Hexagonal OsB2 reduction upon heating in H2 containing environment

Z. L. Xie; R. G. Blair; N. Orlovskaya; E. A. Payzant

doi:10.1179/1743676114Y.0000000212

Hexagonal OsB₂ reduction upon heating in H₂ containing environment

Z. L. Xie, R. G. Blair, N. Orlovskaya, E. A. Payzant

Materials Engineering

University of Central Florida

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

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.

Original language	English
Pages (from-to)	114-120
Number of pages	7
Journal	Advances in Applied Ceramics
Volume	114
Issue number	2
DOIs	https://doi.org/10.1179/1743676114Y.0000000212
State	Published - Feb 1 2015

Bibliographical note

Publisher Copyright:
© 2015 Institute of Materials, Minerals and Mining

Keywords

Hydrogen
Osmium diboride
Redox stability

Access to Document

10.1179/1743676114Y.0000000212

Cite this

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title = "Hexagonal OsB2 reduction upon heating in H2 containing environment",

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.",

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T1 - Hexagonal OsB2 reduction upon heating in H2 containing environment

AU - Xie, Z. L.

AU - Blair, R. G.

AU - Orlovskaya, N.

AU - Payzant, E. A.

PY - 2015/2/1

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N2 - 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.

AB - 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.

KW - Hydrogen

KW - Osmium diboride

KW - Redox stability

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