High nitrogen polymer in silver polynitrides

Area of Science:

• Materials Science
• Computational Chemistry
• High-Pressure Physics

Background:

• The exploration of novel energetic materials is crucial for advancements in various technological fields.
• High-pressure synthesis offers a unique pathway to stabilize unusual stoichiometries and structures.
• Silver-nitrogen (Ag-N) compounds are of interest due to their potential for high energy density.

Purpose of the Study:

• To computationally investigate novel polymeric silver-nitrogen structures under high pressure.
• To evaluate the energetic properties and potential explosive performance of predicted Ag-N compounds.
• To understand the structure-property relationships in Ag-N systems at high pressures.

Main Methods:

• First-principles calculations were employed to predict and analyze Ag-N structures.
• High-pressure conditions were simulated to explore structural stability and evolution.
• Analysis of atomic orbital hybridization was used to understand bonding and structural mechanisms.

Main Results:

• Four novel polymeric Ag-N structures (P-1-AgN2, P21/c-AgN2, P-1-AgN5, C2/m-AgN6) were proposed.
• P-1-AgN2 and P21/c-AgN2 exhibit record energy densities for MN2 compounds.
• P-1-AgN5 and C2/m-AgN6 show energy densities comparable to or exceeding TNT, with excellent explosive performance.

Conclusions:

• Highly polymerized structures in Ag-N compounds can be formed at high pressures, even with low nitrogen content.
• The studied Ag-N compounds possess significant potential as advanced energetic materials.
• Computational methods are effective in discovering novel high-energy-density materials.