Two-dimensional diboron trioxide crystal composed by boroxol groups

Authors: T. Zio^1,2†, M Dirindin²†, C. Di Giorgio¹, M. Thaler³, B. Achatz³, C. Cepek¹, I Cojocariu^2,4, M. Jugovac⁴, T. O. Menteş⁴, A. Locatelli⁴, L. L. Patera³, A. Sala¹*, G. Comelli^1,2, M. Peressi²*, C. Africh¹

Affiliations:                                                                                                                

¹CNR – Istituto Officina dei Materiali (IOM); Basovizza, Trieste, 34149 Italy.

²Department of Physics, University of Trieste; Trieste, 34127 Italy.

³Department of Physical Chemistry, University of Innsbruck; Innsbruck, 6020 Austria.

⁴Elettra Sincrotrone Trieste S.C.p.A; Basovizza, Trieste, 34149 Italy.

*Corresponding author. Email: sala@iom.cnr.it (experiment), peressi@units.it (theory).

†These authors contributed equally to this work.

Abstract
Diboron trioxide (B2O3) represents an unusual case among polymorphic oxides, for its vitrified state features superstructural units – planar boroxol groups – that are never observed in its three-dimensional crystalline polymorphs. Crystalline polymorphs that incorporate boroxol groups have only been predicted theoretically, although their formation is crucial to rationalize the ability of B2O3 to vitrify. Here we present the synthesis of a two-dimensional crystalline B2O3 polymorph constituted by boroxol groups arranged in an atomically thin honeycomb lattice. By combining surface science experimental techniques with ab initio calculations, we characterize the structural and electronic properties of this B2O3 polymorph down to the atomic level. This discovery enlarges the family of two-dimensional materials and enables the atomic tracking of individual structural units in trioxides.

Dateset: https://doi.org/10.24435/materialscloud:e1-bf