THE PREPARATION OF SOME MIXED HALOGENIDES OF NIOBIUM AND TANTALUM

Journal Article · Mon Jul 21 04:00:00 EDT 1958 · Compt. rend.

OSTI ID:4299247

Chaigneau, M

The preparation of the mixed halides of niobium and of tantalum was studied. Niobium pentoxide was heated with aluminum bromide and aluminum iodide in proportions of 1 mole of bromide for 2 moles of iodide and also in the reverse proportions at 230 deg C for 24 hours. The only compound formed was isolated by sublimation in a vacuum at 350 deg C. It was a black acicular crystal with a density of 4.68 at 18 deg C and had the formula NbBrI/sub 2/. Tantalum pentoxide heated with one mole of AlI/sub 3/ and two moles of AlBr/sub 3/ at 230 deg C for 48 hours gave a black crystal which could be separated by sublimation at 350 deg C in the form of triangular tables with mordore reflections presenting in some places efflorescences. The density is 5.47 at 18 deg C and the formula is TaBr/ sub 4/I. If the pentoxide is heated with one mole of AlBr/sub 3/ and two moles of AlI/sub 3/, a dark brown crystal is formed with a density of 5.55 at 18 deg C. Its formula is TaBrI/sub 4/. The mixed halides are instable in air and are attacked by water, ammonia, and dilute acids. Niobium bromoiodide is insoluble in the usual organic solvents. Tantalum bromoiodides are insoluble in ether, carbon sulfide, and carbon tetrachloride, but are soluble in acetone, ethyl and methyl alcohols, dioxane, and glycerine. (J.S.R.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-12-016200
• OSTI ID: 4299247
• Journal Information: Compt. rend., Journal Name: Compt. rend. Vol. Vol: 247
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

ACIDS
AIR
ALUMINUM BROMIDES
ALUMINUM IODIDES
AMMONIA
CHEMICAL REACTIONS
CHEMISTRY
CONFIGURATION
CRYSTALS
DENSITY
EVAPORATION
HALIDES
MIXING
NIOBIUM BROMIDES
NIOBIUM COMPOUNDS
NIOBIUM IODIDES
NIOBIUM OXIDES
ORGANIC COMPOUNDS
PREPARATION
SOLUBILITY
SOLVENTS
STABILITY
TANTALUM BROMIDES
TANTALUM COMPOUNDS
TANTALUM IODIDES
TANTALUM OXIDES
VACUUM
WATER