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Issue 3, 2001
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Atmospheric ageing of nanosized silicon nitridepowders

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Abstract

Ambient oxidation of nanosized silicon nitride powder produced by the vapour phase reaction of silicon tetrachloride and ammonia has been studied in this work. Aliquots of the powder were stored in argon gas, in dry air and in air of 80% humidity, and changes in the bulk and surface properties were investigated against the ageing time. The powder samples were characterised by wet chemical analysis, XPS, TG-MS, FTIR, XRD and TEM methods. No significant changes were detected on storage in argon gas for 90 days. However, in samples stored in dry air and humid air, remarkable oxidation and formation of N–H species were found. The particulate powder tends to agglomerate in both dry and humid air, and this results in changes in the particle size and morphology. The nanosized silicon nitride powders therefore should be processed by excluding their contact with the oxygen and moisture containing ambient atmosphere.

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Publication details

The article was received on 19 Oct 2000, accepted on 12 Dec 2000 and first published on 30 Jan 2001


Article type: Paper
DOI: 10.1039/B008429H
Citation: J. Mater. Chem., 2001,11, 859-863
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    Atmospheric ageing of nanosized silicon nitride powders

    J. Szépvölgyi, I. Mohai and J. Gubicza, J. Mater. Chem., 2001, 11, 859
    DOI: 10.1039/B008429H

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