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CAS 7440-25-7
EINECS/EILINCS/NLP LPVC3422
IUCLID 215-180-8
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A selection of articles related to Tantalum - History. - Many contemporary chemists believed niobium and tantalum were the same elements until 1844 and later 1866 when researchers showed that niobic and tantalic acids were different compounds. - Tantalum-History: Encyclopedia-JiangxiJiangxi Chinese Hanyu Pinyin: Jingx;Wade-Giles: Chiang-hsi;Postal System Pinyin: Kiangsi is a southern province of the People's Republic of China, spanning from the banks of the Yangtze River in the north into hillier areas in the south.
Rose found two new elements in a sample of "columbite" from Bodenmais. One of them was similar to the Ekeberg's tantalum. The other was called "niobium in honor to Niobe, mythological daughter of Tantalus and goddess of the tears. The difference between tantalum and niobium was unequivocally made by Sainte-Claire Deville and by Troost, who determined the formulas of some of its compounds. The Hatchett's columbium was probably a mixture of these two elements, although the term has been used to refer to niobium.
There was no dispute concerning his conclusion until Heinrich Rose, in 1844, was able to distinguish these two elements by their differences in valence state, with columbium exhibiting +3 and +5 states and tantalum only +5 as stable entities. - The chemical similarities of the oxides of these two elements made it very difficult for the chemists of that time to separate them. Marignac developed a procedure in 1866 to achieve their separation via the use of potassium double fluoride salts of tantalum and niobium.
The first relatively pure samples of tantalum were first produced in 1907 Today, tantalum is primarily obtained from the minerals columbite Fe, Mn, MgNb, Ta2O6, tantalite Fe, MnTa, Nb2O6 and euxenite Y, Ca, Er, La, Ce, U, ThNb, Ta, Ti2O6 Tantalum is a strong, ductile metal that is nearly immune to chemical attack at room temperatures. It can be drawn into a fine wire that is used to evaporate metals, such as aluminum. It has a high melting point and is frequently used as a substitute for platinum, which is more expensive.
Tantalum/tæntlm/TAN-tl-m;previously known as tantalium is a chemical element with the symbol Ta and atomic number 73 A rare, hard, blue-gray, lustrous transition metal, tantalum is highly corrosion resistant and occurs naturally in the mineral tantalite, always together with the chemically similar niobium. It is part of the refractory metals group, which are widely used as minor component in alloys. - 4 After Friedrich Wöhler confirmed these results, it was thought that columbium and tantalum were the same element.
It is almost immune to chemical attack at temperatures below 150 C. Tantalum is virtually resistant to corrosion due to an oxide film on its surface. - Tantalum finds use in four areas: high-temperature applications, such as aircraft engines;electrical devices, such as capacitors;sirurgical impants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle. - Only tiny amounts of tantalum are taken by plants: the amount in vegetation rarely exceeds 5 ppb.
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