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Anomaly of the Raman Linewidth of the Internal v2 Mode near the Phase Transition Point of K3D(SO4)2
- The linewidth of the internal mode ν 2 of SO 4 2- ion of the antiferroelectric K 3 D(SO 4 ) 2 shows the anomalous broadening with lowering temperature near the phase transition point. The broadening is well explained by a mechanism resembling the motional narrowing phenomenon in the nuclear magnetic resonance theory. The characteristic time of the motion of deuteron in a hydrogen bond is estimated to be on the order of 10 -13 s.