Summary
This paper details the work on a new class of compounds called the tartratoniobate. In an intensive investigation on the alkali niobates, some earlier data on the lithium niobates have been contradicted. Two new niobates 2viz., 3 K2O.4Nb2O5. 20 H2O and 4 Li2O.3 Nb2O5.15 H2O have been isolated. The reaction of tartaric acid on several niobates of lithium sodium and potassium has been studied in detail and has resulted in the following tartratoniobates; Li2O.Nb2O5.(C4H4O5)2.8 H2O Na2O.Nb2O5. (C4H4O5)2.nH2O and K2O.Nb2O5.(C4H4O5)2.n H2O (n=6 or 10). The properties of each of these compounds have been studied in detail and the difficulty in crystallisation and anomalous solubility have been adequately explained. Dehydration has been conducted in air and in vacuum. A heteropoly acid structure has been assigned to the tartratoniobates.
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(Communicated by Sir C. V. Raman)
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Srinivasan, N.R. Studies on niobium and tantalum. Proc. Indian Acad. Sci. (Math. Sci.) 31, 300–316 (1950). https://doi.org/10.1007/BF03050104
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DOI: https://doi.org/10.1007/BF03050104