Atmospheric ageing of nanosized silicon nitride powders

Citation
J. Szepvolgyi et al., Atmospheric ageing of nanosized silicon nitride powders, J MAT CHEM, 11(3), 2001, pp. 859-863
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS CHEMISTRY
ISSN journal
09599428 → ACNP
Volume
11
Issue
3
Year of publication
2001
Pages
859 - 863
Database
ISI
SICI code
0959-9428(2001)11:3<859:AAONSN>2.0.ZU;2-K
Abstract
Ambient oxidation of nanosized silicon nitride powder produced by the vapou r phase reaction of silicon tetrachloride and ammonia has been studied in t his work. Aliquots of the powder were stored in argon gas, in dry air and i n 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 signif icant changes were detected on storage in argon gas for 90 days. However, i n samples stored in dry air and humid air, remarkable oxidation and formati on of N-H species were found. The particulate powder tends to agglomerate i n both dry and humid air, and this results in changes in the particle size and morphology. The nanosized silicon nitride powders therefore should be p rocessed by excluding their contact with the oxygen and moisture containing ambient atmosphere.