The rhombohedral perovskite composite 0.9Pb(Zr0.5Ti0.5)O3-xPb(Mn 1/3 Nb 2/3)O3-(0.1-x)Pb(Sb 1/2 Nb 1/2)O3, x = 0.05; 0.06; 0.07; 0.08; 0.09; 0.1 (PZT-PMnN-PSbN) was synthesized by the Columbite precursor route. The temperature dependence of dielectric constant and its loss in a frequency region of 0.1 kHz-500 kHz was measured in aim to search the weakfield dielectric response in PZT-PMnN-PSbN systems. A highest value of εmax ¿ 20000 was found at 1 kHz with the temperature Tm of around 575K. Using an extended Curie-Weiss law the diffuse phase transition was determined. Fitting by using Vogel-Fulcher and power relationship indicated that the polarization fluctuation above the static freezing temperature behaved like as a spin-glass one. Cole-Cole analyses showed the non-Debye type relaxation in the system studied.
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