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34:. The similar reactivity of niobium and tantalum complicated preparation of pure samples of the metals and therefore several new elements were proposed, which were later found to be mixtures of niobium and tantalum.
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Although it had been proven that ilmenium is only a mixture of niobium and tantalum, Hermann continued publishing articles on ilmenium for several years.
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The differences between tantalum and niobium, and the fact that no other similar element was present, were unequivocally demonstrated in 1864 by
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The
Chemical Gazette, Or, Journal of Practical Chemistry, in All Its Applications to Pharmacy, Arts and Manufactures, Volume 4
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Marignac, Blomstrand, H. Deville, L. Troost und R. Hermann (1866). "Tantalsäure, Niobsäure, (Ilmensäure) und Titansäure".
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was the proposed name for a new element found by the chemist R. Hermann in 1847. During the analysis of the mineral
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Hermann, R. (1871). "Ueber ein einfaches
Verfahren zur Trennung der Säuren des Niobiums von denen des Ilmeniums".
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221:: 344–348.
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