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High-pressure formation of antimony nitrides: a first-principles study
1The First Hospital of Jilin University, Jilin University Changchun P. R. China.
RSC Advances
|May 2, 2022
Summary
Researchers explored antimony nitrides under pressure, discovering new stable phases like Sb2N3 and nitrogen-rich SbN2 and SbN4. SbN4 exhibits high energy density, suggesting potential applications.
Area of Science:
- Materials Science
- Solid State Physics
- Computational Chemistry
Background:
- Antimony nitrides are compounds with potential applications.
- Understanding their structural and electronic properties under pressure is crucial for materials design.
Purpose of the Study:
- To investigate the structural phase transitions and electronic properties of antimony nitrides.
- To explore the formation enthalpy and stability of Sb-N systems under varying pressures.
Main Methods:
- First-principles projector augmented wave (PAW) method.
- Density Functional Theory (DFT) calculations.
- Analysis of structural, electronic, and bonding properties.
Main Results:
- A novel stable phase of Sb2N3 was identified at high pressures (100-120 GPa).
- Two nitrogen-rich phases, SbN2 and SbN4, were predicted with distinct phase transitions under pressure.
- SbN2 and SbN4 exhibit sandwich structures with electron transfer during pressure-induced transitions.
- Nitrogen-rich SbN4 shows a high energy density of 2.42 kJ g⁻¹, indicating potential as an energetic material.
Conclusions:
- Antimony nitrides exhibit complex phase behavior under pressure.
- Nitrogen-rich phases like SbN4 are promising candidates for high energy density materials.
- Computational methods are effective for predicting novel material properties.
