Self‐propagating mechanosynthesis of HfB2 nanoparticles by a magnesiothermic reaction

A mechanically induced self‐sustaining reaction (MSR) was used to synthesize hafnium diboride nanoparticles. Along this route, magnesium was selected as a robust reducing agent for co‐reduction in boron and hafnium oxides in a combustive manner. Combustion occurred after a short milling period of 12...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-04, Vol.101 (4), p.1412-1419
Main Authors: Jalaly, Maisam, Gotor, Francisco J., Sayagués, María J.
Format: Article
Language:English
Subjects:
Boron oxides
Chemical synthesis
combustion
Hafnium compounds
Hafnium diboride (HfB2)
Hafnium oxide
Mechanosynthesis
Nanoparticles
Reduction
Self propagation
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Summary:A mechanically induced self‐sustaining reaction (MSR) was used to synthesize hafnium diboride nanoparticles. Along this route, magnesium was selected as a robust reducing agent for co‐reduction in boron and hafnium oxides in a combustive manner. Combustion occurred after a short milling period of 12 minutes. The hafnium diboride nanoparticles had a polygonal faceted morphology and were 50‐250 nm in diameter. The assessment of the processing mechanism revealed that the initial combustive reduction in B2O3 to elemental B by Mg was the major step for progressing the overall reaction. After that, HfO2 can be reduced to elemental Hf, followed by the synthesis of HfB2 phase.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15297