Decomposition mechanism on different surfaces of copper azide

Area of Science:

• Materials Science
• Computational Chemistry
• Chemical Engineering

Background:

• Copper azide is a potential replacement for traditional primary explosives.
• The decomposition mechanism of copper azide is not well understood.
• Understanding decomposition pathways is crucial for safe handling and application of energetic materials.

Purpose of the Study:

• To elucidate the decomposition mechanism of copper azide using first-principles calculations.
• To identify the most stable surfaces of copper azide.
• To propose a new decomposition pathway based on simulated N-N bond breaking.

Main Methods:

• First-principles calculations were employed to study copper azide.
• Transition state calculations were used to identify reaction pathways.
• Electronic structure calculations were performed to analyze bond stabilization.

Main Results:

• The (010)_N3, (100)_N3, and (001) facets were identified as the most stable surfaces.
• A synergistic effect between Cu-N chains was observed during decomposition.
• A new decomposition mechanism involving simultaneous N2-N3 bond breaking and subsequent N-N bond rupture was proposed, releasing significant energy with a low activation barrier.

Conclusions:

• The decomposition of copper azide is surface-dependent.
• A novel decomposition pathway involving synergistic chain reactions and N-N bond breaking was identified.
• These findings provide critical insights into the energetic properties and decomposition of copper azide.