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The fluorination of scheelite by ammonium bifluoride

✍ Scribed by N.M. Laptash; E.I. Melnichenko; S.A. Polyshchuk

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
34 KB
Volume
54
Category
Article
ISSN
0022-1139

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✦ Synopsis

The interaction of scheelite with ammonium bifluoride is studied. It was shown that the scheelite reacts with Kfi4HF2 at room temperature in contrast to tungstic oxide and other tungsten compounds. Two complexes are formed: (l.H4)3,+'03F3 and new ;1,H4)2ii03F2. The compounds obtained are light fluorinated (endothermic peaks at 173 and 90Β°C correspondingly).

The cubic monocrystals of (hH4)j802F5 was obtained. The cubic form is nonstable and revealed in time a lattice transformation at room temperature to more stable tetragonal form. The last one turn reversible into cubic form at 14O'C.

The thermal decomposition of (I;H4)2;10jF2 is studied.

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