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arXiv · 2112.01843

Elastic stability of Ga$_2$O$_3$: Addressing the $\beta$ to $\alpha$ phase transition from first principles

Konstantin Lion·Pasquale Pavone·Claudia Draxl
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Abstract

Elastic and structural properties of $\beta$-Ga$_2$O$_3$ and $\alpha$-Ga$_2$O$_3$ are investigated from first principles. The full elastic tensors and elastic moduli of both phases at $0$ K are computed in the framework of semi-local density-functional theory. We determine mechanical instabilities of $\beta$-Ga$_2$O$_3$ by evaluating the full stiffness tensor under load for a range of hydrostatic pressure values. While a phase transition from the $\beta$ to $\alpha$ phase is found to be energetically favored at $2.6$ GPa, we show that the $\beta$ phase is only mechanically unstable for much higher pressures ($>30$ GPa), which agrees well with experimental results. Our employed approach is based on the Born stability criterion, is independent of crystal symmetry, and thus can be readily applied to different materials.

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Konstantin Lion, Pasquale Pavone, Claudia Draxl. 2021-12-03. Elastic stability of Ga$_2$O$_3$: Addressing the $\beta$ to $\alpha$ phase transition from first principles. https://doi.org/10.1103/physrevmaterials.6.013601

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