Density Functional Theory Analyses for the Pressure‐Dependent Electronic, Optical, Phonon, Elastic, Mechanical, and Anisotropic Features of Be ₂ PN ₃

Density functional theory (DFT) calculations are used to investigate the pressure‐dependent electronic, optical, phonon, elastic, mechanical, and anisotropic properties of Be 2 PN 3 , a super‐incompressible nitride with outstanding mechanical resilience up to 400 GPa. The structural composition of Be 2 PN 3 , inspired by wurtzite‐type nitrides, contributes to its remarkable hardness and chemical stability, making it a potential candidate for extreme‐environment applications. The electronic bandgap decreases systematically under increasing pressure through computational analysis, transitioning the material from strong insulating behavior at ambient conditions to semiconducting and potentially metallic characteristics at high pressures. Optical absorption, reflectivity, loss function, and dielectric responses demonstrate pronounced pressure‐induced modifications, highlighting the material's adaptability in optoelectronic applications. The elastic properties, including bulk modulus, shear modulus, and Young's modulus, increase under pressure, reinforcing the material's stiffness. Moreover, the Pugh and Poisson ratios indicate a transition from brittle to ductile behavior with increasing compression, which is crucial for mechanical applications. Elastic anisotropy calculations reveal enhanced directional dependence under pressure, further influencing the mechanical and optical performance of Be 2 PN 3 . These findings provide a comprehensive understanding of the high‐pressure behavior of Be 2 PN 3 , paving the way for its potential utilization in advanced technological applications requiring superior mechanical and electronic properties.