Study of the New Two-Dimensional Compound CoC

Exotic Two-Dimensional Structure: The First Case of Hexagonal NaCl

“…2 Modern advanced technologies allow scientists to synthesize new two-dimensional (2D) materials of various composition and often with an unexpected crystal structure that has no counterparts in the bulk. Known examples include silicene 3,4 (2D silicon); stanene 5 (monolayer of tin); borophene 6 (monolayer of boron atoms); and 2D layers of CuO, 7 Fe, 8 FeO, 9 CoC, 10 etc.…”

Insights into the regularity of the formation of 2D 3d transition metal monocarbides

“…Noteworthy, this o-FeC lattice is characterized by 5-and 7-coordinated carbon and iron atoms, respectively, that can be represented as a net of carbon dimers inside metal hexagons. The same orthorhombic phase was also predicted for CoC, 21 NiC and CuC. 22 Such extension of 2D phases of 3d transition metal monocarbides (TMC) is particularly noticeable since no comprehensive data is available for their bulk phases.…”

“…Planar orthorhombic (o-TMC: e.g. o-FeC, 18 o-CoC, 21 and o-CuC 22 ) and corrugated tetragonal lattices (t-TMC: e.g. t-FeC 18 ) are known by now from ab initio predictions.…”

“…Lack of experimental reports on bulk 3d TMC formation together with recent theoretical predictions of promising 2D TMC phases raises a suggestion that some metal monocarbides might form specific planar structures rather than 3D crystals. In particular, for the reported 2D orthorhombic phases of FeC, CoC, NiC, and CuC, 18,21,22 further comprehensive studies of their stability is necessary, including an analysis of binary compositional phase TM-C diagrams.…”

Two-Dimensional CuO Inside the Supportive Bilayer Graphene Matrix

“…Such a family may even consist of 2D films without layered bulk counterparts, which allows one to suggest the expandability of the family on new 2D materials with unusual atomic structures. For example, 2D metal oxide and carbide films can form monolayer structure like graphene and h-BN but also exhibit an ordered magnetic structure and specific rectangular lattice. − …”