Oxygen interaction with hexagonal OsB2 at high temperature

Xie, Zhilin; Blair, Richard G.; Orlovskaya, Nina; Cullen, David A.; Kata, Dariusz; Rutkowski, Pawel; Lis, Jerzy; Qin, Nan; T-Raissi, Ali

doi:10.1111/jace.14434

Title: Oxygen interaction with hexagonal OsB₂ at high temperature

Journal Article · Wed Aug 10 00:00:00 EDT 2016 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.14434· OSTI ID:1345002

Xie, Zhilin ^[1]; Blair, Richard G. ^[1]; Orlovskaya, Nina ^[1]; Cullen, David A. ^[2]; Kata, Dariusz ^[3]; Rutkowski, Pawel ^[3]; Lis, Jerzy ^[3]; Qin, Nan ^[4]; T-Raissi, Ali ^[4]

Univ. of Central Florida, Orlando, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
AGH Univ. of Science and Technology in Krakow, Krakow (Poland)
Univ. of Central Florida, Cocoa, FL (United States)

The stability of ReB₂-type hexagonal OsB₂ 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 OsB₂ 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 OsB₂ lattice as well as changes in the stoichiometry of the compound. It was also found that under low oxygen partial pressure, sintering of OsB₂ powders occurred at a relatively low temperature (900°C). Finally, hexagonal OsB₂ ceramic is prone to oxidation and it is very sensitive to oxygen partial pressures, especially at high temperatures.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1345002

Journal Information:: Journal of the American Ceramic Society, Vol. 99, Issue 12; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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