By Anatoly Agulyansky
Digital, optical, mechanical and clinical 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' adventure to provide the 1st ever monograph to systemize and summarize the information on hand on tantalum and niobium fluoride compounds. This accomplished reference resource bargains a wealthy number of learn method and is valuable to researchers interpreting the chemistry of fluorides, in addition to academics and scholars in chemistry and metallurgy. * Collects the newest examine at the chemistry of complicated fluorides and oxyfluorides of Tantalum and Niobium.* Covers either thought and alertness of Tantalum and Niobium Fluoride Chemistry* is acceptable for tantalum and niobium manufacturers, researchers learning the chemistry of fluorides, in addition to academics and scholars in chemistry and metallurgy
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Extra info for Chemistry of Tantalum and Niobium Fluoride Compounds
As a result of the interaction the mixture of MgF2 and TaO2F were found out after performing of the process . This inability to obtain magnesium fluorotantalates is related to the poor thermal stability of the compounds due to the similarity between the ionic radii of magnesium and tantalum. Analogous niobium-containing compounds, MNbF7, are known and have been investigated, in which M = Mg, Ca, Mn, Fe, Co, Ni, Zn, Cd , but they are not exactly typical island-type complexes. MNbF7 crystallizes in a manner similar to MNbF6, with a seventh fluorine atom positioned between specific sites in the lattice of a ReO3-type crystal.
The above-mentioned data clearly indicate that the first step in the interaction between NbO2F and alkali metal carbonates takes place at a molar ratio of 1:2. In the case of lithium carbonate, Li4NbO4F is obtained according to above Equation (11). A subsequent increase in the concentration of NbO 2 F in the lithium carbonate mixture leads to the formation of lithium metaniobate, LiNbO3. The mechanism of LiNbO3 formation can be represented by a twostep reaction. The first step consists of the formation of an intermediate compound according to the following equation: Li4NbO4F + NbO2F = 2 Li2NbO3F (12) The product of the interaction (12), Li2NbO3F, is unstable and decomposes as follows: Li2NbO3F = LiNbO3 + LiF (13) The instability of Li 2 Nb0 3 F can be explained based on the 4:3 anionxation ratio.
The main phases formed in M2O (M2CO3) - TaO2F systems in which M = Li, Na, K, are listed in Table 11. 34 Synthesis ofTa and Nb fluorides Table 11. 3. Interaction mechanism in systems containing carbonates Determining the stoichiometry of a reaction's first step and the composition of the reaction's first product is a key point in the definition of heterogeneous processes. The most fundamental feature of the different interactions that take place in systems containing alkali metal carbonates is their similar mechanism.