Abstract
Near-infrared Fourier transform Raman spectroscopy has been used to study the molecular group dynamics in (NH 4) 4H 2(SeO 4) 3 single crystal in the vicinity of its superionic phase transition ( T s ⋍ 378 K ). A change in the dynamics of SeO 4 and SeO 4H entities begins about 15 K below T s and ends at T s. The results of the Raman studies of (NH 4) 4H 2(SeO 4) 3 gave evidence that the orientational disorder of SeO 4 tetrahedra is responsible for the fast protonic conductivity. A very large temperature hysteresis (∼ 30 K) for the superionic phase transition in (NH 4) 4H 2(SeO 4) 3 was found.
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