Ammonolysis of niobium(V) bromide
Niobium nitrides and carbonitrides are materials with desirable properties such as hardness, thermal stability, and particularly, in the case of cubic forms, superconductivity. The ammonolysis of niobium halides provides a synthetic route to the nitride. This has been previously examined by Fowles and Pollard, who found, through tensimetric determinations, that the initial ammonolytic reaction leads to the ammonia-soluble derivative NbCl/sub 3/(NH/sub 2/)/sub 2/. Evaporation of the ammonia left a solid residue that, upon thermal treatment, produced NbN. Additional work by Allbutt and Fowles showed that long-term ammonolysis leads to an insoluble residue having a formula corresponding to NbBr(NH/sub 2/)/sub 2/NH. (The structure of a similar tantalum analogue has been recently established.) More recent developments in this area include the work of Sinitsyna, who performed dry ammonolysis reactions between the niobium halides and an excess of the corresponding ammonium halide to produce niobium halide nitrides, NbNX/sub 2/. Finally, Grebtsova et al. studied the thermal conversion of the ammonolysis residue of NbCl/sub 5/ into NbN by a variety of techniques. The present work was undertaken to better characterize the ammonolytic intermediates as well as the thermal decomposition products and also to explore the use of these intermediates in the preparation of derivatives that could be converted into carbonitrides similar to previous work in the titanium system.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6802926
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 26:9; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Properties of Nitrides Prepared by the Ammonolysis of Magnesiothermic Niobium Powders
Use of ammonolytic intermediates for the synthesis of nitrides and carbonitrides
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMMONOLYSIS
BROMIDES
BROMINE COMPOUNDS
CARBONITRIDES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MASS SPECTRA
MEDIUM TEMPERATURE
NIOBIUM BROMIDES
NIOBIUM COMPOUNDS
NITROGEN COMPOUNDS
NUMERICAL DATA
PYROLYSIS
REACTION INTERMEDIATES
REFRACTORY METAL COMPOUNDS
SOLVOLYSIS
SPECTRA
SUPERCONDUCTORS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YIELDS