Preparation and characterization of niobium carbide and carbonitride
Journal Article
·
· Journal of Solid State Chemistry
- Sun Moon Univ., Chung Nam (Korea, Republic of). Div. of Chemical Engineering
- Univ. P. and M. Curie, Paris (France). Lab. Reactivite de Surface
Unsupported niobium carbide powders of NbC were prepared by carburization of commercial niobium pentoxide in flowing CH{sub 4}-H{sub 2} mixtures. Several routes of synthesis were investigated, leading to final carbides with specific surface areas ranging from 10 to 50 m{sup 2} g{sup {minus}1}. During direct carburization, after the first step of reduction of Nb{sub 2}O{sub 5} to NbO{sub 2}, a long induction period which was succeeded by an acceleratory period, was observed for the reduction/carburization to NbC. In the presence of a catalyst of methane decomposition, this induction period was eliminated but the superficial carbon free contamination of the final carbide was increased. However, this contamination can be removed by a reducing treatment and CO chemisorption can be observed. The preparations through niobium oxynitride lead to face-centered cubic carbonitrides with specific surface areas ranging from 27 to 49 m{sup 2}g{sup {minus}1}. Chemical composition and cell parameter of these carbonitrides vary slightly with the synthesis conditions. After a reducing treatment, as for NbC, CO chemisorption was also observed.
- OSTI ID:
- 329126
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 142; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis of niobium carbide from niobium oxide aerogels
Niobium carbide synthesis from niobium oxide: Study of the synthesis conditions, kinetics, and solid-state transformation mechanism
Formation of niobium carbonitride from Nb$sub 2$O$sub 5$ and graphite in a plasma arc
Journal Article
·
Sat Dec 31 23:00:00 EST 1994
· Chemistry of Materials
·
OSTI ID:535301
Niobium carbide synthesis from niobium oxide: Study of the synthesis conditions, kinetics, and solid-state transformation mechanism
Journal Article
·
Sun Mar 31 23:00:00 EST 1996
· Journal of Solid State Chemistry
·
OSTI ID:274263
Formation of niobium carbonitride from Nb$sub 2$O$sub 5$ and graphite in a plasma arc
Journal Article
·
Mon Sep 01 00:00:00 EDT 1975
· High Temp. Sci., v. 7, no. 3, pp. 167-172
·
OSTI ID:4179914