Hexagonal OsB2 reduction upon heating in H-2 containing environment
Abbreviated Journal Title
Adv. Appl. Ceram.
Osmium diboride; Redox stability; Hydrogen; SUPERHARD RHENIUM DIBORIDE; OSMIUM DIBORIDE; MECHANICAL-PROPERTIES; COMPOSITES; PRESSURE; BEHAVIOR; POWDER; ZRB2; Materials Science, Ceramics
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 degrees C and complete transformation of OsB2 to metallic Os was observed at 725 degrees 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.
Advances in Applied Ceramics
"Hexagonal OsB2 reduction upon heating in H-2 containing environment" (2015). Faculty Bibliography 2010s. 6885.