High-throughput computational search for two-dimensional binary compounds: Energetic stability versus synthesizability of three-dimensional counterparts

Abstract

Using first principles calculations, the energetic stability of two-dimensional (2D) binary compounds $XY$ is investigated, where $X$ and $Y$ indicate the metallic element from Li to Pb in the periodic table. Here, 1081 compounds in the buckled honeycomb (BHC), buckled square, B2, L1${}_0$, and B${}_h$ structures are studied. For the compounds that have negative formation energy in the BHC structure or the compounds that can have the B${}_h$ structure, the phonon dispersions of the 2D structures are also calculated. We demonstrate that (i) a negative formation energy is neither a sufficient nor necessary condition for yielding the dynamical stability of 2D compounds; and (ii) if a compound in the B${}_h$ structure has been synthesized experimentally, that in the BHC structure is dynamically stable.

6 pages, 4 figures

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Cited by in corpus (3)

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• Two-dimensional ionic crystals: The cases of IA-VII alkali halides and IA-IB CsAu
• A Framework for Identifying Non-van der Waals 2D Materials