics, Vol. 142, Issue 21; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (14)

Materials discovery at high pressures journal February 2017
Fe-N system at high pressure reveals a compound featuring polymeric nitrogen chains journal July 2018
Alkaline-earth metal (Mg) polynitrides at high pressure as possible high-energy materials journal January 2017
Pressure-induced chemical reactions in the N 2 (H 2 ) 2 compound: from the N 2 and H 2 species to ammonia and back down into hydrazine journal January 2018
Structural phase transition and bonding properties of high-pressure polymeric CaN 3 journal January 2018
Kinetic boundaries and phase transformations of ice i at high pressure journal January 2018
Helium-hydrogen immiscibility at high pressures journal March 2019
Nontrivial metallic state of MoS 2 journal June 2018
Reactivity of Hydrogen-Helium and Hydrogen-Nitrogen Mixtures at High Pressures journal November 2018
Fe-N system at high pressure reveals a compound featuring polymeric nitrogen chains text January 2018
Reactivity of Hydrogen-Helium and Hydrogen-Nitrogen Mixtures at High Pressures text January 2018
Pentazole and Ammonium Pentazolate: Crystalline Hydro-Nitrogens at High Pressure journal February 2017
Crystal Structure and Stability of Ammonium Azide Under High Pressure journal December 2019
Transformation of Ammonium Azide at High Pressure and Temperature journal September 2020

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