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Tellurium Oxyfluorides

The distant resemblance of tellurium to the metalloid antimony, its neighbour in Group VB, extends to the formation of oxyhalides or basic halides. The system TeO2HFH2O has been investigated at 10° C. and a number of crystalline hydrated oxyfluorides obtained either by slow evaporation of solutions of tellurium dioxide or tellurous acid in nearly 100 per cent, hydrofluoric acid, or by evaporation in a vacuum over concentrated sulphuric acid of solutions in 40 to 55 per cent, hydrofluoric acid. The monohydrate, TeF4.TeO2.H2O, was generally obtained in the form of rosettes of transparent needles; the dihydrate, TeF4.TeO2.2H2O, sometimes separated in this form and sometimes as hard milk-white nodules of radiating crystals. An oxyfluoride of composition 2TeF4.3TeO2 was also isolated both in the anhydrous condition and as a hydrate containing 6H2O.

The exact nature of the oxyfluorides described has not yet been determined, but for the monohydrate there is evidence in favour of the formula 2TeOF2.H2O.

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