First principle calculations of alkali hydride electronic structures

Area of Science:

• Solid State Physics
• Computational Materials Science
• Quantum Chemistry

Background:

• Alkali hydrides (LiH, NaH, KH, RbH, CsH) exhibit diverse properties.
• Understanding their electronic structure is crucial for material applications.

Purpose of the Study:

• To investigate the electronic structure, volume optimization, bulk moduli, elastic constants, and vibrational frequencies of alkali hydrides.
• To explain observed differences in electronic distributions and interactions.
• To refine theoretical approaches for alkali hydride properties.

Main Methods:

• Full potential augmented plane wave (FP-APW) method with local orbitals.
• Full potential linearized augmented plane wave (FP-LLAPW) method.

Main Results:

• Calculated electronic structure, volume optimization, bulk moduli, elastic constants, and phonon frequencies.
• Identified commonalities and significant differences in electronic structures.
• Highlighted prominent variations in electronic distributions across crystallographic planes.

Conclusions:

• Electronic structures of alkali hydrides show complex behavior not explained by simple empirical trends.
• Detailed electronic distribution analysis is key to understanding property variations.
• Findings provide a basis for re-evaluating experimental data and theoretical models.