Abstract
Two internal friction ( Q −1) and dielectric ( D) peaks (P 1, P 2) for potassium dihydrogen phosphate, triglycine sulfate and two Q −1 peaks for La 1-χNd χP 5O 14 were investigated. P 1 is attributed to fluctuations near a second-order phase transition and P 2 is related to domain walls (DWs). Taking into account the temperature dependence of the density and the viscosity of DWs as well as the order parameter, and the interaction between DWs, Q −1 and D due to the viscous motion of DWs were calculated and compared with the experimental data for the kilohertz range. Q −1 and D peaks were also measured in the relaxor ferroelectric 0.8Pb(Mg 1/3Nb 2/3)O 3-0.2PbTiO 3 for various frequencies. A qualitative analysis based on DWs and other factors for the peak is suggested.
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