Vibrational spectra of niobium and tantalum complexes in hydrofluoric acid

Journal Article · Tue Oct 20 04:00:00 EDT 1987 · J. Gen. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:7007433

Tsikaeva, D V; Nikitina, S D; Agulyanskii, A I; Kalinnikov, V T

Niobium and tantalum compounds are widely used in special materials as well as in the electrolytic production of the metals and of alloys and metallic coatings. One method of making niobium and tantalum fluorides and oxyfluorides is precipitation from solution in hydrofluoric acid. Here the authors examine the Raman and IR spectra of hydrofluoric acid containing these elements over wide concentration ranges in the acid and metal. IR and RS data indicate that hydrofluoric acid containing tantalum at concentration levels of 1.52-6.9 M Ta and 9.24-40.4 M HF contain TaF/sub 6//sup -/ and TaF/sub 7//sup 2 -/. Dilution increases the number of TaF/sub 7//sup 2 -/ ions, and a line at 674 cm/sup -1/, which is difficult to interpret, appears in the Raman spectrum. Hydrofluoric acid containing niobium at concentrations of 1.54-7.0 M Nb and 9.75-42.6 M HF contain NbF/sub 6//sup -/ and NbOF/sub 5//sup 2 -/.

• Research Organization: Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Apatity (USSR)
• OSTI ID: 7007433
• Journal Information: J. Gen. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Gen. Chem. USSR (Engl. Transl.); (United States) Vol. 57:5; ISSN JGCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPLEXES
COMPLEXOMETRY
DECOMPOSITION
ENERGY LEVELS
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
HELIUM-NEON LASERS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
HYDROLYSIS
INFRARED SPECTRA
INORGANIC ACIDS
LASERS
LINE WIDTHS
LYSIS
NIOBIUM COMPLEXES
NIOBIUM COMPOUNDS
NIOBIUM FLUORIDES
OXYFLUORIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RAMAN SPECTRA
REFRACTORY METAL COMPOUNDS
SOLVATION
SOLVOLYSIS
SPECTRA
TANTALUM COMPLEXES
TANTALUM COMPOUNDS
TANTALUM FLUORIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VIBRATIONAL STATES