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Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
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Exotic Hydrogen Bonding in Compressed Ammonia Hydrides
Xianqi Song1, Ketao Yin1, Yanchao Wang1
1State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, Department of Materials Science, and Innovation Center for Computational Physics Methods and Software , Jilin University , Changchun 130012 , China.
The Journal of Physical Chemistry Letters
|May 9, 2019
Summary
Researchers discovered exotic hydrogen bonding in compressed ammonia hydrides (NH7). Novel ionic phases and superionic states were identified, advancing knowledge of high-pressure hydrogen storage materials.
Area of Science:
- Materials Science
- High-Pressure Physics
- Solid-State Chemistry
Background:
- Hydrogen-rich compounds are crucial for energy storage and exhibit diverse hydrogen bonding.
- Ammonia hydrides are of significant interest due to their potential for novel hydrogen interactions.
Purpose of the Study:
- To investigate the structural and bonding properties of ammonia hydrides under high pressure.
- To identify novel phases and hydrogen bonding motifs in compressed ammonia hydrides.
Main Methods:
- High-pressure synthesis and characterization of ammonia hydrides.
- X-ray diffraction and computational modeling to determine crystal structures.
Main Results:
- Discovery of two novel ionic phases in ammonia hydrides (NH7) above 25 GPa and 60 GPa.
- Identification of exotic NH3-H+-NH3 units and superionic phases at elevated temperatures.
- Structural units include NH3-H+-NH3, H-, H2, NH4+.
Conclusions:
- The study reveals exotic hydrogen bonding and novel ionic/superionic phases in compressed ammonia hydrides.
- Findings enhance understanding of high-pressure ammonia-hydrogen systems with implications for planetary science and hydrogen storage.
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