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The comparison between the theory (solid lines) and the experimental data (symbols) in the temperature dependent dielectric losses for various ferroelectrics. The temperature dependence of the density and the viscosity of domain walls, the order parameter and the interaction among domain walls were taken into account in the theory, which was proposed by Y.N. Huang and co-workers. Adapted from Refs. [138, 246, 248, 250, 256].
