Hexagonal OsB2 reduction upon heating in H2 containing environment

Xie, Zhilin; Blair, Richard G.; Orlovskaya, Nina; Payzant, E. Andrew

doi:10.1179/1743676114Y.0000000212

Title: Hexagonal OsB₂ reduction upon heating in H₂ containing environment

Journal Article · Thu Oct 23 00:00:00 EDT 2014 · Advances in Applied Ceramics

DOI:https://doi.org/10.1179/1743676114Y.0000000212· OSTI ID:1265267

Xie, Zhilin ^[1]; Blair, Richard G. ^[1]; Orlovskaya, Nina ^[1]; Payzant, E. Andrew ^[2]

Univ. of Central Florida, Orlando, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

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 375⁰ C and complete transformation of OsB₂ to metallic Os was observed at 725⁰ 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265267

Journal Information:: Advances in Applied Ceramics, Vol. 114, Issue 2; ISSN 1743-6753

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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References (17)

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Title: Hexagonal OsB₂ reduction upon heating in H₂ containing environment