Structural transition of LiBeH3 under high pressure

Year 2022, Volume: 6 Issue: 2, 129 - 134, 31.12.2022

Çağatay Yamçıçıer , Selgin Al

https://doi.org/10.32571/ijct.1190931

Abstract

LiBeH3 has been considered as a solid-state hydrogen storage material. This study investigated Pnma orthorhombic phase of LiBeH3 under pressure. Ab initio constant pressure molecular dynamic simulation under pressure was adopted. The results depicted a phase transition from Pnma orthorhombic phase to P21/m monoclinic phase at 270 GPa simulation pressure. The stability of each phase was examined using elastic constants. Based on the well-known Born stability criteria, both phases showed mechanical stability. Several moduli have been computed via elastic constants. The B/G ratios, Cauchy pressures and Poisson’s ratios investigation revealed that LiBeH3 is brittle at Pnma phase whereas it is ductile at P21/m phase. The electronic band structures and partial and total density of states of phases were also obtained. A 2.058 eV band gap was seen for Pnma phase, and 3 eV band gap was seen for P21/m phase.

Keywords

phase transition, ab initio, elastic properties, stability.

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