Synthesis Of Osmium Borides By Mechanochemical Method

Keywords

High-energy ball-milling; osmium borides; phase structure; thermal stability

Abstract

Transition metal osmium borides were synthesized by mechanochemical method using high-energy ball-milling with Os (Osmium) and B (Boron) powders as raw materials. The formation process, reaction mechanism, and thermal stability of the mechochemically synthesized osmium borides were studied. Almost pure Os2B3 phase was obtained when the Os-to-B molar ratio was 1:2; while ReB2-type hexagonal OsB2 with a small amount of RuB2-type orthorhombic OsB2 was obtained when the Os-to-B molar ratio was 1:3. Stoichiometry OsB2 was obtained from boron rich starting mixture powders due to the B loss during the high-energy ball-milling process. It was also found that WC and osmium oxide were present as contaminants after ball milling for 40 hours. Heat treatment results revealed that the as-synthesized Os2B3 powders are thermally stable in flowing Ar up to 800°C, but a transformation from hexagonal to orthorhombic structure partially occurred for the OsB2 powders as low as 600°C.

Publication Date

6-1-2017

Publication Title

Journal of the American Ceramic Society

Volume

100

Issue

6

Number of Pages

2419-2428

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1111/jace.14785

Socpus ID

85017353848 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85017353848

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