Nitridation and densification of SiO2 aerogels

SiO2 aerogels were nitrided by NH3 treatment at 700-1300 C. The amount of N incorporated in SiO2 aerogel depends on the final temperature of ammonolysis and on the time of heat treatment. The maximum amount of N introduced into the aerogel structure reached 33.1 wt%. The specific surface area of nit...

Full description

Saved in:
Bibliographic Details
Published in:Journal of non-crystalline solids 2001-06, Vol.286 (1-2), p.58-63
Main Authors: SZANIAWSKA, K, MURAWSKI, L, PASTUSZAK, R, WALEWSKI, M, FANTOZZI, G
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:SiO2 aerogels were nitrided by NH3 treatment at 700-1300 C. The amount of N incorporated in SiO2 aerogel depends on the final temperature of ammonolysis and on the time of heat treatment. The maximum amount of N introduced into the aerogel structure reached 33.1 wt%. The specific surface area of nitrided aerogels remains high and decreases with the temperature of ammonolysis and with N content. FTIR spectra of nitrided aerogels indicated that NH3 reacts with SiO2 aerogels to form compounds in which atoms of N are coordinated by three atoms of Si. Nitrided aerogels can be converted into dense homogeneous oxynitride glasses containing 8.4-13.0 wt% of N by heat treatment at 1600 C in vacuum or in N atmosphere. 14 refs.
ISSN:0022-3093
1873-4812
DOI:10.1016/s0022-3093(01)00478-1