Abstract
The internal friction in potassium dihydrogen phosphate (KDP) crystal and the dielectric loss in KDP and triglycine sulfate (TGS) crystals are measured near T c in the kHz frequency range. An internal-friction peak (P M2 ) and a dielectric loss peak (P D2 ) appear at about several degrees below T c , which are found to be associated with the viscous movement of domain walls
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