By Anatoly Agulyansky
Digital, optical, mechanical and scientific home equipment are only a couple of examples of recent purposes that use tantalum and niobium. In Chemistry of Tantalum and Niobium Fluoride Compounds, the writer attracts on thirty years' event to provide the 1st ever monograph to systemize and summarize the knowledge on hand on tantalum and niobium fluoride compounds. This complete reference resource bargains a wealthy number of learn technique and is worthy to researchers studying the chemistry of fluorides, in addition to lecturers and scholars in chemistry and metallurgy. * Collects the newest examine at the chemistry of advanced fluorides and oxyfluorides of Tantalum and Niobium.* Covers either thought and alertness of Tantalum and Niobium Fluoride Chemistry* is appropriate for tantalum and niobium manufacturers, researchers learning the chemistry of fluorides, in addition to lecturers and scholars in chemistry and metallurgy
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Extra resources for Chemistry of Tantalum and Niobium Fluoride Compounds
Kalinnikov, Zh. Neorg. Khim. 34 (1989) 3046, Copyright 1989, with permission of "Nauka" (Russian Academy of Sciences) publishing. 60; N a - 1 . 74; N a - 0 . 37; K - 0 . 47 Cs2TaF7 CsF Na2TaF7H2O 18 Synthesis ofTa and Nb fluorides Table 5. Compounds precipitated from niobium-containing solutions Reproduced from , D. V. Tsikaeva, A. I. Agulyansky, Y. I. Balabanov, V. Y. Kuznetsov, V. T. Kalinnikov, Zh. Neorg. Khim. 34 (1989) 3046, Copyright 1989, with permission of'Nauka" (Russian Academy of Sciences) publishing.
Revealed the presence of NbF6" and NbF72" complexes . Anhydrous hydrogen fluoride is widely used for the synthesis of fluoride compounds . In particular, NaNbF 6 and Na2NbF7 were prepared using a solution of anhydrous hydrogen fluoride, HF, containing dissolved NbF 5 and NaF . Another anhydrous solvent that is frequently used for the synthesis of tantalum and niobium fluoride compounds is bromine trifluoride, BrF3. 84 g/cm3 at melting temperature. 24 Synthesis ofTa and Nb fluorides In its liquid form, bromine trifluoride dissociates according to Equation (6): 2 BrF3 = BrF2+ + BrF4" (6) In solvents of this kind, compounds that are formed with F-donors possess alkaline properties, whereas compounds affiliated with F-acceptors take on acidic properties.
Other strong effects, seen at higher temperatures in the range of 220350°C, are related to the decomposition of ammonium fluorotantalates with different stoichiometries. These effects are accompanied by the release of 42 Synthesis ofTa and Nb fluorides Fig. 14. DTA patterns of mixtures: Ta2O5 - NH4HF2 (1); LiTaO3 - NH4HF2 (2) and LiF - Ta2O5 - NH4HF2 (3). Reproduced from , V. T. Kalinnikov, Y. I. Balabanov, L. A. Agulyansky, A. I. Agulyansky, Y. A. Serebryakov, Zh. Obschei. Khim. 54 (1984) 1929, Copyright 1984, with permission of "Nauka" (Russian Academy of Sciences) publishing.
Chemistry of Tantalum and Niobium Fluoride Compounds by Anatoly Agulyansky