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Oxygen Interaction with Hexagonal OsB 2 at High Temperature
Author(s) -
Xie Zhilin,
Blair Richard G.,
Orlovskaya Nina,
Cullen David A.,
Kata Dariusz,
Rutkowski Paweł,
Lis Jerzy,
Qin Nan,
TRaissi Ali
Publication year - 2016
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.14434
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , sintering , materials science , ceramic , oxygen , partial pressure , stoichiometry , mineralogy , composite material , chemistry , physics , organic chemistry , thermodynamics
The stability of ReB 2 ‐type hexagonal OsB 2 powder at high temperature with oxygen presence has been studied by thermogravimetric analysis, differential scanning calorimetry, SEM , EDS , and high‐temperature scanning transmission electron microscopy and XRD . Results of the study revealed that OsB 2 ceramics interact readily with oxygen present in reducing atmosphere, especially at high temperature and produces boric acid, which decomposes on the surface of the powder resulting in the formation of boron vacancies in the hexagonal OsB 2 lattice as well as changes in the stoichiometry of the compound. It was also found that under low oxygen partial pressure, sintering of OsB 2 powders occurred at a relatively low temperature (900°C). Hexagonal OsB 2 ceramic is prone to oxidation and it is very sensitive to oxygen partial pressures, especially at high temperatures.