Chemistry of Tantalum and Niobium Fluoride Compounds by Anatoly Agulyansky

By Anatoly Agulyansky

Digital, optical, mechanical and scientific home equipment are only a number 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 to be had on tantalum and niobium fluoride compounds. This entire reference resource deals a wealthy number of learn technique and is important to researchers interpreting the chemistry of fluorides, in addition to academics and scholars in chemistry and metallurgy. * Collects the most recent learn 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 academics and scholars in chemistry and metallurgy

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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. In all cases discussed here, components interact yielding the same intermediate compound, M4MeO4F, where M = alkali metal, Me - tantalum or niobium.

At Synthesis ofTa and Nb fluorides 33 the same time, increasing the thermal treatment temperature in the range of 780-850°C leads to a significant increase in the LiTaO3 concentration in the treated mixture. In the light of the above, the main interactions can be described as follows [90]: 2Li 2 CO 3 + TaO2F = Li4TaO4F + 2 CO2 (19) In the systems containing sodium or potassium carbonates found no M 4 Ta0 4 F type compounds were found (M = Na, K). A phase with a composition similar to that of sodium metatantalate was identified in a 2:1 (molar ratio) mixture of Na 2 CO 3 and TaO2F.

The maximum pressure corresponds to a temperature of about 600-610°C, which is in good correlation with DTA data. In the case of interactions that take place in M2CO3 - MeO2F systems (M = alkali metal, Me = Nb or Ta), the compound M 4 Me0 4 F is not stable if M = Na, K, Rb or Cs. Li4MeO4F is stable but it seems that the compound quickly dissolves in the melt. Thus, in both cases no passivation of the surface of the solid components takes place. A different situation is observed in the case of the interaction between lithium carbonate and tantalum- or niobium oxide.

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