Dielectric behavior of electroactive fluorinate-based terpolymers

Ang, Chen; Yu, Zhi
March 2004
Applied Physics Letters;3/22/2004, Vol. 84 Issue 12, p2145
Academic Journal
The dielectric and ferroelectric properties of the poly(vinylidene fluoride–trifluoroethylene–chlorotrifluoroethylene) terpolymers are studied in the temperature range 160–380 K. More attention was given to the dielectric loss in the dielectric spectra and the following results were obtained: (1) there are two dielectric polarization mechanisms, modes A and B, contributing to the majority of the dielectric permittivity; (2) by using the Cole–Cole plot method, precise relaxation rates of mode B can be obtained, which follow the Vogel–Fulcher relation with reasonable parameters, T[sub VF]=∼160±2 K, U[sub VF]=∼0.16±0.01 eV, ν[sub 0]=1×10[sup 12] Hz. The temperature where mode A occurs does not shift with the variation of frequency and a well-developed hysteresis loop is observed, indicating the existence of a normal “paraelectric–ferroelectric” transition in the terpolymer. © 2004 American Institute of Physics.


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