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Experimental and Ab-initio Investigations of Osmium Diboride

Published online by Cambridge University Press:  01 February 2011

M. M. Hebbache ,
L. Stuparevic ,
D. Zivkovic  and
M. Zemzemi
M. M. Hebbache
Affiliation:
[email protected], Universite Paris 7, Materiaux et Phenomenes Quantiques (UMR 7162), 2 Place Jussieu, Paris Cedex 05, N/A, F-75251, France
L. Stuparevic
Affiliation:
[email protected], University of Belgrade, Department of Metallurgy, VJ12, Bor, 19210, Yugoslavia
D. Zivkovic
Affiliation:
[email protected], University of Belgrade, Department of Metallurgy, VJ12, Bor, 19210, Yugoslavia
M. Zemzemi
Affiliation:
[email protected], Universite Paris 7, Materiaux et Phenomenes Quantiques (UMR 7162), 2 Place Jussieu, Paris Cedex 05, F-75221, France
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Abstract

More than half a century after their discovery, almost nothing is known about the physical properties of osmium borides, thought their structures have been clearly identified in the early sixties. We re-examined the phase diagram of the binary system osmium-boron and confirm the existence of two hexagonal phases, OsB1.1, Os2B3 and an orthorhombic phase, OsB2. Our microhardness measurements show that the synthesized OsB2 is extremely hard. In addition, first-principles calculations have been conducted to investigate its physical properties. It is shown that OsB2 is also a low compressibility material. Most of the transition metal borides have already found applications as in protective armor, nuclear reactors, reinforcement, etc. OsB2 can be used in applications like hard coating.

Keywords

hardnesspowder metallurgysimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 929: Symposium II – Materials in Extreme Environments , 2006 , 0929-II01-10
Copyright
Copyright © Materials Research Society 2006

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