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Synthesis of osmium borides by mechanochemical method
Author(s) -
Long Ying,
Zhang Jinyang,
Zou Canhui,
Lin HuaTay,
An Linan,
Zhang Fenglin,
Wang Chengyong
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14785
Subject(s) - osmium , orthorhombic crystal system , materials science , ball mill , stoichiometry , boron , molar ratio , hexagonal crystal system , metallurgy , metal , mineralogy , chemical engineering , crystallography , crystal structure , chemistry , catalysis , biochemistry , organic chemistry , ruthenium , engineering
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 Os 2 B 3 phase was obtained when the Os‐to‐B molar ratio was 1:2; while ReB 2 ‐type hexagonal OsB 2 with a small amount of RuB 2 ‐type orthorhombic OsB 2 was obtained when the Os‐to‐B molar ratio was 1:3. Stoichiometry OsB 2 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 Os 2 B 3 powders are thermally stable in flowing Ar up to 800°C, but a transformation from hexagonal to orthorhombic structure partially occurred for the OsB 2 powders as low as 600°C.