High Quality Content by WIKIPEDIA articles! There are several methods available for the synthesis of tantalum oxide. One method involves isolating tantalum pentoxide by crushing a concentrate of the mineral columbite-tantalite and fusing the powdered mineral with sodium hydroxide to give a slurry of mixed insoluble niobic and tantalic acids. The mixed acids are dissolved by passing anhydrous hydrofluoric acid into the slurry and adding the stoichiometric quantity of potassium fluoride to yield a salt. The salts can be separated by a liquid-liquid extraction process, using various ketones as the liquids. (FeMn)(NbTa)2O6 + 6NaOH ? Ta2O5*7H2O + Nb2O5*7H2O 1/2 Ta2O5*7H2O + 1/2 Nb2O5*7H2O + 16KF ? K2TaF7 + K2NbF7 + 2HF + 12KOH Or, 1/2 Ta2O5 + 1/2 Nb2O5 + 4KF + 10HF ? K2TaF7 + K2NbF7 + 5H2O Once K2TaF7 has been isolated, Ta can be extracted by the electrolysis of molten K2TaF7. This pure form of tantalum is then exposed to oxygen at temperatures above 1000 degrees Celsius, to form Ta2O5. It can also be synthesized by hydrolysis of its alkoxide: 2 Ta(OCH2CH3)5 + 5 H2O ? Ta2O5 + 10 HOCH2CH3

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