Hexagonal Osb2 Reduction Upon Heating In H2 Containing Environment

Keywords

Hydrogen; Osmium diboride; Redox stability

Abstract

The stability of hexagonal ReB2 type OsB2 powder upon heating under reforming gas was investigated. Pure Os metal particles were detected by powder X-ray diffraction starting at 375°C and complete transformation of OsB2 to metallic Os was observed at 725°C. The mechanisms of precipitation of metallic Os is proposed and changes in the lattice parameters of OsB2 upon heating are analysed in terms of the presence of oxygen or water vapour in the heating chamber. Previous studies suggested that Os atoms possess (0) valence, while B atoms possess both (+3) and (-3) valences in the alternating boron/osmium sheet structure of hexagonal (P63/mmc, No. 194) OsB2; if controllable method for Os removal from the lattice could be found, the opportunity would arise to form two-dimensional (2D) layers consisting of pure B atoms.

Publication Date

2-1-2015

Publication Title

Advances in Applied Ceramics

Volume

114

Issue

2

Number of Pages

114-120

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1179/1743676114Y.0000000212

Socpus ID

84920193133 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84920193133

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