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The chemical transformation of the trihydrate hafnium tetrafluoride crystal has been studied with varying temperature using the time-differential perturbed angular correlation technique. The 133 - 482 keV γ -γ cascade of  181 Ta after the β   −  -decay of 181Hf has been selected and a four detector BaF 2- BaF 2  coincidence set up has been used for measurements. The crystal was produced by evaporating a solution of HfF 6  2  − complex in HF at room temperature. Contrary to the earlier report, it has been found that the trihydrate hafnium tetrafluoride compound dehydrates directly to HfF 4  without producing any intermediate monohydrate and present results do not support the earlier idea that two water molecules of HfF 4  · 3H 2 O are loosely bound. Present investigations exhibit a superheated state for the hafnium tetrafluoride crystal. In dehydrated HfF 4 , two different Hf sites have been observed which suggests two different structures for the anhydrous HfF 4 .

Chemical Transformation of Crystalline Hafnium Tetrafluoride Studied by Perturbed Angular Correlation Spectroscopy