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在ＫＤＰ、ＴＧＳ中，Ｔｃ附近分别观测到两个内耗（Ｑ－１）和介电损耗（Ｄ）峰，在ＬＮＰＰ中观测到相应的两个内耗峰，Ｐ１峰起源于二级相变的涨落效应，而Ｐ２与畴有关．考虑到Ｔｃ附近序参量以及由之而引起的畴界密度和畴界运动的粘滞系数随温度的显著变化，计算了与畴界运动有关的内耗和介电损耗，并和实验结果进行了比较．在弛豫铁电体ＰＭＮ—ＰＴ中，Ｔｃ以下也观测到相应于Ｐ２峰的内耗和介电损耗峰，考虑到畴界运动和其它一些因素，对该峰进行了讨论
In KDP and TGS, two internal friction (Q-1) and dielectric loss (D) peaks were observed in the vicinity of Tc. Two corresponding internal friction peaks were observed in LNPP. The P1 peak originated in the secondary phase transition Fall effect, and P2 and the domain. Considering the order parameter in the vicinity of Tc and the resulting viscosities of the domain densities and domain motions with temperature, the internal and dielectric losses associated with domain motions are calculated and compared with the experimental results . In the relaxation ferroelectric PMN-PT, the internal and dielectric loss peaks corresponding to the P2 peak are also observed below Tc, and the peak is considered in view of the boundary motion and other factors