Title

Superoctahedral Two-Dimensional Metallic Boron with Peculiar Magnetic Properties

Document Type

Article

Journal/Book Title

Physical Chemistry Chemical Physics

Publication Date

8-18-2019

Publisher

Royal Society of Chemistry

Award Number

NSF, Division of Chemistry (CHE) 1664379

Funder

NSF, Division of Chemistry (CHE)

Volume

21

Issue

36

First Page

19764

Last Page

19771

Abstract

Among the diversity of new materials, two-dimensional crystal structures have been attracting significant attention from the broad scientific community due to their promising applications in nanoscience. In this study we predict a novel two-dimensional ferromagnetic boron material, which has been exhaustively studied with DFT methods. The relaxed structure of the 2D-B6 monolayer consists of slightly flattened octahedral units connected with 2c-2e B–B σ-bonds. The calculated phonon spectrum and ab initio molecular dynamics simulations reveal the thermal and dynamical stability of the designed material. The calculation of the mechanical properties indicate a relatively high Young's modulus of 149 N m−1. Moreover, the electronic structure indicates the metallic nature of the 2D-B6 sheets, whereas the magnetic moment per unit cell is found to be 1.59 μB. The magnetism in the 2D-B6 monolayer can be described by the presence of two unpaired delocalized bonding elements inside every distorted octahedron. Interestingly, the nature of the magnetism does not lie in the presence of half-occupied atomic orbitals, as was shown for previously studied magnetic materials based on boron. We hope that our predictions will provide promising new ideas for the further fabrication of boron-based two-dimensional magnetic materials.

Share

COinS