Predicting the detonation properties of energetic materials through phonons

Area of Science:

• Materials Science
• Computational Chemistry
• Chemical Physics

Background:

• Understanding detonation mechanisms in energetic materials is vital for developing safer explosives.
• Microscopic insights are needed to complement macroscopic observations of detonation behavior.

Purpose of the Study:

• To introduce a novel microscopic parameter for predicting detonation velocity.
• To establish a correlation between phonon characteristics and detonation performance.

Main Methods:

• First-principles calculations using CASTEP code and density functional theory (DFT).
• Optimization of molecular geometries and analysis of phonon characteristics (j and Δw).
• Definition and calculation of the phonon energy transfer rate.

Main Results:

• A strong linear correlation (R² = 0.95) was found between the phonon energy transfer rate and detonation velocity.
• The model was validated with a diverse set of energetic materials, showing excellent agreement with experimental data.
• Phonon energy transfer rate emerged as a critical factor in detonation processes.

Conclusions:

• The phonon energy transfer rate provides a reliable microscopic predictor of detonation velocity.
• This study introduces a new computational approach for assessing energetic materials.
• The findings pave the way for the rational design of advanced energetic materials.