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Abstract
The dielectric behavior in the first and the second order phase transitions between paraelectric SmA and antiferroelectric SmC*A has been explored using three substances having trifluoromethyl group. The soft mode contribution to the dielectric constants was easily obtained in both phases having no spontaneous polarization. The temperature dependences of the inverse dielectric strength 1/Δe, determined by the Cole-Cole plot clearly reveal the variety of the transition order such as the first-order and the second-order phase transition. The temperature dependences of the relaxation frequency also show the characteristics of these transition order.