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Title: Hexagonal OsB 2 reduction upon heating in H 2 containing environment

Abstract

The stability of hexagonal ReB 2 type OsB 2 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 OsB 2 to metallic Os was observed at 725⁰ C. The mechanisms of precipitation of metallic Os is proposed and changes in the lattice parameters of OsB 2 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) OsB 2; 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.

Authors:
 [1];  [1];  [1];  [2]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1265267
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Advances in Applied Ceramics
Additional Journal Information:
Journal Volume: 114; Journal Issue: 2; Journal ID: ISSN 1743-6753
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; osmium diboride; redox stability; hydrogen

Citation Formats

Xie, Zhilin, Blair, Richard G., Orlovskaya, Nina, and Payzant, E. Andrew. Hexagonal OsB2 reduction upon heating in H2 containing environment. United States: N. p., 2014. Web. doi:10.1179/1743676114Y.0000000212.
Xie, Zhilin, Blair, Richard G., Orlovskaya, Nina, & Payzant, E. Andrew. Hexagonal OsB2 reduction upon heating in H2 containing environment. United States. doi:10.1179/1743676114Y.0000000212.
Xie, Zhilin, Blair, Richard G., Orlovskaya, Nina, and Payzant, E. Andrew. Thu . "Hexagonal OsB2 reduction upon heating in H2 containing environment". United States. doi:10.1179/1743676114Y.0000000212. https://www.osti.gov/servlets/purl/1265267.
@article{osti_1265267,
title = {Hexagonal OsB2 reduction upon heating in H2 containing environment},
author = {Xie, Zhilin and Blair, Richard G. and Orlovskaya, Nina and Payzant, E. Andrew},
abstractNote = {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.},
doi = {10.1179/1743676114Y.0000000212},
journal = {Advances in Applied Ceramics},
number = 2,
volume = 114,
place = {United States},
year = {2014},
month = {10}
}

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Cited by: 4 works
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Works referenced in this record:

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives
journal, June 2013

  • Carenco, Sophie; Portehault, David; Boissière, Cédric
  • Chemical Reviews, Vol. 113, Issue 10, p. 7981-8065
  • DOI: 10.1021/cr400020d