By Anatoly Agulyansky
ISBN-10: 0444516042
ISBN-13: 9780444516046
Digital, optical, mechanical and scientific home equipment are only a couple of examples of contemporary functions that use tantalum and niobium. In Chemistry of Tantalum and Niobium Fluoride Compounds , the writer attracts on thirty years' adventure to provide the 1st ever monograph to systemize and summarize the information on hand on tantalum and niobium fluoride compounds. This complete reference resource bargains a wealthy number of learn method and is useful to researchers studying the chemistry of fluorides, in addition to lecturers and scholars in chemistry and metallurgy. * Collects the newest study at the chemistry of complicated fluorides and oxyfluorides of Tantalum and Niobium. * Covers either conception and alertness of Tantalum and Niobium Fluoride Chemistry * is acceptable 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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Additional info for The chemistry of tantalum and niobium fluoride compounds
Example text
In this case, one of the cations must have a coordination number of 4, which is highly improbable. Another possible way of stabilizing the compound is to crystallize it as a Galasso salt [88]. In this case, however, lithium's coordination number must increase, which is atypical for lithium cations. Analysis of weight loss isotherms displayed in Fig. 8 shows that the first step in the interaction between NbO2F and carbonates of other alkali metals is similar to the interaction described by Equation (11).
9), the passivating compound is Li4NbO4F. The probable formation of M4MeO4F during the first stage of the interaction with alkali metal carbonates is typical for other types of fluoride compounds containing niobium and tantalum. Li4Ta04F was also found during the investigation of the Li2CO3 - LiTaF6 system. The melting diagram of the system is shown in Fig. 13. The interaction yielding Li4Ta04F can be described by the following scheme: LiTaF6 + 4Li2CO3 = Li4Ta04F + 5 LiF + 4 CO2 (24) Summarizing the above results, the following peculiarities of the interactions of niobium and tantalum compounds with alkali metal carbonates can be mentioned: Alkali metal carbonates interact in molten form; The interaction takes place as a single-stage process; The results of the interaction is a compound incapable of any further interaction with the carbonate; In the case of oxyfluorides, M4Me04F compounds are formed; In the case of pure oxides, M3Me04 compounds are formed.
In the Li2CO3 - NbO2F system (Fig. 9), the passivating compound is Li4NbO4F. The probable formation of M4MeO4F during the first stage of the interaction with alkali metal carbonates is typical for other types of fluoride compounds containing niobium and tantalum. Li4Ta04F was also found during the investigation of the Li2CO3 - LiTaF6 system. The melting diagram of the system is shown in Fig. 13. The interaction yielding Li4Ta04F can be described by the following scheme: LiTaF6 + 4Li2CO3 = Li4Ta04F + 5 LiF + 4 CO2 (24) Summarizing the above results, the following peculiarities of the interactions of niobium and tantalum compounds with alkali metal carbonates can be mentioned: Alkali metal carbonates interact in molten form; The interaction takes place as a single-stage process; The results of the interaction is a compound incapable of any further interaction with the carbonate; In the case of oxyfluorides, M4Me04F compounds are formed; In the case of pure oxides, M3Me04 compounds are formed.
The chemistry of tantalum and niobium fluoride compounds by Anatoly Agulyansky
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